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Fiber optic thermometer FOTEMP4

13 July 2012

OPTOcon AG: The fiber optic thermometer FOTEMP4 is ideal for the use in high voltage and medical environments. FOTEMP4 is a general purpose instrument ideally suited for multi-point temperature measurements in a variety of industrial applications.

FOTEMP4, Four-channel signal conditioner is a user-friendly, easy to operate and compact signal conditioner for fiber optical temperature measurement in high electromagnetic interfered environment, in microwave fields and other environments, where measurement with electric temperature sensors is no longer possible.

The measuring device features a large LCD display with LED backlight and comes with standard analog output and RS-232 communication port for real-time data acquisition. It can be controlled directly using the front-panel keypad or using the “FOTEMP-Assistant” software.

The outer jacket of the fiber optic temperature sensors is made out of teflon, at the sensor tip a GaAscrystal (gallium arsenide) is attached. The probe sensor is completely non-conductive. Optocon’s fiber optic sensors offer complete immunity to RF and microwave radiation with high temperature operating capability, intrinsic safety, and non-invasive use. The probes are also designed to withstand harsh and corrosive environments.

Starting at a light wave length of 850 nm GaAs becomes optical translucent. Since the position of the band gap is temperature dependent, it shifts about 0.4 nm/Kelvin. The measurement device contains a light source and a device for the spectral detection of the band gap. This guaranties fast, repeatable and reproducible measurements.

Via the analog outputs and thanks to its accompanying software “FOTEMP-Assistant”, measurement results can be easily controlled and monitored.


  • 2, 3 or 4-channels, Multi-point temperature measurement
  • Measuring range: — 200 °C to + 300 °C
  • High accuracy: +/— 0.2 °C
  • Large backlit LCD-Display
  • Fast and comfortable measuring device
  • RS-232, USB or Profibus DP interface
  • Also available as 16-inch rack mount chassis


  • EMI, RFI and microwave environments
  • High voltage environments
  • Harsh and hazardous environments
  • Nuclear environments
  • Aerospace applications
  • Process monitoring
  • Medical applications (MRT)

  • OPTOcon AG
    Optical Sensors And Systems
    Washingtonstrasse 16/16a
    01139 Dresden
    Germany / Europe
    Tel.: +49 (0)351 843599-0
    Fax: +49 (0)351 843599-111
    Web :
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