Owner manual

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/SIG
ALARM 1
FAIL - S +
LEL
- S +
PW R/SIG
RS 485
ALARM 2
A B C
RS 485
A B C
DOWN/NO
ENTER
Modbus
Terminal Strip
C NC NO
RKI INSTRUMENTS
M2 TRANSMITTER
LEL
C NC NO
R W G B
R W G B
LCD Display
Push Button
Control
Switches
ENTER
DOWN/NO
UP/YES
Terminal PCB
Control PCB
TX LED
RX LED
Alarm 2 LED
Alarm 1 LED
Fail LED
View With Cover and
ControlPCBRemoved
Magnetic
Switches
Junction Box
View With Cover Removed
Detector Current Pot
(Comb/CO2 T ype
O
nly, Factory Adjust)
Display Ribbon
Cable Connector
Termination Jumper
Programming
Connector
(Factory Use)
Detector Terminal Strip
(Comb/CO2 Version Shown)
Power/Signal
Terminal Strip
3/4" NPT Conduit Opening
for Wire Entry
Relay
Terminal
Strips