923-ST1
Bulletin 923 - 07/06
PAGE  OF 4
http://www.flowmetrics.com
800-356-6387
Features
EZ Setup Guided Setup for First Time Users
Rate/Total and Batching Functions
Menu Selectable Hardware & Software Features
Environmental Compliance Monitoring and Report
Generation
Universal Viscosity Curve (UVC) and API Eq.
Advanced Batching Features: Overrun Compen-
sation, Autobatch Start, Print End of Batch, Slow
Fill, 2 Stage Batching
Isolated Outputs Standard
RS-232 Port Standard, RS-485 Optional
Advanced Printing Capabilities
Windows Setup Software
Specifications:
Flow Meters and Computations:
Meter Types: All linear and square law meters
supported
including: vortex, turbine, magnetic, PD, target, orifice,
venturi, v-cone and many others
Linearization: Square root, 16 point table or UVC table
Computations: Volume, Corrected Volume & Mass
Fluid Computations: Temperature, Density, Viscosity
and
API 2540 for petroleum.
Environmental:
Operating Temperature: 0°C to +50°C
Storage Temperature: -40°C to +85 C
Humidity : 0-95% Non-condensing
Materials: U.L. approved
Listing: UL/C-UL Listed (File No. E192404), CE
Compliant
Display:
Type: 2 lines of 20 characters
Types: Backlit LCD and VFD ordering options
Character Size: 0.3 nominal
User programmable label descriptors and units of
measure
Description:
The 923-ST1 Flow Computer satisfies the instrument
requirements for a variety of flowmeter types in liquid
applications. Multiple flow equations and instrument
functions are available in a single unit with many advanced
features.
The alphanumeric display shows measured and
calculated parameters in easy to understand format. Single
key direct access to measurements and display scrolling
is supported
The versatility of the 923-ST1 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.
The isolated analog output can be chosen to follow
volume flow, corrected volume flow, mass flow, temperature,
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 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 and printing system setup.
Multi-Function Flow Totalizer,
Ratemeter and Batcher
923-ST1
DIN Enclosure with Two Piece Connectors
On Board Data Logging
DDE Server & HMI Software Available
Enhanced Modem Features for Remote Metering
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 923 - 07/06
PAGE 2 OF 4
http://www.flowmetrics.com
800-356-6387
Keypad:
Keypad Type: Membrane Keypad with 16 keys
Enclosure:
Size: See Dimensions
Depth behind panel: 6.5 including mating connector
Type: DIN
Materials: Plastic, UL94V-0, Flame retardant
Bezel: Textured per matt finish
Real Time Clock:
The 923-ST1 is equipped with a battery backed real time
clock with display of time and date.
Format: 12 or 24 hour time display

Day, Month, Year date display
Power Input:
The factory equipped power option is internally fused. An
internal line to line filter capacitor and MOV are provided
for added transient suppression.
110 VAC Power: 85 to 127 Vrms, 50/60 Hz
220 VAC Power: 170 to 276 Vrms, 50/60 Hz
DC Power: 12 VDC (10 to 14 VDC)

24 VDC (14 to 28 VDC)
Power Consumption:

AC: 11.0 VA (11W)

DC: 300 mA max.
Flow Inputs:
Analog Input:
Accuracy: 0.01% FS at 20° C
Ranges
Voltage: 0-10 VDC, 0-5 VDC, 1-5 VDC
Current: 4-20 mA, 0-20 mA
Basic Measurement Resolution:
16 bit
Update Rate: 4 updates/sec
Automatic Fault detection: Signal over/under-range,
Current Loop Broken
Calibration: Software Calibration (no trimmers) and
Auto-zero Continuously
Extended calibration:
Learns Zero and Full Scale of each range using
special test mode.
Fault Protection:
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 with or without quadrature
or pulse security checking
Input Impedance: 10 K nominal
Pullup Resistance: 10 K to 5 VDC (menu
selectable)
Pull Down Resistance: 10 K to common
Trigger Level: (menu selectable)
High Level Input

Logic On: 3 to 30 VDC

Logic Off: 0 to 1 VDC
Low Level Input (mag pickup)

Sensitivity:

10 mV or 100 mV
Minimum Count Speed:

Menu selectable
Maximum Count Speed:

Menu Selectable: 40Hz, 3000Hz or 20
kHz
Overvoltage Protection: 50 VDC
Auxiliary / Compensation Input:
The auxiliary/compensation input is menu selectable for
temperature, density or not used. This input is used for
the compensated input when performing compensated
flow calculations. It can also be used as a general
purpose input for display and alarming.
Operation: Ratiometric
Accuracy: 0.01% FS at 20° C
Basic Measurement Resolution:

16 bit
Update Rate: 1 update/sec minimum
Automatic Fault detection:
Signal Over-range/under-range
Current Loop Broken
RTD short
RTD open
Fault mode to user defined default settings
Fault Protection:
Reverse Polarity: No ill effects
Over-Voltage Limit (Voltage Input): 50 VDC
Available Input Ranges
Voltage: 0-10 VDC, 0-5 VDC, 1-5 VDC
Current: 4-20 mA, 0-20 mA
Resistance: 100 Ohms DIN RTD
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: 0.01 C Bulletin 923 - 07/06
PAGE 3 OF 4
http://www.flowmetrics.com
800-356-6387
Control Inputs:
Switch Inputs are menu selectable for Start, Stop, Reset,
Lock, Inhibit, Alarm Acknowledge, Print or Not Used.
Number of Control Inputs: 3
Control Input Specifications
Input Scan Rate: 10 scans per second
Logic 1: 4 - 30 VDC
Logic 0: 0 - 0.8 VDC
Input Impedance: 100 K
Control Activation:
Positive Edge or Pos. Level based on product
definition for switch usage.
Excitation Voltage:
Menu Selectable: 5, 12 or 24 VDC @ 100 mA (fault
protected)
Relay Outputs:
The relay outputs are menu assignable to (Individually
for each relay) Low Rate Alarm, Hi Rate Alarm, Prewarn
Alarm, Preset Alarm or General purpose warning
(security), low temperature/high temperature.
Number of relays: 2 (4 optional)
Contact Style: Form C contacts
Contact Ratings: 5 amp, 240 VAC or 30 VDC
Serial Communication:
The serial port can be used for printing, datalogging,
modem connection 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.
Print Out: Custom form length, print headers,

print list items.

Print Initialization: Print on end of batch, key
depression, interval, time of day,
control input or serial request.
RS-485: (optional 2nd COM port)
Device ID: 01-247
Baud Rates: 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 1000 transactions. This
information can be used for later uploading or printing.
Storage format is selectable for Comma-Carriage Return
or Printer formats.
Isolated Analog Output:
The analog output is menu assignable to correspond to
the Uncompensated Volume Rate, Corrected Volume
Rate, Mass Rate, Temperature, Density, Volume Total,
Corrected Volume Total or Mass Total.
Type: Isolated Current Sourcing
Available Ranges: 4-20 mA, 0-20 mA
Resolution: 12 bit
Accuracy: 0.05% FS at 20° C
Update Rate: 1 update/sec minimum
Temperature Drift: Less than 200 ppm/C
Maximum Load: 1000 ohms (at nominal line voltage)
Compliance Effect: Less than .05% Span
60 Hz rejection: 40 dB minimum
Calibration: Operator assisted Learn Mode
Averaging: User entry of damping constant to

cause a smooth control action
Isolated Pulse output:
The isolated pulse output is menu assignable to
Uncompensated Volume Total, Compensated