An ex-zone is an area in which flammable gases, vapours, mists or dust can mix with air in such a way that one single spark is sufficient to detonate the mixture. If electrical equipment is operated in an ex-zone, it must be guaranteed that it will not become an ignition source.
Classification as a hazardous area
The classification of a room as a potentially explosive atmosphere is based on the nature of the flammable substances contained and the probability that these substances will create an explosive atmosphere.
If gases, vapours or mists are present, the room is assigned zone 0, 1 or 2. Zone 0 is frequent, Zone 1 is occasional and Zone 2 is seldom likely to contain explosive mixtures.
A potentially explosive atmosphere caused by dust requires classification into zones 20, 21 or 22.
A detailed set of technical regulations determines the design of electrical equipment in order to conform to the requirements of the respective zone.
Ex devices in the Rixen Messtechnik product range
In order to make it easier for you to decide on the suitability of our Ex instruments, we have had the relevant pressure gauges certified in accordance with the ATEX directives. In the EU, the ATEX directives form the basis for proof of the safety of individual Ex instruments.
Our differential pressure gauge RW65_EX_II is certified according to ATEX II 1 GD Ex ia IIC/IIIC T4 Ga Da. This marking contains all the results of the tests coded according to the individual regulations. The character combinations “1 GD” and “Ex ia” within the key indicate the suitability for all Ex zones.
The differential pressure gauge MU-Analog-65-EX can be used in Ex-area zone 2.