RKI Instruments M2 for 12 VDC - Manual (Page 9)

M2 Transmitter Operator’s Manual, 12 VDC Operation 4
Magnetic Wand
The magnetic wand is a short plastic rod with a magnet in one end. It is used to actuate
the magnetic control switches on the control PCB while the junction box cover is still
installed so that non-intrusive calibration can be performed.
LEL Detector
The LEL detector senses the target gas and is mounted in a 3/4” conduit hub on the right
bottom side of the M2. The LEL detector has a 1/2” NPT thread and requires a 3/4”NPT x
1/2”NPT reducer to mount it in the detector hub.
Internal Description
Figure 2: M2 Internal Components
UP/YES
C
NC
NO
PW
R /SI
G
AL
AR
M
1
FA
IL
-
S
+
LE
L
-
S
+
PW
R /SI
G
RS
4 8 5
AL
A
R
M
2
A
B
C
RS
4
8 5
A
B
C
DOWN/NO
ENTER
Modbus
Terminal S trip
C
NC
NO R KI IN STRU M EN TS
M 2 T RANS M IT TE R
LE
L
C
N
C
NO
R
W
G
B
R
W
G
B
LCD D isplay
Push B utton
Control S witches
ENTER
DOWN/NO
UP/YES
Terminal P CB
Control P CB
TX LED
RX LE D
Alarm 2 L ED
Alarm 1 L ED
Fail LED
View With Cover and
Control PCB Removed
Magnetic
Switc hes
Junction B ox
View With Cover Removed
Detector Current Pot
(Com b/CO2 T ype
Only, F ac tory A djust)
Display Ribbon
Cable C onnector
Termination J umper
Program ming
Connector
(Factory Use)
Detector Term inal S trip
(Com b/CO2 V ersion S hown)
Power/S ignal
Terminal S trip
3/4" NPT C onduit O pening
for W ire E ntry
Relay
Terminal
Strips