RKI Instruments 65-2615RK-05-04 - Manual (Page 9)

65-2615RK-05-04 M2 Transmitter Operator’s Manual 4
M2 Junction Box
The M2’s cast aluminum junction box protects the terminal PCB and wiring connections
made to the terminal PCB. Use the top 3/4’’ conduit hub to connect wiring from the
terminal PCB to external power and/or to an external device, typically an RKI controller.
Use the bottom 3/4” conduit hub to wire the remotely installed H
2
S detector. Use the
junction box’s two mounting slots to mount the M2 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 LCD
display and use the magnetic wand to actuate the magnetic control switches so you can
perform non-intrusive calibration. Removing the cover allows you to access the interior of
the junction box.
Detector Junction Box
The detector junction box is intended to be installed remotely from the M2 junction box.
The H
2
S detector is factory installed in the bottom 3/4” NPT conduit hub. A terminal strip
is provided for wiring connections and the detector is factory wired to one side of this
terminal strip. The other side of the terminal strip is for user-supplied wiring to the
detector terminal strip located in the M2 junction box. This wiring should go through the
top 3/4” conduit hub. Three spacers installed on the back of the junction box controls the
distance of the junction box from a mounting surface.
H
2
S Detector
The H
2
S detector consists of the detector housing body, detector housing cap, cap gasket,
rubber boot, spacer, and the plug-in sensor.
Figure 1: H
2
S Detector Component Location
Detector Housing Body
The detector housing body protects the electronic components within the housing. Use the
mounting threads at the top of the housing to screw the H
2
S detector into the 3/4” NPT
hub on the bottom of the detector junction box. Two wires extend from the top of the
H2S Plug-in Sensor
Spacer
Cap Gasket
Detector Housing Body
Detector Housing Cap
Flame Arrestor
Guard
Rubber Boot