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924-ST2
Bulletin 924 - 02/07
PAGE  OF 4
http://www.flowmetrics.com
800-356-6387
Multi-Function Flow Computer
EZ Setup- Guided Setup for First Time Users
Liquid, Gas, Steam and Heat Flow Equations
Utility Metering
Menu Selectable Hardware & Software Features
Internal Data Logging Option
Isolated Pulse and Analog Outputs Standard
RS-232 Port Standard, Modbus RTU RS-485
Optional
Windows Setup Software
NX19 Gas Equations, Stacked DP Transmitters
DDE Server & HMI Software Available
924-ST2
Description:
The 924-ST2 Flow Computer satisfies the instrument
requirements for a variety of flowmeter types in liquid,
gas, steam and heat applications. Multiple flow equations
are available in a single instrument with many advanced
features.
The alphanumeric display offers measured parameters
in easy to understand format. Manual access to
measurements and display scrolling is supported
The versatility of the Flow Computer permits a wide
measure of versatility within the instrument package.
The various hardware inputs and outputs can be soft
assigned to meet a variety of common application needs.
The user soft selects the usage of each input/output
while configuring the instrument. Consider the following
illustrative examples.
The isolated analog output can be chosen to follow
the volume flow, corrected volume flow, mass flow,
temperature, pressure, or density by means of a menu
selection. Most hardware features are assignable by this
method.
The user can assign the standard RS-232 Serial Port for
external data logging, transaction printing, or for connection
to a modem for remote meter reading.
A Service or Test mode is provided to assist the user
during start-up system check out by monitoring inputs and
exercising outputs. The system setup can also be printed.
Specifications:
Environmental
Operating Temperature: 0 to +50 C
Storage Temperature: -40 to +85 C
Humidity : 0-95% Non-condensing
Materials: UL, CSA, VDE approved
Display
Type: 2 lines of 20 characters
Types: Backlit LCD and VFD ordering options
Character Size: 0.3 nominal
User selectable label descriptors and units of measure
Keypad
Keypad Type: Membrane Keypad
Keypad Rating: Sealed to Nema 4
Number of keys: 16
Remote Metering by Wireless or Modem and
TROLlink Remote Metering Software Available
Flowmetrics, Inc.
9201 Independence Avenue
Chatsworth, CA 91311, USA
www.flowmetrics.com
Where Quality is Measurable
Toll Free: (800) 356-6387 Fax (818) 700-1961 Bulletin 924 - 02/07
PAGE 2 OF 4
http://www.flowmetrics.com
800-356-6387
Enclosure
Enclosure Options: Panel, Wall, Explosion Proof
Size: See Dimensions
Depth behind panel: 6.5 including mating connector
Type: DIN
Materials: Plastic, UL94V-0, Flame retardant
Bezel: Textured per matt finish
Power Input
The factory equipped power option is internally fused.
An internal line to line filter capacitor is provided for
added transient suppression. MOV protection for surge
transient is also supported
Universal AC Power: 85 to 276 Vrms, 50/60 Hz
DC Power Option: 24 VDC (16 to 48 VDC)
Power Consumption
AC Power: 6.5 V/A (6.5W)
DC Power: 300 mA max.
Flow Meter Types:
Linear: Vortex, Turbine, Positive Displacement,
Magnetic, GilFlo, GilFlo 16 point, ILVA 16 Point
and others
Square Law: Orifice, Venturi, Nozzle, V-Cone, Wedge,
Averaging Pitot, Target and others
Multi-Point Linearization: May be used with all flowmeter
types. Including: 16 point, UVC and dynamic
compensation.
Flow Inputs:
Analog Input:
Accuracy: 0.02% FS at 20° C
Ranges
Voltage: 0-10 VDC, 0-5 VDC, 1-5 VDC
Current: 4-20 mA, 0-20 mA,

4-20 mA stacked, 0-20 mA stacked
Basic Measurement Resolution: 16 bit
Update Rate: 4 updates/sec
Automatic Fault detection: Signal over/under-range,
Current Loop Broken
Calibration: Operator assisted learn mode
Extended calibration: Learns Zero and Full Scale of
each range
Fault Protection:
Fast Transient: 500 V Protection


(capacitive clamp)
Reverse Polarity: No ill effects
Over-Voltage Limit: 50 VDC Over voltage
protection
Over-Current Protection: Internally current limited
protected to 24VDC
Pulse Inputs:
Number of Flow Inputs: one
Input Impedance: 10 k nominal
Trigger Level: (menu selectable)
High Level Input

Logic On: 2.5 to 30 VDC

Logic Off: 0 to 2 VDC
Low Level Input (mag pickup)

Selectable sensitivity: 10 mV and 100 mV
Minimum Count Speed: 0.25 Hz (to maintain rate
display)
Maximum Count Speed: Selectable: 0 to 50 kHz
Overvoltage Protection: 50 VDC
Update Speed: 1 update/sec.
Temperature, Pressure, Density Inputs
The compensation inputs usage are menu selectable
for temperature, temperature 2, pressure, density or
not used.
Calibration: Operator assisted learn mode
Operation: Ratiometric
Basic Measurement Resolution: 16 bit
Update Rate: 2 updates/sec minimum
Automatic Fault detection:
Signal Over-range/under-range
Current Loop Broken
RTD short
RTD open
Reverse Polarity: No ill effects
Over-Current Limit
(current input) Internally limited to protect input to
24 VDC
Available Input Ranges
Current: 4-20 mA, 0-20 mA
Resistance: 100 Ohms DIN RTD
Accuracy: 0.02% FS at 20° C
100 Ohm DIN RTD (DIN 43-760, BS 1904):
Three Wire Lead Compensation
Internal RTD linearization learns ice point
resistance
1 mA Excitation current with reverse polarity
protection
Temperature Resolution: 0.1°C
Temperature Accuracy: 0.5°
Stored Information (ROM)
Steam Tables (saturated & superheated),
Fluid Properties: Water, Air, Natural Gas, A Variety of
User Entered Industrial Fluids or Generic. Bulletin 924 - 02/07
PAGE 3 OF 4
http://www.flowmetrics.com
800-356-6387
User Entered Stored Information (EEPROM / Nonvolatile
RAM)
Transmitter Ranges, Signal Types
Fluid Properties
(reference density, expansion factor, specific heat,
viscosity, isentropic exponent, combustion heating
value, Z factor)
Units Selections (English/Metric)
Language Translations (optional)
Excitation Voltage
24 VDC @ 100 mA (fault protected with self resetting
fuse)
Relay Outputs
The relay outputs usage is menu assignable to
(Individually for each relay) Hi/Lo Rate Alarm, Hi/Lo
Temperature Alarm, Hi/Lo Pressure Alarm, Pulse Output
(pulse options), Wet Steam or General purpose warning
(security).
Number of relays: 2 (3 optional)
Contact Style: Form C contacts (Form A with 3 relay
option)
Contact Ratings: 240 V, 5 amp
Analog Outputs
The analog outputs are menu assignable to correspond
to the Uncompensated Volume Rate, Corrected Volume
Rate, Mass Rate, Heat Rate, Temperature, Density,
Pressure or Delta Temperature.
Number of Outputs: 2
Type: Isolated Current Sourcing (shared common)
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 3 V/M
Calibration: Operator assisted Learn Mode
Averaging: User entry of DSP Averaging constant to
cause a smooth control action
Listing: CE Compliant, UL/C-UL Pending
Serial Communication
The serial port can be used for printing, datalogging,
modem connection, two way paging and communication
with a computer.
RS-232:
Device ID: 01-99
Baud Rates:
300, 600, 1200, 2400, 4800,


9600, 19200
Parity: None, Odd, Even
Handshaking: None, Software, Hardware
Print Setup: Configurable print list and formatting
RS-485: (optional 2nd COM port)
Device ID: 01-247
Baud Rates:
300, 600, 1200, 2400, 4800,


9600, 19200
Parity: None, Odd, Even
Protocol: Modbus RTU (Half Duplex)
Data Logging
The data logger captures print list information to internal
storage for approximately 5000 transactions. This
information can be used for later uploading or printing.
Storage format is selectable for Comma-Carriage Return
or Printer formats.
Isolated Pulse output
The isolated pulse output is menu assignable to
Uncompensated Volume Total, Compensated Volume
Total, Heat Total or Mass Total.
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
Fault Protection

Reverse polarity:


Shunt Diodes

Over-current Protected

Over-voltage Protected
Real Time Clock
The Flow Computer is equipped with a pseudo nonvola