RKI Instruments M2A - Manual (Page 9)

M2A Transmitter Operator’s Manual 4
Chapter 2: Description
Overview
This chapter describes external and internal components of the M2A Transmitter.
External Description
This section describes the junction box and all external components of the M2A transmitter.
Figure 1: M2A External Components
Junction Box
The M2A’s cast aluminum junction box is dust and weather resistant. The junction box also
protects the M2A and all connections made to it. Use the three 3/4 in. conduit hubs to mount the
detector to the junction box (factory installed in the bottom hub) and connect wiring from an
external device (left hub). The top hub is shipped with a factory installed and sealed conduit plug to
avoid leaks into the junction box. If necessary, the conduit plug can be removed and the top hub can
be used for wiring.
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. See “Wiring the M2A Transmitter” on
page 18 for complete wiring instructions.
Magnetic
W and Junction Box Cover
3/4 NPT
Conduit Hub
Detector
(Catalytic LEL Detector S hown)
3/4 NPT Conduit Hub, P lugged
Mounting Slot (2x)
W indow