FC Flow Computer
4
Datalogger (optional)
Type: Battery Backed RAM
Size: 64k
Initiate: Key, Interval or Time of Day
Items Included: Selectable List
Data Format: Printer or CSV Access via RS-232 command
Stored Information (ROM)
Steam Tables (saturated & superheated), General Fluid
Properties, Properties of Water, Properties of Air, Natural
Gas
User Entered Stored Information (EEPROM / Nonvolatile
RAM)
Transmitter Ranges, Signal Types
Fluid Properties
(specific gravity, expansion factor, specific heat,
viscosity,
isentropic exponent, combustion heating value, Z factor,
Relative Humidity)
Units Selections (English/Metric)
RS-232 Communication
Uses: Printing, Setup, Modem, Datalogging
Baud Rates: 300, 1200, 2400, 9600
Parity: None, Odd, Even
Device ID: 0 to 99
Protocol: Proprietary, Contact factory for more information
Chassis Connector Style: DB 9 Female connector
Power Output: 8V (150 mA max.) provided to Modem
RS-485 Communication (optional)
Uses: Network Communications
Baud Rates: 300, 600, 1200, 2400, 4800, 9600, 19200
Parity: None, Odd, Even
Device ID: 1 to 247
Protocol: ModBus RTU
Chassis Connector Style: DB 9 Female connector (standard)
Excitation Voltage
24 VDC @ 100 mA overcurrent protected
Relay Outputs
The relay outputs usage is menu assignable to (Individually
for each relay) Hi/Lo Flow Rate Alarm, Hi/Lo Temperature
Alarm, Hi/Lo Pressure Alarm, Pulse Output (pulse options),
Wet Steam or General purpose warning (security).
(Peak demand and demand last hour optional)
Number of relays: 2 (3 optional)
Contact Style: Form C contacts (Form A with 3 relay option)
Contact Ratings: 240 V, 1 amp
Fast Transient Threshold: 2000 V
Analog Outputs
The analog output usage is menu assignable to correspond
to the Heat Rate, Uncompensated Volume Rate, Corrected
Volume Rate, Mass Rate, Temperature, Density, or
Pressure.
(Peak demand and demand last hour optional)
Number of Outputs: 2
Type: Isolated Current Sourcing (shared common)
Isolated I/P/C: 500 V
Available Ranges: 0-20 mA, 4-20 mA (menu selectable)
Resolution: 16 bit
Accuracy: 0.05% FS at 20 Degrees C
Update Rate: 5 updates/sec
Temperature Drift: Less than 200 ppm/C
Maximum Load: 1000 ohms
Compliance Effect: Less than .05% Span
60 Hz rejection: 40 dB minimum
EMI: No effect at 10 V/M
Calibration: Operator assisted Learn Mode
Averaging: User entry of DSP Averaging constant to
cause an smooth control action
Isolated Pulse output
The isolated pulse output is menu assignable to Uncompensated
Volume Total, Compensated Volume Total, Heat Total or Mass
Total.
Isolation I/O/P: 500 V
Pulse Output Form (menu selectable): Open Collector NPN or
24 VDC voltage pulse
Nominal On Voltage: 24 VDC
Maximum Sink Current: 25 mA
Maximum Source Current: 25 mA
Maximum Off Voltage: 30 VDC
Saturation Voltage: 0.4 VDC
Pulse Duration: User selectable
Pulse output buffer: 8 bit
Real Time Clock
The Flow Computer is equipped with either a super cap or a
battery backed real time clock with display of time and date.
Format:
24 hour format for time
Day, Month, Year format for date
Daylight Savings Time (optional)
Measurement
The Flow Computer can be thought of as making a series
of measurements of flow, temperature/density and pressure
sensors and then performing calculations to arrive at a
result(s) which is then updated periodically on the display. The
analog outputs, the pulse output, and the alarm relays are also
updated. The cycle then repeats itself.
Step 1:
Update the measurements of input signals-
Raw Input Measurements are made at each input using
equations based on input signal type selected. The system
notes the “out of range” input signal as an alarm condition.
Step 2: Compute the Flowing Fluid Parameters-
The temperature, pressure, viscosity and density equations
are computed as needed based on the flow equation and input
usage selected by the user.
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