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dGW 21

dGW 21

The signalling bell dGW21 was designed to warn, call and signal in group II explosive atmospheres and rough environmental conditions in hazardous
areas. The signalling bell produces a sound volume of approx. 105dB(A) at 1 meter distance.

The frequency of the sound of the bell is approx 1kHz, meaning the signal can be clearly heard against lower frequency background noise. The bell
can also be activated with the presence of a telephone ringing signal in the dRGW 21 version.

The protection of this product is a mixture of Exd “flameproof” for the driver system and Exe “increased safety” for the termination chamber. The dRGW
21 offers initiation by a relay from a telephone ringing voltage. The flameproof chamber contains the electromagnetic driver system and the enclosure is
made from GRP (glass-fibre reinforced polyester), guaranteeing protection against corrosion. As the dGW 21 is safety class II, so there is no
equipotential bonding necessary.

All D.C. versions are also equipped with an electronic contact breaker, increasing product service life.

Data Sheets
dGW21 (635 KB) (PDF)
Product Certificates
Product Certificates – External Link
Declaration of Conformity
Technical Manuals
Technical Manual (366 KB) (PDF)


Certification ATEX, cULus
Protection Class II 2 G Ex de IIC T6.
Certified Ambient Temperature -20°C to +40°C
Ingress Protection IP66
Material GRP
Entries 1x M20 x 1.5 cable gland and 1 blind plug M20 x 1.5.
Weight 5.5kg approx
Options Voltage, colour



  • ATEX II 2 G Ex de IIC T6
  • Housing made of glass-fibre reinforced polyester (GRP)
  • Volume: approx: 105 dB(A)
  • Protection: IP 66
  • Safety class II
    (no equipotential bonding necessary)
  • Version dRGW 21 with integrated telephone call relay
  • Integrated terminal box realized in Ex protection mode increased safety