Pressure monitoring in explosion-endangered areas

:王工
同號
      449147851
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1. Pressure switch with flame-proof enclosure
The pressure switch in flame-proof enclosure can be used directly in the Ex area (Zone 1 and 2 resp. 21 and 22). Maximum switching voltage, switching capacity, and ambient temperature must be taken into account and the rules for the installation in the Ex area must be observed. Special circuits as well as versions with adjustable switching differences are not possible.

2. Pressure switches in Ex-i-version
All pressure switches in normal version can be used in the Ex area Zone 1 and 2 resp. 21 and 22, if they are incorporated in an “intrinsically safe circuit”. In principle, the intrinsic safety is based on, that fact that the control circuit run in the Ex area carries only a small amount of energy, which is not able to generate ignitable sparks.
Isolating switching amplifiers must be tested by the PTB and approved for Ex-installations. Isolating switching amplifiers must in any event be installed outside the Ex zone. 
Pressure switches which are intended for Ex-i installations can be equipped with blue terminals and cable entries. Because of the low voltages and currents which are carried by the contacts of the microswitch, gold plated contacts are recommended (optional function ZF 513).