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Fagus GreCon, Inc.648 Griffith Rd. Suite A
Charlotte, NC 28217U.S.A.

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Spark Detector FM 3/8

The best ignition source detection for high-temperature applications

Key Benefits

  • Highly sensitive detection of sparks and embers in high-temperature applications
  • Detection not dependent on temperature of ignition source
  • Highly reliable detection of ignition sources, even at high transport speed and load
  • Flush-mounted installation of detector optics for maximum life
  • VdS and FM approved - Dust Ex safety options available for ATEX and IECEx


The FM 3/8 is a highly sensitive spark and ember detector for protection against fire and explosion in industrial processes.  It uses fibre optic cables to deal with high material temperatures (up to 500 °C) used in certain industrial processes. The detector reacts to the infrared range of light radiated by an ignition source.  It is designed to be used in an environment free from ambient light.

The detector can be connected to every GreCon control console using a standard three core cable.  A range of flexible mounting adapter options exist to suit any environment. The control console interfaces with the detector for monitoring of ignition sources within the process, the configuration of detection parameters and automated check of the detector optics’ correct function. Fibre optic cables in various lengths allow the detector to be situated remotely outside the high temperature area.

Technical Specification

In a brief

For high temperature or high pressure applications, the fiber optic cables carry the IR energy to three separate photo diodes within the sensor


Supply voltage range: 18 V to 22 V DC
Current drawan at 20 V: 10 mA ± 1 mA
Spectral sensitivity: 780 nm to 1100 nm
Temperature range, environment: -40 °F to +158 °F [-40 °C to +70 °C]
Ambient temperature in the material flow: up to 1112 °F [600 °C] at the lens
Relative atmospheric humidity: 0 to 95 %, non-condensing
Transportation speed: 6 to 164 ft/s [2 to 50 m/s] (other speeds on demand)
Use: in non-explosive areas, in areas without daylight and artificial light
Material of housing: aluminium die casting (GD-AlSi12)
Degree of protection: IP 65
Connection: ready-to-use connecting cable, cable length 8 ft [2.5 m] (3 x 0.5 mm²) optionally 82 ft [25 m] (3 x 0.5 mm²)
Housing dimensions: 3.3 x 3.3 x 1.2 in [84 x 84 x 31 mm]
Housing colour: red (RAL 3000), lacquered
Weight: 490 g (excluding connecting cable)
Available mounting adapters: Screw-in mounting adapter FM 3/8 Ex, Weld-on mounting adapter FM 3/8 Ex, Purge air adapter SPA and SPA Ex

Air purge adapter

If dirt accumulation or other build-up on the sensor optics is expected, special air purge adapters increase the detection reliability. Cleaning intervals are thus extended.