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Functions
7.2 Span Data
7.2
Span Data
The [Span Data] menu allows you to set 0% and 100% output limits for energy rate (Ve),
volumetric flow (Vfo), absolute flow (Vfab) and sonic velocity (Vs). Each menu cell shows
appropriate rate units and time base. If you change flow rate units after spanning the system,
the computer automatically updates the output data setup to reflect the change. Span limits
apply to both the analog outputs and the on-screen stripchart. The flow outputs operate as
follows:
Ve
Spanned energy rate:
Ts, Tr, Td
Spanned Supply, Return Delta Temperature
Vfo
Spanned Volumetric Flowrate:
Vfab
Spanned Absolute Volumetric Flow Rate:
Vs
Spanned liquid sonic Velocity:
102
The entries establish the Ve span. The Max En-
ergy Flow menu cell sets 100% of span while the
Min Energy Flow menu cell sets 0% of span. Use
signed numbers for bi-directional spanning. Note
that negative (reverse) energy is always lower
than positive energy, whatever its absolute mag-
nitude. For example, for a flow measurement
range of -30 KBTU to +10 KTBU, the 4mA span
will be -30 KTBU, and the 20mA span will be +10
KTBU.
Use these menu cells to span the two tempera-
tures, Ts and Tr and the computed temperature
:
difference, Td. Use signed numbers for bidirec-
tional spanning.
The minimum and maximum flow rate entries
establish the Vfo span. The Max Flow menu cell
sets 100% of span. The Min Flow menu cell sets
0% of span. Use signed numbers for bi-
directional spanning. Note that negative (reverse)
flow always is lower than positive flow, whatever
its absolute magnitude. For example, for a flow
measurement range of -30 GPM to +10 GPM, the
4mA span will be -30 GPM, and the 20mA span
will be +10 GPM.
Vfab is the absolute magnitude of the volumetric
flow rate (Vfo). There are no menu cells provided
to span this output. Vfab shares the Vfo span
entries. The Vfab minimum span is always zero.
The maximum span for Vfab is the largest abso-
lute value of either the min. or the max. flow rate
(Vfo) entries. For example, a span between +10
GPM and -30 GPM, spans the Vfab output from 0
GPM to 30 GPM.
Vs is the sonic velocity in meters-per-second
(m/s) of the flowing liquid. The min. and max. Vs
entries establish the Vs span. Max Vs (m/s) de-
fines 100% of span. The Min Vs (m/s) defines 0%
of span.
Operating Instructions, 12/2014, A5E03086491-AC
FUE1010 IP65 NEMA 4X
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