RKI Instruments M2A-XL, Руководство оператора

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36 • Chapter 3: Installation & Startup M2A-XL Transmitter Operator’s Manual
WARNING: To maintain the explosion proof classification of the M2A-XL, a conduit seal
must be used within a certain distance of the junction box conduit hub used
for wiring to the controller, as outlined in the table below.
7. Guide multi conductor shielded cable or cables or wires in conduit through the conduit port on
the left side of the junction box. The number of cables or wires needed will depend on whether
the M2A-XL 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 port 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-XL is being wired to a PLC or DCS device, see “Appendix B:
PLC and DCS Device Wiring” on page 92, then continue with step 8.
Location Detector Conduit Seal Within
Group B
Locations All XP detectors 2 inches for all environments
Group C
and D
Locations Catalytic LEL
(CSA) 2 inches for all environments
Catalytic LEL (UL) 18 inches for all environments
CO and H
2
S XP 2 inches for all environments
IR non-replaceable
XP 18 inches for all environments
IR replaceable XP 18 inches for environments (do not install
detector in environments with acetic acid)
O
2
XP