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FOTEMP-PLUS Compact Signal Conditioner

FOTEMP-PLUS or FOTEMP-OEM-PLUS compact table top fiber optic thermometer system


Fiber Optic Thermometer

The compact Bench Top FOTEMP-PLUS is a 1-4 channel fiber optic thermometer suitable for the end user or oem applications. Together with the TS series fiber optic temperature senors, the FOTEMP-PLUS thermometer system is the ideal solution for monitoring temperature 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 industrieis, microwave, harsh chemical, and medical.

The fiber optic thermometer FOTEMP-PLUS is available with 1, 2 or 4 measurement channels. With a built-in USB interface as standard, the product offers a second interface option of RS232, RS485/Modbus RTU or Ethernet/Modbus TCP.  There is also a choice of voltage or current analog outputs. Real-time data collection is accomplished with the supplied copy of the  FOTEMP-ASSISTANT graphical display/data logging software. An update rate of 250ms per channel allows for fast response.


Number of channels 1, 2 or 4
Power supply 12VDC  (Universal AC wall plug-in power adapter provided)
Power consumption 350 mA
Measuring range —200°C to +300°C  NOTE: Actual measurement range depends on calibration option chosen and temperature range of selected TS sensor.
Accuracy Factory Calibration: +/—0.1°C (1σ)
One-Point Calibration: +/—0.1°C (1σ)
Resolution 0.1°C
Measuring time/channel 250ms per active channel (0.5s update rate for 2 channels, 1s update rate for 4 channels)
Analog output 0-10V or 4-20mA, 14-bit resolution.
Relays Optional: Programmable limit settings
Contact Rating: 2A at 24 VDC, 2A at 120 VAC.
Maximum 48W or 240 VA.

Standard (built-in): USB (ASCII Protocol)

2nd Interface Options: RS232 (ASCII) or RS485/Modbus RTU

Protocol USB and RS232 use ASCII protocol. RS485 interface uses Modbus protocol. Protocol information available for custom programming applications. Support for National Instruments LabView™ available.
Data logging USB and RS232 interfaces support ASCII protocol and compatible with FOTEMP-ASSISTANT data logging software and its Excel file compatibility.
Optical Interface ST, compatible with all TS series fiber optic temperature probes

Storage: -20°C to +70°C

Operating: -20°C to +60°C

Dimensions/Weight/IP 190 x 110 x 90 mm, 0.5 kg, IP54
Material Aluminium housing
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 cal interval is 12 months for ISO quality systems.

Specifications subject to change without notice


  • Robust & durable compact bench top housing
  • 1-4 measuring channels
  • Measuring range: —200°C to +300°C
  • High accuracy: +/—0.1°C
  • Color LCD display
  • 0-10V or 4-20mA analog output
  • 1-4 control relay option, freely assignable to any channel
  • Built-in USB interface (standard)
  • 2nd Interface Option: RS232 or RS485/Modbus RTU
  • Includes FOTEMP-ASSISTANT configuration and data logging software


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


Call +1-805-389-6600 or email

Ordering Information

FOTEMPW-PLUS-X-Y-Z Fiber Optic DIN Rail Mount Signal Conditioner
where W=No. of Channels: 1, 2 or 4 channels
where X=Interface: P0=USB+RS232, P1=USB+RS485/ModbusRTU
where Y=Analog Output Option: V=0-10V or M=4-20mA
where Z=Calibration Option/Measurement Range: A=Basic=-40°C to +200°C; B=HighTemp=-40°C to +300°C; C=Extended=-200°C to +300°C

Quick Ship Configurations

FOTEMP4-PLUS-P0-V-B 4 Channels, USB+RS232, 0-10V, Calibration=-40°C to +300°C
FOTEMP4-PLUS-P0-V-C 4 Channels, USB+RS232, 0-10V, Extended Calibration=-200°C to +300°C
TS2 Sensors, General Purpose TS2-02 or TS2-06
TS3 Sensors, General Purpose, Rigid Tip 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
General Purpose FO Extension Cables (meters) DIST-C320-03 or -05 or -10

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