Ametek Thermox Series 2000 WDG-IV User Manual page 46

Figure 3-9. sensor inlet connections.
3-14 | Thermox Series 2000 WDG-IV / IVC / IVCM
Z-Purge shutdown Procedure
Hot internal parts are above the ignition temperature of combustible
gases. Power must be disconnected from both the sensor and control
unit for 90 minutes while maintaining purge air flow before the door
is opened, unless the area is demonstrated to be nonhazardous. The Z-
purge apparatus provided by Thermox meets NFPA 496 under certain
conditions.
Power must not be restored after the enclosure has been opened until the
enclosure has been purged for 65 minutes at a pressure of 0.4" of water.
LIFT-OFF ENCLOSURE - FRONT VIEW
ASPIRATOR AIR INLET
1/4" NPT (F)
HINGED ENCLOSURE - FRONT VIEW
CAL GAS INLET PORT
1/4" COMPRESSION FITTING
CAL GAS INLET
1/4" COMPRESSION FITTING
PURGE AIR INLET
1/4" COMPRESSION FITTING
INSTRUMENT AIR INLET
1/4" NPT (F)