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FOTEMP-T2 Multichannel DIN Rail Mount FO Temperature Sensor Signal Conditioner (formerly INSULOGIX T2)



Multichannel DIN Rail or Chassis Mount Signal Conditioner for Industrial or Medical Applications

The compact FOTEMP-T2 (formerly Insulogix T2) is a multichannel fiber optic thermometry system suitable for the end user or OEM applications. Together with the TS series fiber optic temperature sensors, the FOTEMP-T2 thermometer system is the ideal solution for monitoring multiple sensors in microwave, high frequency, high voltage, magnetic or aggressive environments where metal temperature sensors (RTC, TC, etc.) are either inaccurate or hazardous.

The measurement principle is based on the inherent optical properties of gallium arsenide (GaAs) with temperature. The TS series sensors are offered in different configuration optimized for a a particular operating environment or application – food, process industries, microwave, harsh chemical, and medical.

The fiber optic thermometer FOTEMP-T2 is available with up to 16 measurement channels. With a built-in USB interface as standard, the product offers a second interface option of either RS485/ModbusRTU or Ethernet/ModbusTCP. The product includes up to eight 4-20mA analog outputs and four programmable control relays. Real-time data collection via USB is accomplished with the supplied copy of the FOTEMP-ASSISTANT graphical display/data logging software. Software support for National Instruments LabView™ and Python scripts for Modbus system interfacing are available. An update rate of 250ms per active channel allows for fast response.


Number of Channels

4, 8, 12 or 16

Note: USB interface can only access up to 8 channels. Modbus can access all channels.

Power Supply 24 VDC, Max 40 W
Measuring Range

-200°C to +300°C

NOTE: Actual measurement range depends on calibration option chosen and temperature range of selected TS sensor.
A-Calibration=-40°C to +200°C
B-Calibration=-40°C to +300°C
C-Calibration=-200°C to +300°C

Accuracy Factory Calibration: ±0.2°C (1σ)
One-Point Calibration: ±0.5°C (1σ)
Resolution 0.1°C
Measuring Time per Channel 250 ms per active channel (1 sec update rate for 4 channels, 2 sec update rate for 8 channels, etc.)
NOTE: Disable unused channels using supplied FOTEMP-Assistant software
Analog Output 4-20mA or 0-10V, 14-bit resolution, up to 8 channels
Relays 4 programmable limit settings.
Contact Rating: 2A at 24 VDC, 2A at 120 VAC.
Maximum 48 W or 240 VA.

Standard (built-in): USB (ASCII Protocol) and SD Card

2nd Interface Option: RS485/ModbusRTU or Ethernet/ModbusTCP

Protocol USB uses ASCII protocol, compatible with FOTEMP-Assistant Software and software support provided for National Instruments LabView™ applications. RS485 and Ethernet interfaces use Modbus protocol. Protocol information available for custom programming applications.
Data logging USB interface supports ASCII protocol and compatible with supplied FOTEMP-Assistant data logging software. Output files are Excel compatible.
Optical Interface ST, compatible with all TS series fiber optic temperature probes
Temperature Storage: -20°C to +70°C
Operating: -20°C to +60°C
Dimensions/Weight 204 x 209 x 109 mm, 1.2 kg
Materials Aluminum housing
Mounting DIN Rail or Chassis Mount
Warranty 2 years
Calibration Interval Under normal use, the instrument does not require recalibration. When sensors and cables are changed, a One-Point Calibration is required. Recommended calibration interval is 12 months for ISO quality systems.

Specifications subject to change without notice


  • Robust & durable metal housing
  • Up to 16 measuring channels
  • Measuring range: -200°C to +300°C
  • High accuracy: ±0.2°C
  • LCD display
  • 4-20mA or 0-10V analog outputs
  • 4 control relays
  • USB plus Modbus (choice of RS485/RTU or Ethernet/TCP)
  • Includes FOTEMP-ASSISTANT configuration and data logging software for PC-based USB applications


  • EMI, RFI and microwave environments
  • High voltage environments
  • Oil-filled transformer monitoring
  • Process monitoring
  • MRI and other low/high magnetic field applications


Call +1-805-389-6600 or email

Ordering Information

FOTEMP-T2-W-X-Y-Z Fiber Optic DIN Rail Mount Signal Conditioner
where W=No. of Channels: 4, 8, 12 or 16 channels
where X=Interface: P0=USB+RS485/ModbusRTU, P1=USB+Ethernet/ModbusTCP NOTE: Ethernet/TCP option limited to max 8-channels.
where Y=Analog Output: M=4-20mA, V=0-10V
where Z=Calibration Option: A=Basic=-40°C to +200°C; B=HighTemp=-40°C to +300°C; C=Extended=-200°C to +300°C

Quick Ship Configurations

FOTEMP-T2-8-P0-M-A2 8 Channels, USB, RS485/ModbusRTU, A2-Calibration= -40°C to +200°C
FOTEMP-T2-8-P1-M-A2 8 Channels, USB, Ethernet/ModbusTCP, A2-Calibration= -40°C to +200°C
FOTEMP-T2-16–P0-M-A 16 Channels, USB, RS485/ModbusRTU, A2-Calibration= -40°C to +200°C
TS3 Sensors, General Purpose TS3-10MM-02 or TS3-10MM-06
TS4 Sensors, Harsh TS4-02 or TS4-06
TS5 Sensors, Medical TS5-20MM-02 or TS5-20MM-06
Industrial Grade FO Extension Cables (meters) DIST-C900-03 or -05 or -10
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