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Chapter 1
1.0 Introduction
1.1 Description of the Flow Computer
The Flow Computer is a microprocessor based instrument
designed to measure and compensate flow in an industrial
environment. Three inputs, temperature, pressure and
flow, are provided for calculating the flow at standard
conditions.
Special signal conditioning circuitry is in-
cluded to allow direct connection of 2, 3 or 4 wire plati-
num Resistance Temperature Detectors (RTD's), voltage
inputs or current loops.
A high speed digital input is
provided for pulsing types of flowmeters. A 32 terminal
strip on the rear panel provides easy connection to the
instrument.
The Flow Computer is powered by 50 or 60 Hz, 110 or 220
VAC, switch selectable, or can be ordered for 12 or 24
VDC power.
The Flow Computer is designed to provide continuous, on-
line, compensation for true flow rate from volumetric flow
transducers. All volumetric, mass or heat flow calcula-
tions are taken with permission from the Flow Measure-
ment Engineering Handbook written by R. W. Miller.
Steam (100% quality, saturated or superheated to 900°F)
computations are based on the 1967 ASME Steam tables.
Operator interface is through a 16 key keypad and a 2
line by 20 character liquid crystal display.
(The Flow
Computer may also be set up entirely through the op-
tional RS232 port.) Range selection, input filtering char-
acteristics, scaling factors, etc. are selected through the
front panel keypad or RS232 interface. There is no need
to disassemble the unit or set any dip switches.
1-1
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