Chapter 2: Description; Overview; External Description - RKI Instruments M2A Operator's Manual

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.
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 NPT conduit ports to mount the detector to the junction box
(factory installed in the bottom port) and connect wiring from an external device (left port). The top port 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 port can be used for wiring.
WARNING:
Use the junction box's two mounting holes to mount the M2A to a vertical surface at the monitoring site. The
window in the cover on the front of the junction box allows you to view the OLED display and use the magnetic
wand to actuate the magnetic control switches so you can perform non-intrusive calibration. Removing the cover
10
1.800.561.8187
Junction Box Cover
3/4 NPT
Conduit Port
(Catalytic LEL Detector Shown)
Figure 1: M2A External Components
If the top conduit port 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 28 for complete wiring
instructions.
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3/4 NPT Conduit Port, Plugged
Mounting Slot (2x)
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Detector
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Magnetic
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M2A Transmitter Operator's Manual
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