2-45
1010PVNFM-3A
Section 2
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 absolute value of either the
min. or the max. flow rate (Vfo) entries. For example, a span be-
tween +10 GPM and -30 GPM, spans the Vfab output from 0 GPM
to 30 GPM.
Vfab
Spanned Absolute
Volumetric Flow
Rate:
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) defines 100% of span. The Min Vs (m/s) defines 0% of
span.
Vs
Spanned Liquid
Sonic Velocity:
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 4 mA span
will be -30 GPM, and the 20 mA span will be +10 GPM.
Vfo
Spanned Volumetric
Maximum span values represent: Minimum span values represent:
100% of span 0% of span
Current output of 20 mA Current output of 4 mA
Voltage output of 10 Vdc Voltage output of 0 Vdc
Pulse output of 5000 Hz Pulse output of 0 Hz
2.7.1 SPAN DATA
The Span Data menu allows you to set 0% and 100% output limits for 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 automati-
cally 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:
PGEN
The [PGEN P/Unit Volume] menu cell entry controls a digital output pulse function and is
available in Custody Transfer units only (designated by a “C” in their part number). It allows
assigning of PGEN digital signal pulses per unit of volume. For example, 1000 output pulses
per unit of liquid.
NOTE: The unit of volume is determined by the Volume Units initially selected from
the [Total Volume Units] menu cell option list (refer to paragraph 4.6.6).
To assign PGEN output pulses:
From the [Span Data] menu press
From the [PGEN P/Unit Volume] menu cell, press to activate the numeric entry.
Use the numeric keys to enter the desired number of PGEN pulses per unit volume.
To store the data press
ENT
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