924-ST2 - Flowmetrics
9201 Independence Avenue
Chatsworth, CA 91311, USA
Flowmetrics, Inc.
“Where Quality is Measurable”
http://www.flowmetrics.com
924-ST2
(818) 407-3420 • (800) 356-6387
Fax (818) 700-1961
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, Analog and Relay 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
• Remote Metering by Wireless or Modem and
TROLlink Remote Metering Software Available
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
990088 06/25/16
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.
http://www.flowmetrics.com
Bulletin 924 - 06/16
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, OLED and VFD ordering options
Character Size: 0.2” nominal
User selectable label descriptors and units of measure
Keypad
Keypad Type: Membrane Keypad
Keypad Rating: Sealed to Nema 4
Number of keys: 16
Keypad Rating: Sealed to NEMA 4X / IP65
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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
http://www.flowmetrics.com
Bulletin 924 - 06/16
Pulse Inputs:
Number of Flow Inputs: one
Input Impedance: 10 k Ω 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.
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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
http://www.flowmetrics.com
Bulletin 924 - 06/16
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 nonvolatile
real time clock with display of time and date.
Format:
24 hour format for time
Day, Month, Year for date
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RATE
2
PRE 1
3
TEMP
4
GRAND
6
SCROLL
7
PRE 2
8
DENS
9
PRINT
5
0
TIME
–
2.83
(72)
CLEAR
MENU
HELP
•
ENTER
6.18 (157)
Dotted Line Shows Optional Bezel Kit
0.5
(13)
6.15 (156)
0.28 (7.2)
Terminal Layout
DC (+)
DC (-)
STOP
TOTA
1
AC LINE
AC LINE
START
GP
M
23
24
RATE
147.43
TOTA 267395.749
3.43
(87)
17 NO
18 COM RLY1
19 NC
20 NC
21 COM RLY2
22 NO
5.67 (144)
POWER IN
Terminal Designations
1
DC OUTPUT
FLOW
Vin (+)
2
PULSE IN
IN
---------Iin (+)
3
4
COMMON
TEMPERATURE
5
RTD EXCIT (+)
IN
RTD SENS (+)
6
Iin (+)
RTD SENS (-)
7
DC OUTPUT
8
PRESSURE
9
RTD EXCIT (+)
(TEMP 2)
10 RTD SENS (+)
IN
Iin (+)
11 RTD SENS (-)
12 PULSE OUTPUT (+)
13 PULSE OUTPUT (-)
14 ANALOG OUTPUT 1 (+)
15 ANALOG OUTPUT 2 (+)
16 ANALOG OUTPUT COMMON (-)
Fig. 1: Standard Dimensions
Rear View
Phone Line for
Internal Modem
Option
0.4 (10)
RS-232
RS-485
5 4 3 2 1
9 8 7 6
5 4 3 2 1
9 8 7 6
1 2
(optional)
5.43
(138)
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24
Panel
Cutout
Ordering Information
2.68
(68)
Example
924-ST2
L
10P
M
Series:
Dimensions are in inches (mm)
Display Type:
L= LCD
O= OLED
V= VFD
Input Power:
1= 85 to 276 VAC
3= 24 VDC (16 to 48 VDC)
Network Card:
0= None
1= RS485/Modbus (optional 2nd COM port)
Mounting:
P= Panel Mount
N= NEMA 4 Wall Mount
W= NEMA 12/13 Wall Mount w/ Clear Cover
E= Explosion Proof (No Button Access)
Fig. 2: Wall Mount (“W” mounting option) Dimensions
9.4 (238)
7.3 (184)
4.13 (105)
2.34 (59.5)
Security Tag
Provisions
0.385
(9.8)
2.33 (59)
0.472
(12)
0.59
(15)
5.7 (145)
8.4 (213.4)
Options:
0.75
(19)
1.06 1.10 1.10 1.10 1.10
(27) (28) (28) (28) (28)
0.75” Conduit Knockouts
(5 places)
1.10 1.10 1.10 1.10
(28) (28) (28) (28)
7.8 (198)
http://www.flowmetrics.com
Bulletin 924 - 06/16
0.63
(16)
1 = Peak Demand
2 = AGA NX-19 calculation for natural gas
3 = Three Relays
4 = Stacked DP option
5 = Datalogger option (consult factory)
6 = Stack Emissions Controller option
7 = Manifold Flowmeter Controller option
9 = 3 Relay Super Chip (options 1, 2, 4, 6,7)
10 = 2 Relay Super Chip (options 1, 2, 4, 6,7)
13 = Superchip; 2 relay, Positive heat only
14 = Superchip; 3 relay, Positive heat only
ET= Extended Tempertaure; -4°F to 131°F (-20°C to 55°C)
IM = Internal Modem
M = Modem Power Option
TB= RS485 Terminal Block for Panel Mount Enclosure
Accessories:
OPC/DDE Server for RS232 Port available, see EX5-UCOND-NA00
OPC/DDE Server for Modbus Suite available, see EX5-MDBUS-NA00
Modem Available, see MPP-56KN and MPP-2400N
Serial printer available, see P1000, P295
Ethernet Port Server available, see IEPS
Ethernet Port Server Modbus TCP available, see ADAM4572
RS-422/485 to RS-232 Communication Adapter available, see CA285
RS232 Extender Cable: P/N=13220-<length in inches>
800-356-6387
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