ISTEC Corporation, your Flow Measurement and Control Specialist

Flow Measurement & Control
5 Park Lake Road, Unit 6
Sparta, NJ 07871 USA
Tel 973-383-9888
Fax 973-383-9088

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Model 9595 Flow Computer

 Model 9595 Meter DisplayThe 9595 is a flow computer that computes a corrected flow based on information derived from raw input signals and stored sensor and fluid properties information. The 9595 can be used for the computation of Heat Flow, Mass Flow, and Corrected Volume Flow. In addition, the flow computer is also used for data logging, communication, remote metering, alarming and control functions.






  • E-Z 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
  • Remote Metering by Wireless or Modem and TROLlink™ Remote Metering Software Available


Operating Temperature: 0° to +50°C
Storage Temperature: -40° to +85°C
Humidity: 0-95% Non-condensing
Materials: UL, CSA, VDE approved


Keypad Type: Membrane Keypad
Keypad Rating: Sealed to NEMA 4
Number of Keys: 16


Universal AC Power: 85 to 276Vrms, 50/60Hz
DC Power Option: 24V DC (16 to 48V DC)
Power Consumption
AC Power: 6.5V/A (6.5W)
DC Power: 300mA maximum
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.


Analog Input
Accuracy: 0.02% FS at 20°C
Voltage Range: 0-10V DC, 0-5V DC, 1-5V DC
Current Range: 4-20mA, 0-20mA,
4-20mA Stacked, 0-20mA 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: 500V Protection (Capacitive Clamp)
Reverse Polarity: No Ill Effects
Over-Voltage Limit: 50V DC Over Voltage Protection
Over-Current Protection: Internally Current Limited Protected to 24V DC


Calibration: Operator-assisted Learn Mode
Operation: Ratio-metric
Basic Measurement Resolution: 16-bit
Update Rate: 2 Updates/sec minimum
Automatic Fault Detection
Signal Over-/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 24V DC

(EPROM Non-volatile 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)


Steam Tables (saturated & superheated), Fluid Properties: Water, Air, Natural Gas, A Variety of User Entered Industrial Fluids or Generic


24V DC @ 100mA (fault-protected with self-resetting fuse)


Number of Outputs: 2
Type: Isolated Current Sourcing (shared common)
Available Ranges: 0-20mA, 4-20mA (Menu-selectable)
Resolution: 16-bit
Accuracy: 0.05% FS at 20°C
Update Rate: 5 Updates/sec
Temperature Drift: Less than 200ppm/°C
Maximum Load: 1000Ω
Compliance Effect: Less than .05% Span
60Hz Rejection: 40dB minimum
EMI: No Effect at 3V/M
Calibration: Operator-assisted Learn Mode
Averaging: User entry of DSP Averaging constant to cause a smooth control action
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.


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.


The Flow Computer is equipped with a pseudo non-volatile real time Clock with display of time and date.
Format: 24-hour Format for Time
Day, Month, Year for Date


Type: 2 Lines of 20 Characters
Types: Back-lit LCD and VFD Ordering Options
Character Size: 0.3" nominal
Materials: UL, CSA, VDE Approved
User-selectable Label Descriptors and Units of Measure


Enclosure Options: 2 Lines of 20 Characters
Size: (See Dimensions)
Depth Behind Panel: 0.3" nominal
Type: DIN
Materials: Plastic, UL94V-0, Flame-retardant
Bezel: Textured Matte Finish


Linear: Vortex, Turbine, Positive Displacement, Magnetic, GilFlo, GilFlo 16-point, ILVA 16-point, etc.
Square Law: Orifice, Venturi, Nozzle, V-Cone, Wedge, Averaging Pilot, Target, etc.
Multi-Point Linearization: May be used with all Flow Meter Types. Including: 16-point, UVC and Dynamic Compensation.


Number of Flow Inputs: One
Input Impedance: 10kΩ Nominal
Trigger Level (Menu-selectable)
High Level Input Logic On: 2.5 to 30V DC
High Level Input Logic Off: 0 to 2V DC
Low Level Input (Mag Pickup) Selectable Sensitivity: 10mV and 100mV
Minimum Count Speed: 0.25Hz (to maintain rate display)
Maximum Count Speed: Selectable: 0 to 50kHz
Over-voltage Protection: 50V DC
Update Speed: 1 Update/sec.


Current: 4-20mA, 0-20mA
Resistance: 100Ω DIN RTD
Accuracy: 0.02% FS at 20°C
100Ω DIN RTD (DIN 43-760, BS 1904):
3-wire Lead Compensation
Internal RTD linearization learns ice point resistance
1mA Excitation current with reverse polarity protection
Temperature Resolution: 0.1°C
Temperature Accuracy: 0.5°C


The Relay Outputs usage is Menu-assignable to (Individual 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: 240V, 5 amp


CE Compliant, UL/C-UL Pending


The Serial Port can be used for Printing, Datalogging, Modem Connection, Two-way Paging and Communication with a Computer.
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)


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
24V DC voltage pulse
Nominal On Voltage: 24V DC
Maximum Sink Current: 25mA
Maximum Source Current: 25mA
Maximum Off Voltage: 30V DC
Saturation Voltage: 0.4V DC
Pulse Duration: User Selectable
Pulse Output Buffer: 8-bit
Fault Protection
Reverse polarity: Shunt Diodes
Over-current: Protected
Over-voltage Protected


Wiring Diagram for Model 9595 Multi-Function Flow Computer Display



Terminal Layout


Terminal Desgnations

Wall-mounting Dimensions

Please contact ISTEC for options and correct P/N

Download PDF VersionDownload Installation Manual