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CWD2005 DPC
chapter — page:
4—2
4.1 Main switch
Switches the power supply for the device, refer to terminal box on bottom.
Fig. 4.1:
Main switch (example)
4.2 Instrument air purged and pressurised housing
Components that can cause ignition are installed in a housing that is purged with
instrument air. By the purging with air, the concentration of explosive gases re-
mains below the lower explosibility limit. The resulting overpressure prevents the
ingression of explosive gas mixed into the housing. Openings of the housing are
designed in such a way that transfer of a potential ignition hazard to the outside is
prevented.
4.3 Locks and doors of the housing
The purged and pressurized housing is closed with three separated doors. Each
door is operated by two square box keys.
4.4 Flame arresters
Flame arresters prevent the propagation of a potential ignition hazard to other sys-
tem parts.
4.5 Cable / line glands
Cables and lines connected to the housing must ensure tightness in order to ena-
ble overpressure by the instrument air purging.
4.6 Pressure switch, pressure too low
It de-energises the system as soon as the pressure value falls below 0.8 inWC.
Gas inlets are closed.
Содержание CWD2005 DPC
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Страница 119: ...CWD2005 DPC Annex chapter page 11 5 ...
Страница 120: ...CWD2005 DPC Annex February 2015 V2 00 chapter page 11 6 ...