User guide

Compact Digital Flow Monitor, Model B3000
Page 42 March 2014
EXPLOSIONPROOF ENCLOSURE
The ExDirect instrument enclosure is designed to house instrumentation and control equipment as well as act as a conduit.
Installation
1. ExDirect instrument enclosures are furnished with three 3/4 in. NPT oset through-feed cast hubs for conduit entries.
2. Secure the enclosure to the conduit system. If the enclosure has mounting feet, select a mounting location that will
provide sucient strength and rigidity to support the enclosure as well as the enclosed device and wiring.
WARNING
ELECTRICAL POWER MUST BE “OFF” BEFORE AND DURING INSTALLATION AND MAINTENANCE.
CAUTION
SELECT A MOUNTING LOCATION SO THAT THE ENCLOSURE WILL NOT BE SUBJECTED TO IMPACT BY HEAVY OBJECTS.
IMPACTS CAN DAMAGE ENCLOSED DEVICES OR GLASS LENS.
3. Install sealing ttings as required by Section 501-5 and/or 502-5 of the National Electrical Code® and Section 18 of the
Canadian Electrical Code or any other applicable IEC 60079-14 codes and when enclosure is installed in Class I Group B
hazardous locations. (For CSA Group C applications, unsealed conduit lengths must not exceed 5 ft. or 152 cm.)
3.35 [85.1]
2.25 [57.1]
0.33 [8.4]
5.25 [133.4]
5.65 [143.5]
Figure 32: Ex-proof enclosure dimensions
4. Loosen set screw on instrument cover with a 2 mm Allen wrench.
5. Un-thread instrument cover and carefully set aside to prevent damage to the cover threads and glass lens.
6. Pull wires into enclosure making certain they are long enough to make the required connections and to remove the
instrument or power supply if servicing is required. Install instrument and power supply, if applicable, and make all
electrical connections.
7. Test wiring for correctness by checking continuity and also check for unwanted grounds with insulator resistance tester.
Make sure test equipment being used will not damage instrument to be housed in the ExDirect instrument enclosure.
8. Carefully re-thread cover to enclosure housing. Tighten cover until cover ange contacts body face.