| The keyboards of this category are used in areas where a potentially explosive atmosphere occurs. This does not only apply to „classical“ explosion-prone areas such as tank farms or mines, but also increasingly to industrial environments. There are two possibilities to prevent an explosion – either the formation of an explosive atmosphere is prevented or the ignition of which. In most cases it is not possible to eliminate an explosive atmosphere.
| Consequently, the ignition of such a mixture must be avoided. This means that all devices, being a potential ignition source when used in explosion-prone areas, must be designed in such a way that an ignition isimpossible. The keyboards of this category are completely certified and tested for the following protection zones:
| | | Protection zone 1:
| area in which a potentially explosive
atmosphere composed of a mixture of air, combustible gases, vapours or mist may occasionally occur during normal operation. | | | Protection zone 2:
| area in which a potentially explosive
atmosphere composed of a mixture of air, combustible gases, vapours or mist does normally not, or only temporarily, occur during normal operation. | | | Protection zone 22:
| area in which a potentially explosive
atmosphere consisting of a cloud of combustible dust contained in the air does normally not, or only temporarily,
occur during normal operation. |
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