Page 1 6F8A0917 Electromagnetic Flowmeter Converter LF232 Type INSTRUCTION MANUAL NOTES Before using the equipment, please read this manual carefully and understand the contents, and then use the equipment correctly. • NEVER attempt to operate the equipment in any ways that are not described in this instruction manual.
Page 2 After reading this manual, store it in a place where it can be referred to whenever needed. Toshiba LF232 electromagnetic flowmeter converters can be used in combination with various types of electromagnetic flowmeter detectors. For the notes on usage, piping, installation, configuration and maintenance of the combined detector, check the model number of the combined detector and read the instruction manual of the relevant detector.
Page 3: Safety Precautions
6F8A0917 SAFETY PRECAUTIONS Safety signs and labels affixed to the product and/or described in this manual give important information for using the product safely. They help prevent damage to property and obviate hazards for persons using the product. Make yourself familiar with signal words and symbols used for safety signs and labels. Then read the safety precautions that follow to prevent an accident involving personal injury, death or damage to property.
Page 4 6F8A0917 SAFETY PRECAUTIONS (continued) Safety Precautions for Installation and Wiring Do not use the LF232 in an explosive Use an appropriate device to carry and install atmosphere. the LF232. If this product falls to the ground, Using this product in an explosive injury, or malfunction of or damage atmosphere can cause explosion.
Page 5 Warranty and Limitation of Liability Toshiba does not accept liability for any damage or loss, material or personal, caused as a direct or indirect result of the operation of this product in connection with, or due to, the occurrence of any event of force majeure (including fire or earthquake) or the misuse of this product, whether intentional or accidental.
Page 6: Handling Precautions
6F8A0917 Handling Precautions To obtain the optimum performance from the LF232 converter for years of continuous operation, observe the following precautions. (1) Do not store or install the flowmeter in: • Places where there is direct sunlight. If this is unavoidable, use an appropriate sunshade. If the control keys (infrared switches) are exposed to direct sunlight, they may not function correctly.
Page 7 6F8A0917 Handling Precautions (continued) (6) The converter housing covers and the cable connections are tightened securely at the time of shipment. Do not remove these covers or connections unless it is necessary to wire new cables or replace old ones. Otherwise, gradual deterioration of circuit isolation or damage to this product can be caused.
Page 8: Table Of Contents
6F8A0917 Table of Contents Product Inspection and Storage ···················································································10 Product Inspection······································································································10 Storage ·······················································································································10 Overview ···························································································································· 11 Names of Parts ·················································································································12 Installation ·························································································································15 Cautionary Notes on Selecting the Installation Location ············································16 How to Install the Converter ·······················································································17 Wiring ··································································································································19 Installation Cables ······································································································20 External Connections ·································································································21 Cautionary Notes on Wiring························································································22 5.3.1...
Page 9 6F8A0917 Parameter Settings / Adjustment ·················································································55 Parameter Setting Items·····························································································55 Parameters Check / Change ······················································································56 8.2.1 Exciting Current Value ···················································································56 8.2.2 Meter Size ·····································································································58 8.2.3 Exciting Frequency ························································································60 8.2.4 Flow Direction································································································62 8.2.5 Password Setting···························································································64 8.2.6 Normal Indicating Unit ···················································································66 8.2.7 Custom Unit···································································································69 8.2.8 Span Value (Range) ·····················································································72 8.2.9...
Page 10 6F8A0917 10.4 Flow Rate High/Low Limit Alarm Output···································································138 10.5 Fluid Empty Alarm Output·························································································141 10.6 Preset Counter Output Function···············································································142 10.7 Remote Still Water Zero Adjustment·········································································146 10.8 Remote Selection of Fixed Value Output··································································147 10.9 Converter Error Alarm Output···················································································148 11. Communications Function ··························································································149 11.1 Connection with the HHT terminal············································································149 11.2 Procedure for Communication with HHT ··································································151 11.3 Cautionary Notes on Communications ·····································································152...
Page 11: Product Inspection And Storage
Is the specification the same as when you placed an order? If you find anything defective and unclear, contact the sales office from which you purchased the product or your nearest Toshiba representative. The capacitor attached for large meter size specification can be used to improve the performance when combining the converter with an old type detector.
Page 12: Overview
6F8A0917 2. Overview The electromagnetic flowmeter is an instrument to measure the volumetric flow rate of conductive fluids using Faraday's law of electromagnetic induction. The flowmeter consists of a detector which generates a signal of electromotive force proportional to the flow rate of the fluid and detects this signal, and a converter which converts the signal detected by the detector to a unified signal output.
Page 13: Names Of Parts
6F8A0917 3. Names of Parts Appearance Mounting plate Display section Operation switch (Infrared switch) Converter cover Converter cover Converter cover mounting screw mounting screw Mounting plate Cable connection (Cap nuts) 5 pieces Appropriate cable outer diameter: 11 to 13mm Material: Nylon resin Material: Nylon resin Cable connection for signal cable Housing side connection: G(PF) 1/2 thread...
Page 14 6F8A0917 Internal structure (with converter cover opened) Display section (LCD) Operation switch (Infrared switch) Fuse holder Power switch Terminal block Protection cover - 13 -...
Page 15 6F8A0917 Terminal block construction The label shown left is placed near the terminal board for power supply on the converter. Be alert to electric shock. 4 20mADC current Fuse holders Detector connection terminals output terminals Power supply terminals Digital I/O terminals Power switch Protection cover Internal ground...
Page 16: Installation
6F8A0917 4. Installation Cautionary notes on installation Do not use the LF232 in an explosive Use an appropriate device to carry and install atmosphere. the LF232. If this product falls to the ground, Using this product in an explosive injury, or malfunction of or damage atmosphere can cause explosion.
Page 17: Cautionary Notes On Selecting The Installation Location
6F8A0917 4.1 Cautionary Notes on Selecting the Installation Location (1) Avoid places within the immediate proximity of the equipment producing interference to measurement (such as motors, transformers, radio transmitters, electrolytic cells, or other equipment causing electromagnetic or electrostatic interference). (2) Avoid places where excessive vibration occurs. (3) Avoid places where there is direct sunlight as mush as possible.
Page 18: How To Install The Converter
6F8A0917 4.2 How to Install the Converter The converter can be mounted on a panel, wall or on a pipe stand. Install the converter so that the front of the converter cover stays vertically straight and the cable ports of the converter stay at the bottom. Figure 4.1 shows an example of panel and wall mounting installation and Figure 4.2 shows an example of pipe stand installation.
Page 19 6F8A0917 Unit: inch (mm) 2.91 (74) M10 U bolt, etc 2” (50A) PIPE Figure 4.2 Example of Pipe Mounting - 18 -...
Page 20: Wiring
6F8A0917 5. Wiring Cautionary notes on wiring urn off mains power before working on pipes. Install a switch and fuse to isolate the LF232 from mains power. Power supply from mains power can Working on pipes while power is cause electric shock or circuit applied can cause electric shock.
Page 21: Installation Cables
6F8A0917 (4) If the converter needs to be installed in a location where watertight installation is required, make unused cable ports watertight. (Be careful that the attached blind plate is used for dustproof purpose and it is not effective for watertight installation.) (5) The converter has a surge arrestor/protector installed inside.
Page 22: External Connections
6F8A0917 5.2 External Connections The external connections of the converter are shown in Figure 5.1. See 5.4 “Wiring Method” to connect the cables correctly Terminal block IV wire 5.5mm or more Power cable (CVV) Power supply Class D grounding (Ground resistance Current output 100 or less) (4 20mADC)
Page 23: Cautionary Notes On Wiring
Before you replace these cables, place an order for packing of the detector terminal box cover as well as packing for the cable connection to Toshiba or Toshiba representative and make sure to replace these packings when you replace the cables.
Page 24: Wiring Method
6F8A0917 5.4 Wiring Method Do not conduct wiring work when power is Do not work on piping and wiring with wet applied. hands. Wet hands may result in electric Wiring while power is applied can cause electric shock. shock. DON’T DON’T 5.4.1 Terminal Treatment of Cables Proceed as follows to treat the terminals at the converter side of the flow rate signal and excitation...
Page 25 6F8A0917 Connecting the input signal cable Strip the sheath from the end of each wire of a 2-core individually shielded cable as shown in Figure 5.3 and attach and crimp an M4 crimping terminal with insulating sleeve to the end of each wire.
Page 26: Cable Connection
6F8A0917 Power cable, current output cable and digital I/O cables Necessary cables should be purchased and prepared by the agent in charge of installation. Strip the sheath from the end of each wire and attach and crimp an M4 crimping terminal with insulated sleeve to the end of each wire.
Page 27 6F8A0917 Referring to 5.2 "External Connections," connect each cable to the terminal block. Tighten the screws of the terminal block tightly to make them securely connected. A loose connection may cause incorrect measurement. After connecting each cable, try to pull it to check whether it has been connected securely.
Page 28: Grounding
6F8A0917 5.4.3 Grounding The external ground terminal of the detector and the FG terminal of the converter (or external ground terminal of the converter) must be grounded securely with Class D grounding (grounding resistance 100Ω or less). Use an IV wire 5.5mm or more for grounding wire.
Page 29 6F8A0917 Converter terminal block External ground terminal Twisting shields Class D grounding (Ground resistance 100 or less) Input signal cable Twisting shields Excitation cable Ground terminal Detector terminal block Figure 5.9 (b) Wiring between Detector and Converter (when grounding for detector is difficult) Conductive material pipe Non-conductive material pipe...
Page 30: Digital I/O Connections
6F8A0917 5.5 Digital I/O Connections Digital I/O terminals consist of four contact output terminals (DO1 to DO4) and two voltage signal input terminals (DI1 and DI2), and each terminal is isolated from internal circuits. The terminal CO2 is the signal common for DO2 to DO4 and the terminal CI is the signal common for DI1 and DI2.
Page 31: Cautionary Notes On Replacing Converter
6F8A0917 5.6 Cautionary Notes on Replacing Converter 5.6.1 Replacing the LF230 Converter The following precautions must be taken to replace the conventional type LF230 with LF232. Installation • Since the hole diameter and pitch for mounting fitting, and the dimensions of the LF232 converter main unit are the same as those of the LF230 converter, it is possible to replace the converter without changing the mounting panel, installation space, etc.
Page 32: Combination With An Existing Detector (For Large Meter Size)
6F8A0917 5.6.2 Combination with an Existing Detector (for Large Meter Size) When the LF232 flowmeter converter (LF232*B for large meter size) is combined with an existing detector of commercial power excitation method, the excitation current may not become stable because of the difference of the excitation method.
Page 33: Replacement Of Partially Filled Pipes Type
6F8A0917 5.6.3 Replacement of partially filled pipes type When detector of partially filled pipes type is replaced from LF502 or LF502(FS2 type) to LF232*F, please be careful to the following points. • Installing In the case of replacement from LF502(FS2 type): The diameter of hole, width of installation metal fittings of LF232, an external size of the body of converter are the same.
Page 34 6F8A0917 • Wirering ・ Hole position of cable connection mouth of LF232* F is the same as LF502 (type FS2). ・ Because specifications of cable connection mouth are different in the following points, Please be careful. Table 5.4 Cable connection mouth specification comparison list (Partially filled pipes type) Model LF502...
Page 35: Operation
6F8A0917 6. Operation Do not touch the LF232 main body when high temperature fluid is being measured. The fluid raises the main body temperature and can cause burns when touched. DON’T For operation, follow the procedure described below. Inspection for each part Is the wiring and connection between the detector and converter correct? Is the wiring between the converter and related instruments correct? Isn’t tightening of connection between the detector and the mating pipe...
Page 36 6F8A0917 Note: If the fluid to be measured is not filled in the detector pipe (When detector is partially filled pipes type, water level is not enough), flow rate becomes inconsistent and measurement cannot be performed correctly. Be sure to use the flowmeter while the fluid to be measured is filled in the detector pipe. - 35 -...
Page 37: Display And Controls
6F8A0917 7. Display and Controls For the LF232 converter, the measured value can be displayed and the parameters can be checked or set using the LCD display and operation switches. The operation switches are non-contact type (infrared method) and can be operated without opening the converter cover (operable also while the cover is opened).
Page 38: Names And Functions Of Display And Controls
6F8A0917 7.1 Names and Functions of Display and Controls Display Operation switch (Infrared switch) Figure 7.2 Display and Controls LCD display A 16-character × 2-line liquid crystal display with backlight is used. Instantaneous flow rate and total flow, and various constants such as parameters can be displayed. In addition, the backlight is always lit and data can be read clearly even in a dark place.
Page 39 6F8A0917 Instructions The operation principle of infrared switch is to irradiate infrared to the front of control panel and detect the reflection from finger when operating. Normal operation is impeded depending on the conditions such as disturbing light from surroundings or stain attached to the control panel. When unable to avoid such condition, operate the EMF converter in the following manner.
Page 40 6F8A0917 Functions of each switch Switch Basic function • Moves the mode from the measurement mode to menu display ENTER 111 (*note) 10.00 m/s 100.0 % (Measurement mode) (Menu lock cancellation screen) • Moves the mode to the setting, calibration or measurement mode A1:EX CURR A1:EX CURR 0.2100A...
Page 41: Display Format
6F8A0917 Note : There is not this screen to the converter before serial No.072320999. ( Menu screen is displayed. Menu lock cancellation screen is not displayed. ) Switch Basic function • Returns the screen from the parameter display screen to the menu display screen.
Page 42 6F8A0917 (2) Total count display 9 9 9 9 9 9 9 9 C “C” is displayed when counting is in progress. Total value is displayed in the unit of count When the count exceeds the maximum value of 99999999, the count will be reset to 0 and will be counted again.
Page 43 6F8A0917 Notes on total flow value display Note 1: The total flow value and the total difference flow value are displayed to the least significant digit of the set count rate. Example: When the set count rate is 0.0001 m Total flow / total difference flow display becomes and the value increases in increments of 0.0001 m...
Page 44: Basic Operations
6F8A0917 (7) Error message / other message display C U R R E N T O P E N If an error or alarm condition occurs, a message is displayed in the 2nd line. (8) Fixed output display * F I X O U T 2 0 .
Page 45 6F8A0917 (2) Mode switching operation flow shown in the flow diagram below indicate the switch CANCEL MENU/ENT operations and when the indicated switch is pressed, the process moves to the item indicated by the corresponding arrow Measurement mode 10.00 m/s 100.0 % Not [111] Press longer...
Page 46 6F8A0917 Note 1: If password is set, the password selection screen appears. For details, see 7.3.3, “Password Input.” Note 2: If no operation is performed for one minute while the mode selection screen or the setting mode menu screen is displayed, the screen returns to the measurement screen Note 3: There is not this screen to the converter before serial No.072320999.
Page 47: Setting Mode Operation
6F8A0917 7.3.2 Setting Mode Operation Proceed as follows to select the desired item and check or change the setting values. * Switch operation indicates the switches to press. Moving to the menu display Switch operation Display example Description 10.00 m/s Measured value being displayed (measurement mode) −...
Page 48 6F8A0917 To return from the menu display to the measurement mode Switch operation Display example Description Set the digit of number for function number to “0” by pressing C0: MEAS MODE (Note2). The digit of letter can be set to any letter. The mode returns to the measurement mode (measured value 10.00 m/s display screen).
Page 49 6F8A0917 Checking or changing the setting values Switch operation Display example Description Menu display Select the desired item to check or change using C2: RANGE 1 C2 (RANGE 1) in this example. Press to decide the item to check or change. MENU/ENT The cursor disappears and the currently set value appears for C2: RANGE 1...
Page 50: Password Input
6F8A0917 7.3.3 Password Input The password function is provided in the LF232 converter to prevent some functions that affect the flow measurement from being used or adjusted. If password is set, totalizer cannot be reset. For the setting menu limited by the password, see 7.4 “Setting Menu List.” In addition, for how to set password, see 8.2.5 “Password Setting.”...
Page 51 6F8A0917 Example of password input (mode selection: SET and password: 123) Switch operation Display example Description The password input screen appears from the measurement mode. The cursor appears. INPUT PASSWORD Pressing , the screen returns to the mode selection CANCEL screen.
Page 52: Totalizer Operation
6F8A0917 7.3.4 Totalizer Operation In the totalizer operation mode, the totalizer can be started, stopped and reset. If password is set (if password input does not match), the totalizer can be started or stopped but it cannot be reset. Note: To operate the totalizer, it is necessary to set necessary settings for the totalizer. For details of how to set necessary settings for the totalizer, see 10.
Page 53 6F8A0917 Example of totalizer operation Switch operation Display example Description 10.00 m/s (Measurement mode) − 100.0% Pressing in the measurement mode for 3 seconds MENU/ENT or more, the screen moves to the menu lock cancellation ENTER111 Note1 screen. 000 V**** * Pressing in the mode selection screen, the mode CANCEL...
Page 54: Maintenance Menu
6F8A0917 7.3.5 Maintenance Menu If you enter the service code to release the protection, the maintenance specific items in the setting mode that are not displayed normally can be accessed and the parameters that are normally prohibited to be rewritten can be changed. This function is mainly used by service personnel, it is not necessary for general customers to enter this function.
Page 55: Setting Menu List
6F8A0917 7.4 Setting Menu List The constants set in the LF232 converter can be checked or changed in the order shown in the table below. The details of each item are described in the following sections: • Setting items (A to M): Chapter 8. “Parameter Settings / Adjustment” •...
Page 56: Parameter Settings / Adjustment
6F8A0917 8. Parameter Settings / Adjustment 8.1 Parameter Setting Items To check or change each constant set in the LF232 converter, first select the desired setting item described in 7.3.2, “Setting Mode Operation.” For setting mode items, follow the explanation below to perform the settings. Setting item Display example 8.2.1...
Page 57: Parameters Check / Change
6F8A0917 Setting item Display example Preset count value I1: PRESET CNT 00009000 8.2.16 Output function setting I2: PRESET FNC 1:HOLD High/Low limit alarm On/Off J1: H ALM SET 1:ON High/Low limit alarm value J2: H ALM VAL +100.0 % 8.2.17 High high/Low low limit alarm On/Off K1: HH ALM SET 1:ON...
Page 58 6F8A0917 Changing the exciting current value To change the exciting current value, proceed as follows. However, the exciting current value is already adjusted when the product is shipped from the factory. Do not change the exciting current value unless the value is different from the one described on the detector nameplate.
Page 59: Meter Size
6F8A0917 8.2.2 Meter Size Checking the meter size of the detector Proceed as follows to check or change the meter size of the detector. Switch operation Display example Description Select A2: METER SIZE from the setting item selection menu. A2: METER SIZE The currently set meter size of the detector appears.
Page 60 6F8A0917 Changing the meter size of the detector The following is an example to change the meter size from 50mm to 10mm. Switch operation Display example Description Select A2: METER SIZE from the setting item selection. A2: METER SIZE The currently set meter size (50mm in this example) appears. 50 mm A2: METER SIZE The cursor appears.
Page 61: Exciting Frequency
6F8A0917 8.2.3 Exciting Frequency The exciting frequency can be selected from 6Hz, 12Hz and 24Hz. Since the features shown below are apparent depending on the exciting frequency, select an appropriate exciting frequency. Exciting frequency 12Hz 24Hz Zero-point stability Good Response Good Fluid noise immunity Good...
Page 62 6F8A0917 Changing the setting value for exciting frequency. The following is an example to change the exciting frequency from 24Hz to 12Hz. Switch operation Display example Description Select A3: EX FREQ. from the setting item selection menu. A3: EX. FREQ. The currently set exciting frequency (24Hz in this example) 24 Hz appears.
Page 63: Flow Direction
6F8A0917 8.2.4 Flow Direction The flow direction of fluid can be set. Normally use the flowmeter under the condition of NORMAL. Selection item Description 1: NORMAL The flow is a direct flow when the fluid flows in the direction indicated by the arrow on the detector. 2: SWITCH The flow is a direct flow when the fluid flows in the reverse direction of the arrow on the detector.
Page 64 6F8A0917 Changing the flow direction. The following is an example to show how to change the flow direction from NORMAL to SWITCH. Switch operation Display example Description Select A4: FLOW DIRCTN from the setting item selection menu. A4: FLOW DIRCTN The currently set flow direction (NORMAL in this example) 1:NORMAL appears.
Page 65: Password Setting
6F8A0917 8.2.5 Password Setting The password function is provided to prohibit the settings and adjustment for the functions that affect the flow measurement. See 7.4 “Setting Menu List” for the functions limited by the password function. If other than “000” is set for password and the mode is retuned to the measurement mode, the password function becomes valid.
Page 66: Changing The Password
6F8A0917 Changing the password The following is an example to show how to change the password from 123 to 453. Switch operation Display example Description Select A5: PASSWORD from the setting item selection menu. The currently set password data (123 in this example) appears. A5: PASSWORD However, if a wrong password is entered when you move from the measurement mode to the setting mode, *** appears.
Page 67: Normal Indicating Unit
6F8A0917 8.2.6 Normal Indicating Unit You can select one of the units listed below as normal indicating unit for 2 types of units, main unit (UNIT 1) and sub unit (UNIT 2) to be displayed in the measurement mode. • Flow velocity unit: m/s, ft/s •...
Page 68 6F8A0917 Checking the normal indicating unit The following is an example to change the main indicating unit (UNIT1) from % to ml/s. In the case of sub unit (UNIT2), select the function “B2: UNIT 2.” Switch operation Display example Description Select B1: UNIT 1 from the setting item selection menu.
Page 69 6F8A0917 Changing the flow direction for total flow Proceed as follows to change the flow direction for total flow. The following is an example to show how to change the main indicating unit from Forward flow (F) to Forward/Rverse automatic switching (B). In the case of sub unit (UNIT2), select the function “B2: UNIT 2.”...
Page 70: Custom Unit
6F8A0917 8.2.7 Custom Unit The custom unit, which indicates the flow rate multiplied by an arbitrary coefficient, can be defined. The flow rate indication using the custom unit defined here can be used by selecting CUSTOM in the indicting unit setting. The custom unit consists of an coefficient and a unit string Coefficient of custom unit A coefficient to determine the numeric value for indication by custom unit...
Page 71 6F8A0917 Checking the coefficient of custom unit Proceed as follows to check the coefficient of custom unit. Switch operation Display example Description Select B3: CUSTOM DATA from the setting item selection B3: CUSTOM DATA menu. 12340.00 The currently selected coefficient appears. Returns to the menu of setting item selection.
Page 72 6F8A0917 Checking the unit string of custom unit Proceed as follows to check the unit string of custom unit. Switch operation Display example Description Select B4: CUSTOM DATA from the setting item selection B4: CUSTOM UNIT menu. AAA/BBB The currently set unit appears. Returns to the menu of setting item selection.
Page 73: Span Value (Range)
6F8A0917 8.2.8 Span Value (Range) The following constants are set here. (1) Range type (2) Span unit (changeable only for Range 1) (3) Span value (4) Hysteresis Range type By selecting the range type, the multi-range function can be used in which the range in operation is switched between the multiple ranges depending on whether the flow rate is value large or small, or the flow direction is forward or reverse.
Page 74 6F8A0917 Span value The span value can be set using the actual flow rate unit (m /h, etc.) and flow velocity unit (m/s). (1) Setting range The span value can be set within the range of 0 –1.0 ft/s to 0 – 32.8 ft/s (0.1m/s to 10m/s) in terms of flow velocity (The range that detector can measure changes with detector type.
Page 75 6F8A0917 Hysteresis The dead band, which is used to switch the ranges in the case of internal automatic switching multi-range, is set here. It is not necessary to set hysteresis in other range types. (The set value will be ignored.) The hysteresis can be set within the range of 0 to 25% in increments of 0.1%.
Page 76 6F8A0917 Checking each constant How to check the Range 1 is shown here. To check other setting values, select the following function numbers: Range type C1: RANGE TYPE Range 2 span value C3: RANGE 2 Range 3 span value C4: RANGE 3 Range 4 span value C5: RANGE 4 Hysteresis C6: RANGE HYST...
Page 77 6F8A0917 Changing the range type Before changing the span value, Rang type must be set. The following is an example to show how to change the range type from Single range (1:SINGLE) to the bidirectional internal signal switching multi-range (3:2F-2R). Switch operation Display example Description...
Page 78 6F8A0917 Changing the span value The span value for each range is set. The following is an example to show how to change the span value of Range 1 from 2.0m3/h to 100 l/min. Switch operation Display example Description Select C2: RANGE 1 from the setting item selection menu. C2: RANGE 1 The currently set span value for Range 1 (2.0 m /h in this...
Page 79 6F8A0917 Changing the hysteresis The hysteresis value is set to 3% unless otherwise specified when the converter is shipped from the factory. The following is an example to show how to change the hysteresis value from 3% to 5%. Switch operation Display example Description Select C6: RANGE HYST from the setting item selection...
Page 80: Damping Constant
6F8A0917 8.2.9 Damping Constant The damping constant is set to average out the output fluctuations. (The larger the damping constant, the more the output is averaged and the fluctuations can be reduced but the response becomes slower.) The damping constant can be set from 0.0sec, 0.5sec, and 1 to 60sec (1sec each). (If detector is partially filled pipes type, the damping constant can be set from 0.0sec, 5sec, and 10 to 600sec (1sec each).) Note: If 0.0 sec is set, the damping constant becomes a value equivalent to 0.1 sec.
Page 81 6F8A0917 Changing the damping constant The following is an example to show how to change the damping constant from 0.5 sec to 10 sec. Switch operation Display example Description Select D1: DAMPING from the setting item selection menu. D1: DAMPING The currently set damping constant (0.5 s in this example) 00.5 s appears.
Page 82: Low Cutoff Value
6F8A0917 8.2.10 Low Cutoff value The low cutoff is the fuction to forcefully fix the current output to 0% when the flow rate becomes equal or below the low cutoff value set near 0%. The low cutoff value can be set from 0 to 10% and in increments of 0.1%. If 0% is set, the low cutoff function does not work.
Page 83 6F8A0917 Changing the low cutoff value The following is an example to show how to change the low cutoff value from 1.0% to 3.0%. Switch operation Display example Description Select D2: LOW CUT from the setting item selection menu. D2: LOW CUT The currently set low cutoff value (1.0 % in this example) 01.0 % appears.
Page 84: Current Output Setting Used When An Alarm Occurs
6F8A0917 8.2.11 Current Output Setting Used When an Alarm Occurs The current output value setting used when an alarm occurs is the function to fix the current output to a pre-selected value if a fluid empty alarm or a self-diagnosis alarm occurs. For the type of alarms to fix the current output, see the alarm output factor setting in 8.2.19 “Self-Diagnosis Function.”...
Page 85 6F8A0917 Changing the current output value used when an alarm occurs The following is an example to show how to change the current output value, which is used when an alarm occurs, from 4.0mA (2: 4.0mA) to 24.0mA or more (4: OVER 24.0mA). Switch operation Display example Description...
Page 86: Display Low Cut On/Off
6F8A0917 8.2.12 Display low cut On/Off When the low output is cutoff by the setting in 8.2.10 “Low cutoff value,” whether the instantaneous flow rate, flow velocity and % value should be set to zero or not can be selected. Selection Display low cutoff 1: ON...
Page 87 6F8A0917 Changing the display low cut On/Off setting. The following is an example to show how to change the display low cut setting from 2.OFF to 1:ON. Switch operation Display example Description Select D3: 4−20 ALM. OUT from the setting item selection menu.
Page 88: Output Low Limit Setting
6F8A0917 8.2.13 Output Low Limit Setting The low limit for 4 to 20mA output can be selected. If 3.2mA or 2.4mA is selected, the output value of less than 4mA (0%) can be output when the flow is in reverse direction. The output low limit setting can be selected from the items shown in the table below.
Page 89 6F8A0917 Changing the output low limit value setting. The following is an example to change the output low limit setting from 4.0mA (1: 4.0mA) to 3.2mA (2: 3.2mA). Switch operation Display example Description Select D5: LOW LIMIT from the setting item selection menu. D5: LOW LIMIT The currently set output low limit value appears.
Page 90: Digital I/O Function
6F8A0917 8.2.14 Digital I/O Function Digital I/O functions can be selected. Select the digital I/O functions from the items shown below. For details of digital I/O functions, see 10. “Function Description.” Digital output functions (corresponding to each terminal) DO FUNCT. Digital output functions DO3 to DO4 1: NO USE...
Page 91 6F8A0917 Digital Input Function DI FUNCT. Digital input function 1: NO USE Not used 2: C STA/STP Totalizer Start/Stop control 3: C RES/STA Totalizer Reset/Start control 4: RANGE SW1 Multi-range external switching signal 1 5: ZERO ADJ Still water zero adjustment start 6: FIXED OUT Fixed-value output mode control 7: RANGE SW2...
Page 92 6F8A0917 Checking each setting for digital I/O The following is an example to show how to check the function setting of Digital Output 1. To check other setting values, select the following function numbers. Digital Output 1 F1: DO1 FNCTN Digital Output 2 F2: DO2 FNCTN Digital Output 3...
Page 93 6F8A0917 Changing each setting for digital I/O The following is an example to show how to change the function of Digital Output 1 from High limit alarm output (2:HIGH ALM) to Fluid empty alarm (A:EMPTY ALM). To change other setting values, select the following function numbers. Digital Output 1 F1: DO1 FNCTN Digital Output 2...
Page 94: Count Rate (Pulse Rate) And Pulse Width
6F8A0917 8.2.15 Count Rate (Pulse Rate) and Pulse Width Totalizer is incremented each time a volumetric flow set for predetermined count rate enters and one pulse is sent out through DO output. It is necessary to set the count rate and pulse width when the total volumetric flow or count value indication is selected or when pulse output is used.
Page 95 6F8A0917 Pulse width The pulse width for totalizer pulse output is set. If Automatic setting (1:AUTO) is selected for pulse width mode, it is not necessary to set the pulse width. • The pulse width must be set to a value within the range of 0.3ms to 500ms. If you try to set a value exceeding 500 ms, the value will be forcibly changed to 500ms.
Page 96 6F8A0917 Checking the count rate and pulse width How to check the count rate setting is shown below. To check other setting values, select the following function numbers: Pulse width mode H2: PLS MODE Pulse width H3: PLS WIDTH Switch operation Display example Description Select H1: COUNT RATE from the setting item selection...
Page 97 6F8A0917 Changing the pulse width mode setting The following is an example to change the pulse width mode setting from 2:MANUAL to 1:AUTO. Switch operation Display example Description Select H2: PLS MODE from the setting item selection menu. H2: PLS MODE The currently set pulse width mode setting appears.
Page 98 6F8A0917 Changing the pulse width The following is an example to change the pulse width from 100ms to 250ms. Switch operation Display example Description Select H3: PLS WIDTH from the setting item selection menu. H3: PLS WIDTH The currently set pulse width appears. 100.0 ms The cursor appears.
Page 99: Preset Counter
6F8A0917 8.2.16 Preset Counter Preset counter is the function to output a signal through DO when the totalized count reaches a preset value. For details of preset counter function, also see 10. “Function Description.” The following parameters can be set here: (1) Preset count value (2) Preset output function Notes...
Page 100 6F8A0917 Checking the preset counter setting How to check the preset count value is shown below. To check the preset output function, select the function “I2: PRESET FNC.” Switch operation Display example Description Select H1:PRESET from the setting item select menu. I1: PRESET CNT The currently set preset count value appears.
Page 101 6F8A0917 Changing the preset output function The following is an example to show how to change the preset output function from Output state hold (1/HOLD) to One-shot pulse output (2:50ms PULSE). Switch operation Display example Description Select I2:PRESET FNC from the setting item selection menu. I2: PRESET FNC The currently set preset count output function (HOLD in this 1:HOLD...
Page 102: Flow Rate High/Low Limit Alarm
6F8A0917 8.2.17 Flow Rate High/Low limit Alarm The flow rate high/low limit alarm is the function to generate an alarm when the instantaneous flow rate exceeds a preset high limit value (or low limit value). When an alarm is generated, an alarm message is displayed and a signal can be output through DO. Two outputs are provided each for high limit value and low limit value (4 outputs in total of high limit, high-high limit, low limit and low-low limit) and an alarm output can be sent out separately.
Page 103 6F8A0917 Checking the high/low limit alarm setting Proceed as follows to check the high/low limit alarm setting. The following is how to check whether the high limit alarm is provided (On) or not (Off). To check other setting values, select the following function numbers: High limit value J2: H ALM VAL Low limit alarm On/Off...
Page 104 6F8A0917 Changing the high/low limit alarm On/Off The following is an example to change the high limit alarm setting from OFF to ON. To change other high/low limit alarm On/Off setting, select the following functions. High limit alarm On/Off J1: H ALM SET Low limit alarm On/Off J3: L ALM SET High-high limit alarm On/Off...
Page 105 6F8A0917 Changing the high/low limit value The following is an example to change the high limit value from +105% to +103%. To change other high/low limit value setting, select the following functions. Low limit value J4: L ALM SET High-high limit value K2: HH ALM SET Low-low limit value K4: LL ALM SET...
Page 106: Fluid Empty Alarm
6F8A0917 8.2.18 Fluid Empty Alarm Fluid empty alarm is the function to generate an alarm when a condition is detected in which fluid is not filled or water level is not enough in the measuring pipe of the flowmeter. If an alarm is generated, an alarm message is displayed and a signal can be output through DO. Note •...
Page 107 6F8A0917 Changing the fluid empty alarm On/Off setting. The following is an example to change the fluid empty alarm setting from Alarm On (1:NORMAL) to Alarm Off (0:OFF). Switch operation Display example Description Select L1:EMPTY ALM from the setting item selection menu. L1: EMPTY ALM Then the fluid empty alarm On/Off setting appears.
Page 108: Self-Diagnosis Function
6F8A0917 8.2.19 Self-Diagnosis Function Self-diagnosis function is the function to generate an alarm if an error is found from the result of diagnosis of internal circuits, memory, etc. If an alarm is generated, an alarm message is displayed and a signal can be output through DO. The following parameters can be set here: (1) Self-diagnosis alarm On/Off (2) DO alarm output factor setting...
Page 109 6F8A0917 Alarm output factor setting When the diagnosis alarm is output through DO, whether a fluid empty alarm should be added to the condition for alarm output can be selected. Selection Diagnosis error alarm factor Fluid empty alarm is not included 1: WITHOUT EMP Fluid empty alarm is included 2: WITH EMP...
Page 110 6F8A0917 Changing the self-diagnosis function setting The following is an example to change the self-diagnosis function from Self-diagnosis function On (1:ON) to Self-diagnosis function Off (2:OFF). To change the setting for alarm output factors, select the function “L3: ALM PRESET.” Switch operation Display example Description...
Page 111: Rate-Of-Change Limit Value And Control Time
6F8A0917 8.2.20 Rate-of-Change Limit Value and Control Time The rate-of-change limit is the function to prevent a sudden change in flow indication of the converter when the measurement flow signal contains excessive noise. Damping constant is also effective to prevent indication variations by increasing its value but the rate of change limit control is effective against a sudden change in flow indication that the damping constant cannot eliminate.
Page 112 6F8A0917 Changing the rate-of-change limit setting The following is an example to change the limit value from 1.0% to 1.5%. To change the control time, select the function “M2: LIMIT TIME.” Switch operation Display example Description Select M1: LIMIT RATE from the setting item selection menu. M1: LIMIT RATE The currently set rate-of change limit value appears.
Page 113: Initial Settings When Shipped From The Factory
(If multi-range is not specified, Single range is set) C2 to 4 Ranges 1 to 4 Values specified when ordered (described in the Test Record. If not specified, Range 1 is the Toshiba standard range and Ranges 2 to 4 are zeros) Hysteresis 3.0 %...
Page 114 6F8A0917 Parameter name Initial setting values 1/10" to 1/4" 2.5 to 6 mm) Count rate Meter size 1/2" to 1 1/2” 15 to 40 mm) Meter size 0.01m 2" to 4” ( Meter size 50 to 100mm) 0.1m Meter size 6” to 24” (150 to 600mm) Meter size 28”...
Page 115: Fixed Value Output (Loop Check)
6F8A0917 8.4 Fixed Value Output (Loop Check) The fixed value output is the function to output a fixed current and/or a fixed pulse output independently of the flow rate signal. The following parameters can be set here: (1) Fixed value output On/Off setting (2) Fixed current output value (3) Fixed pulse output value Notes...
Page 116 6F8A0917 Fixed pulse output value The pulse frequency is set, which is used to output in the fixed output mode through the DO terminal where the pulse output function is set. The fixed pulse output value can be set within the range of 0 to 1000pps in increments of 1pps. Note: When the pulse output is sent out from DO2 terminal, up to 100pps can be output.
Page 117 6F8A0917 Changing the fixed output function The following is an example to change the fixed output function from Fixed value output OFF to ON and then go on to set the current output value and the pulse output value. To change the current output value or pulse output value independently, select the following function: Fixed current output value N2: FIX CURR...
Page 118 6F8A0917 Changing the fixed output constant The following is an example to change the fixed pulse output value from 50pps to 100pps. To change the fixed current output value, select the function “L2: FIX. CURR.” Switch operation Display example Description Select L3: FIX.
Page 119: Zero Adjustment
6F8A0917 8.5 Zero Adjustment 8.5.1 Still Water Zero Adjustment Still water zero adjustment must be performed when the fluid in the measuring pipe of the detector stays still. Switch operation Display example Description 10.00 m/s − Measured value being displayed (measurement mode) 100.0 % Pressing in the measurement mode for 3 seconds...
Page 120 6F8A0917 Returns to the measurement mode (measured value display E0: MEAS MODE screen). Note1: If the flow rate value is outside of the range of ±1.25 10.00 m/s m/s, the adjustment result will not be reflected on the flow rate 100.0 % measured value.
Page 121: Zero Offset Adjustment
6F8A0917 8.5.2 Zero Offset Adjustment This function is used to perform zero adjustment simply by comparing the output of the flowmeter with other process value without stopping the process flow. If zero adjustment can be performed with still water condition, it is not necessary to set this adjustment value.
Page 122 6F8A0917 Changing the zero offset adjustment value Changing the zero offset adjustment value from +1.0% to − 2.5%. Switch operation Display example Description Select O1: MANUAL ZERO from the setting item selection menu. O1: MANUAL ZERO The currently set zero offset adjustment value appears. +001.0% The cursor appears.
Page 123: Mag-Prover Calibration
6F8A0917 9. Mag-Prover Calibration 9.1 Calibration Items The calibration mode of the LF232 flowmeter converter is used to check or perform zero and span calibration of the converter and check the exciting current. To change the mode to the calibration mode, select the setting item in accordance with the procedure in 7.3.2 “Setting Mode Operation.”...
Page 124: Converter Check / Calibration
6F8A0917 9.2 Converter Check / Calibration 9.2.1 0% Flow Rate Calibration (Zero Calibration) Using Mag-Prover internal calibration circuit, 0% flow rate (hereafter called zero point) calibration can be performed. Checking the zero point Switch operation Display example Description Select P1:FLOW CAL 0 from the calibration item selection P1:FLOW CAL 0 menu.
Page 125: 50% Flow Rate Calibration
6F8A0917 9.2.2 50% Flow Rate Calibration 50% flow rate value can be checked only. Checking the 50% flow rate value Switch operation Display example Description Select P2:FLOW SIG 50 from the calibration item selection P2:FLOW SIG 50 menu. 50.1 % 50% flow rate value using the simulation input appears.
Page 126: 100% Flow Rate Calibration (Span Calibration)
6F8A0917 9.2.3 100% Flow Rate Calibration (Span Calibration) Using the Mag-Prover internal calibration circuit, 100% flow rate value (hereafter called the span value) calibration can be performed. Checking the span value Switch operation Display example Description Select P3:FLOW CAL 100 from the calibration item selection P3:FLOW CAL100 menu.
Page 127: Checking The Exciting Current Value
Span value using the simulation input appears. Returns to the menu of calibration item selection. P4:EX CURR DSP * The exciting current value is adjusted when shipped from the factory. Contact your nearest Toshiba representative if any change is necessary. - 126 -...
Page 128: Function Description
6F8A0917 10. Function Description The LF232 flowmeter converter is equipped with 4 digital outputs and 2 digital inputs (1 digital output as standard), enabling you to use these as various functions such as pulse output and alarm outputs. Digital I/O functions are described below. Functions Description Flow totalization...
Page 129: Digital I/O Specifications
6F8A0917 10.1 Digital I/O Specifications The specifications of the digital I/O terminals of the LF232 converter are as follows: Digital Outputs: (DO1) Output type Transistor open collector (standard) Number of outputs Capacity 30 VDC, 200 mA maximum (DO2 to DO4) Output type Solid-state contact output (non polarity) (option) Number of outputs Capacity...
Page 130: Totalizer And Pulse Output
6F8A0917 10.2 Totalizer and Pulse Output Proceed as follows to use the totalizer and pulse output. Count Rate and Pulse Width Settings Follow the procedure in 8.2.15 “Count Rate (Pulse Rate) and Pulse Width” and set the flow rate per 1 count (1 pulse) (count rate), pulse width mode and pulse width. * Count rate can be set within the range of 3.6 to 3,600,000 pulses/h (1/1000 to 1000 pulses/s) with respect to the set range.
Page 131 6F8A0917 * Continued from the previous page Clear (reset) the totalizer. (Note1) Press switch to clear the count. If you have changed the count rate, clear (reset) the count before you start the totalizer. Start the totalizer. (Note1) • Press to start the totalizer.
Page 132 6F8A0917 Totalizer operation using digital input signals Totalizer and pulse output can be operated. Remote operations of the totalizer and pulse output can be performed using the Digital Input signals. Follow the procedure in 8.2.14 “Digital I/O Function” and set the Digital Input (DI) functions. Operation using Digital Input signals (Standard product, Control signal level: High level) Digital Input function DI input...
Page 133: Multi-Range Functions
6F8A0917 10.3 Multi-Range Functions Five types of multi-range functions can be set using the Range Type: Range Typ Single direction, 4 ranges Internal automatic switching Forward and reverse directions, 2 ranges Internal automatic switching Single direction, 2 ranges External signal switching Forward and reverse directions, 2 ranges External signal switching Single direction, 4 ranges...
Page 134 6F8A0917 Output performance when multiple ranges are used (1) Single direction (internal automatic switching), 4 ranges Output (%) Range 1 20mA Range 4 Range 3 Range 2 Hysteresis (0 to 25%) Reverse direction Forward direction Flow rate Range output No. 1 Range output No.
Page 135 6F8A0917 (2) Forward and reverse directions (internal automatic switching), 2 ranges Output (%) Range 3 Range 1 20mA Range 2 Range 4 Hysteresis Hysteresis Reverse direction Forward direction Flow rate Range output No. 1 Range output No. 2 Output when switched from Reverse to Output when switched from Forward to Reverse Forward direction direction...
Page 136 6F8A0917 (3) Single direction (external signal switching), 2 ranges Output (%) Range 2 Range 1 Reverse direction Forward direction Flow rate External range switching signal H level input L level input (Range output No. 1) • Current output is 4mA as standard when fluid flows in reverse direction. When the low cutoff function is not used (low cutoff setting is 0), it is possible to output the current output signal in linear scale up to 3.2mA or 2.4mA when fluid flows in reverse direction.
Page 137 6F8A0917 (4) Forward and reverse directions (external signal switching), 2 ranges Output (%) Range 3 Range 4 Range 2 Range 1 Reverse direction Forward direction Flow rate External range switching signal L level input H level input H level input L level input (Range output No.
Page 138 6F8A0917 (5) Single direction (external signal switching), 4 ranges Output (%) Range 1 20mA Range 4 Range 3 Range 2 Reverse direction Forward direction Flow rate External range switching L level input H level input H level input L level input signal No.
Page 139: Flow Rate High/Low Limit Alarm Output
6F8A0917 10.4 Flow Rate High/Low Limit Alarm Output Proceed as follows to use the flow rate high/low limit alarm. High/Low Limit Alarm Value Setting • Follow the procedure in 8.2.17 “Flow Rate High/Low alarm” and set the high limit alarm, high-high limit alarm, low limit alarm or low-low limit alarm to ON and set the alarm value.
Page 140 6F8A0917 • In the case of Multi-range setting Output (%) Range 2 Range 1 Range 2 High limit set- pout value Hysteresis 2.5% Hysteresis 2.5% Low limit set- point value Hysteresis 2.5% Low limit alarm High limit alarm Low limit alarm generated generated generated...
Page 141 6F8A0917 • In the case of 2 high limit alarm points (high limit and high-high limit) Output (%) High-high limit set- point Hysteresis 2.5% High limit set-point High-high limit alarm generated High limit alarm generated Time * The output state when an alarm occurs becomes the state set for alarm output of digital output. When the power supply of the converter is turned off, the contact is open.
Page 142: Fluid Empty Alarm Output
6F8A0917 10.5 Fluid Empty Alarm Output Proceed as follows to use the fluid empty alarm. (Note: In the case of LF232*F; Fluid empty alarm function is not usable. Set this function 'OFF'.) Alarm Output Setting • Follow the procedure in 8.2.18 “Fluid Empty Alarm” and set the fluid alarm setting to ON (NORMAL, SENTITIVE or SENSITIVE-H).
Page 143: Preset Counter Output Function
6F8A0917 10.6 Preset Counter Output Function A contact signal is output when the totalized flow count exceeds the preset value (preset count value). Proceed as follows to use the preset counter output. Totalizer Setting • Follows the procedure in 10.2 “Totalizer and Pulse Output” and set necessary items to the totalizer.
Page 144 6F8A0917 Preset counter output performance • Example to reset the totalizer using an external signal input (When preset output level hold (Contact ON) is set) H level input Reset/Start signal L level input (DI control signal level H) Totalizer flow count Preset count set-point value Counter reset...
Page 145 6F8A0917 • Example to reset the totalizer using an external signal input (When one-shot pulse output is set) H level input Reset/Start signal (DI control signal level L) L level input Totalizer flow count Preset count set-point Counter start Counter reset Counter reset Preset output Preset output is OFF...
Page 146 6F8A0917 • Output example of one-shot pulse output Preset count set-point value: 100 Totalizer count Preset output Preset output OFF because pulse width is reached. Input/Output Timing Chart * Preset output goes ON when the count value exceeds the preset value of 100 and the preset output goes OFF when its width reaches the set pulse width.
Page 147: Remote Still Water Zero Adjustment
6F8A0917 10.7 Remote Still Water Zero Adjustment Still water zero adjustment can be performed using an external signal. To use this function, follow the procedure in 8.2.14, “Digital I/O Function” and set the DI as a zero adjustment start signal. [Signal input condition] H level signal Zero adjustment signal...
Page 148: Remote Selection Of Fixed Value Output
6F8A0917 10.8 Remote Selection of Fixed Value Output 4 to 20mA output and pulse output can be set to a fixed preset value using a remote signal input. Proceed as follows to use this function. Fixed Output Value Setting • Follow the procedure in 8.4 “Fixed Value Output (Loop Check)” and set the current output value and pulse output value to be used at the time of fixed output.
Page 149: Converter Error Alarm Output
6F8A0917 10.9 Converter Error Alarm Output If one or more of the following errors occur in a self-diagnosis sequence, an alarm signal will be output using contact signals. List of Alarm Output Factors Diagnosis error alarm output (DO) Diagnosis error item WITHOUT EMP WITH EMP RAM error...
Page 150: Communications Function
6F8A0917 11. Communications Function The LF232 Series Converters are equipped with HART protocol to transmit digital signals over the 4 to 20mA output line. The AF900 hand-held terminal (hereafter called HHT) can be used to check or change various parameters, calibrate the flowmeter or monitor the measured value from a remote place.
Page 151 6F8A0917 Converter terminal block Figure 11.2 Connection to the Converter Main Unit - 150 -...
Page 152: Procedure For Communication With Hht
6F8A0917 11.2 Procedure for Communication with HHT This section describes the HHT basic operations for communication between the flowmeter and HHT. For details, refer to the HHT instruction manual. * Carrying out the following preparatory operations to a commercially available PDA (OS: Windows CE), the PDA can be used as a HHT.
Page 153: Cautionary Notes On Communications
6F8A0917 11.3 Cautionary Notes on Communications Observe the following limitations when you communicate with flowmeter using HHT. Current output load 240 Ω to 1k Ω (including communications line resistance) (1) Load resistance: (2) Load capacitance: 0.25 μ F maximum (including communications line capacitance) (3) Load inductance: 4mH maximum (including communications line inductance) (For maximum cable length, about 2km is a guideline length when CVV-S 1.25mm...
Page 154: Diagnosis And Alarms
6F8A0917 12. Diagnosis and Alarms 12.1 Diagnostic messages The LF232 converter is equipped with the function to diagnose such errors as setting errors, I/O errors or internal errors of the instrument and shows the error messages on the LCD display or on the HHT through communications.
Page 155 6F8A0917 Process error alarm LCD display Description Corrective action The measured value is above the The setting range for measured value 125% of the span. is narrow or the flow rate is unexpectedly large. Check whether OVER 125% the set value is correct or not and check that there is no problem in the process.
Page 156 Internal parts or printed-circuit board must be * ROM ERROR * repaired or replaced. RAM error occurred * RAM ERROR * Contact your nearest Toshiba representative. An error occurred in the internal PARAMETER parameters in the memory FAIL Excitation wires are not Connect the excitation wires correctly.
Page 157: Output When An Error Or Alarm Occurs
6F8A0917 12.2 Output When an Error or Alarm Occurs Measured value Current output Totalizer pulse Error indication Remarks display (4 to 20mA) output 4mA (standard) Stopped After power-up, measurement − (Note 1) ROM ERROR (Note 3) does not start. 4mA (standard) Stopped After power-up, measurement −...
Page 158: Maintenance And Inspection
Replace the display unit with a new one. In order to use the display unit stably for a long time, it is preferable to replace it early. For inspection and replacement, please contact your nearest Toshiba representative. - 157 -...
Page 159 50°C or more. To extend the life of the flowmeter, it is recommended that you replace the power supply unit early. Contact your nearest Toshiba representative for a flowmeter inspection or unit replacement. Product disposal The main body or parts of the converter must be disposed of, according to the rules and regulations of your local government.
Page 160: Troubleshooting
Install the detector correctly according to Does the flow direction agree 4. “Installation.” In addition, set the with the arrow mark on the direction of flow correctly according to 8. detector? “Parameter Settings.” Contact your nearest Toshiba representative. - 159 -...
Page 161: Flow Rate Indication Is Not Correct
Connect the two load resistors in series, connected to the output in if necessary. parallel? Is accuracy calculated as follows? (Measured flow rate) (Actual flow rate) Calculate as shown on the left. Actual flow rate 100 (%) Contact your nearest Toshiba representative. - 160 -...
Page 162: Flow Rate Indication Is Not Stable
Design piping so that the fluid does not carrying bubbles? carry bubbles. Isn't there large-current or high- Install the flowmeter away from the voltage cable or equipment near equipment producing electromagnetic or the flowmeter? electrostatic interference. Contact your nearest Toshiba representative. - 161 -...
Page 163 Operate the EMF converter blocking the Is there any reflecting object such as metal light from the reflecting object by standing plate placed opposing to the control panel? in-between the control panel and the reflecting object. Contact your nearest Toshiba representative. - 162 -...
Page 164: Principle Of Operation
6F8A0917 14. Principle of Operation The operating principle of the electromagnetic flowmeter is based on Faraday's Law of electromagnetic induction. The principle of operation is that an insulated pipe with inner diameter D is placed vertically to the direction of a magnetic field with flux density B (see Figure 14.1). When an electrically conductive fluid flows in the pipe, an electromotive force signal E is induced between a pair of electrodes placed at right angles to the direction of magnetic field.
Page 165: Specifications
6F8A0917 15. Specifications 15.1 Specifications Detector Combined Specifications 1. Measuring range: (measuring range in terms of flow velocity) 0 –1.0 ft/s to 0 – 32.8 ft/s (0 – 0.3 m/s to 0 –10 m/s) For partially filled pipes detectors (Combined detector is LF502) Meter Measurement range 0 –...
Page 166 • Combined detector: LF150 (Meter size 20” to 120” (500 to 3000mm)) ±0.5 % of Rate * * This error is pulse output results calibrated under standard operating conditions at Toshiba’s flow calibration facility. * Individual meter’s measurement error mayvary up to ± 0.8 % of Rate at 3.28 ft/s (1.0 m/s) or more and ±...
Page 167 6F8A0917 3. Other specifications • Conductivity: 5μS/cm or more (If detector is partially filled pipes type, conductivity is 100μS/cm or more) • Power supply: 100 to 240VAC (allowable voltage range: 80 to 264VAC, 50/60Hz) 24VDC (allowable voltage range: 21 to 27VDC) •...
Page 168 6F8A0917 • Range switching output One Digital Output (DO) is used • Single direction, 2-range switching signal • Forward/reverse direction switching signal Two Digital Outputs (DO) are used • Single direction, 4-range switching signals • Forward/reverse 2-range switching signals • High/low limit alarm output An alarm is output when flow rate goes above or below the set-point value Setting range −...
Page 169 • Damping: 0.5 to 60 seconds (settable in increments of 1 second) • Zero adjustment: Adjustable with infrared switches • “Field re-verification” Mag-Prover – Toshiba’s Zero span calibration tool : Allows unit to be re-calibrated and verified using internal software program (for more information contact Toshiba International Corp.)
Page 170: Model Number Table
A Standard • Note 1: For applicable detector code, select one from the following table. To combine with an existing detector, select one depending on the type of replaceable converters. For combination with detectors not listed below, contact Toshiba. Applicable Applicable...
Page 171 6F8A0917 LF232*F (for partially filled pipes detectors) Converter model number table Model number Specification code Description 1 2 3 4 5 6 7 8 9 10 11 12 L F 2 3 2 Separate type converter Purpose Standard Compatible detector For Partially-filled pipes (Meter size : 6”...
Page 172: Outline Drawing
6F8A0917 16. Outline Drawing Electromagnetic Flowmeter Converter LF232 Type Gross mass: approx. 18 lb(8kg) (including a mounting plate) 9.33 (237) φ 0.47( φ 12) hole (4 places) 8.74(222) 6.10(155) 2.94(74) Signal cable connection Power cable connection Output cable connection Ground terminal 2.99 (76) Digital I/O cable connection Excitation cable...
Page 173 6F8A0917 Write down the address and phone number of the distributor from which you purchased this product, the product code, SER.NO. and so on. Distributor Address Name − Phone number Product code LF SER. NO. - 172 -...

Toshiba L5232 Instruction Manual

1 Product Inspection and Storage

2 Overview

3 Names of Parts

4 Installation

5 Wiring

6 Operation

7 Display and Controls

8 Parameter Settings / Adjustment

9 Mag-Prover Calibration

10 Function Description

11 Communications Function

12 Diagnosis and Alarms

13 Maintenance and Inspection

14 Principle of Operation

15 Specifications

16 Outline Drawing

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Summary of Contents for Toshiba L5232

Table of Contents