ATEX and Flameproof Instruments

ATEX is the European certification scheme for equipment used in explosive atmospheres, covering both gas and dust hazards. Flameproof, marked Ex d, is one protection method within that scheme: the enclosure is built to withstand and contain an internal explosion so it can't reach the atmosphere outside. Other methods, such as intrinsic safety (Ex i), limit energy instead of containing it.

They describe how often an explosive gas atmosphere is present. Zone 0 means it's present continuously or for long periods, Zone 1 means it's likely during normal operation, and Zone 2 means it's unlikely and would only last briefly if it occurred. Dust zones 20, 21 and 22 follow the same pattern for combustible dust.

Tell us the zone classification at the mounting point (gas 0, 1, 2 or dust 20, 21, 22), the gas group or dust type, and the required temperature class. With those details we can confirm an instrument with the right marking for your area from our ATEX and flameproof range.

Yes. A certified instrument works the same way in a non-hazardous area as its standard equivalent, so it can be used there without restriction. Buyers sometimes specify certified instruments across a whole plant to standardise on one model, even where only part of the site is classified.

Yes. Many of our ATEX and flameproof instruments, such as the Filsa CD membrane level switch and the Trumen flameproof level range, carry markings for both gas and dust zones. Others are rated for one hazard type only, so check the marking against your area classification before ordering.

Beck pressure and differential pressure switches, Trumen flameproof level and pressure instruments, Hauber-Elektronik vibration sensors, Höntzsch flow probes and handheld meters, Filsa membrane and pendulum level switches, Calex infrared temperature sensors, Auburn dust detectors and KXS refractometers.