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Chapter 3: Installation & Startup
65-2646RKS-SW M2A Transmitter Operator’s Manual
WARNING: If the controller’s construction is not explosion-proof, the controller must be
installed in an ordinary location. Do not install a non-explosion-proof
controller in a classified location.
If the controller’s construction is explosion-proof and the controller is
installed in a classified location, install a conduit seal at the controller’s wire
entry location that is consistent with the controller’s explosion-proof rating.
WARNING: If the M2A is installed in a hazardous location, use appropriately rated
conduit, conduit fittings, and appropriate construction technique that
complies with the local electrical code.
In addition, use appropriately rated conduit, conduit fittings, and appropriate
construction technique to maintain the NEMA 4X environmental rating of
the junction box and avoid water entering the junction box at the conduit
ports.
8. To maintain the explosion proof classification of the M2A junction box, a conduit seal must
be installed within 2 inches (for Group B environments) or 18 inches (for Groups C and D
environments) of the M2A’s left conduit hub. Adhere to your local electrical code when
installing the conduit seal.
9. Guide multi conductor shielded cable or cables or wires in conduit through the left conduit
hub of the M2A junction box. The number of cables or wires needed will depend on whether
the M2A is wired to a gas monitoring controller or just to power, whether any relays are used,
and whether the Modbus output is used.
WARNING: If the top conduit hub is used for wiring, be sure to seal the threads to ensure
water does not enter the junction box. A conduit seal, which is normally
required to maintain the junction box’s hazardous location rating, will also
help to prevent water from entering through the top port.
NOTE:
If the M2A is being wired to a PLC or DCS device, see “Appendix B: PLC
and DCS Device Wiring” on page 56, then continue with step 8.
