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FHF Secondary Telephone Bell

High-volume explosion-proof telephone call signalling for indoor and outdoor applications.

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The explosion-proof secondary telephone bell is designed for indoor and outdoor applications in potentially explosive industrial areas, e.g in the petrochemical industry.

The high-quality materials have priorily been tested in our laboratory and allow for uses in extreme application areas of the Ex II industry.

The user may choose between single tone, 2-tone, 3-tone or warble-tone using the available DIP switches. Moreover, the tone sequence frequency can be set in four steps between 5 and 20 Hz.


  • IP 66 according to EN 60529
  • High-volume multitone bell
  • II 2G Ex e ib mb IIC T6
Operating temperature -20°C to +40°C
Ingress protection IP66
Material Aluminium
Weight 0.5kg approx

FHF Secondary Telephone Bell Datasheet

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