RKI Instruments M2A - Manual (Page 10)

5 M2A Transmitter Operator’s Manual
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 allows you to access the interior of the
junction box.
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.
Gas Detector
The gas detector senses the target gas and is mounted in a 3/4” conduit hub on the right bottom side
of the M2A. A variety of detectors may be used with the M2A. Table 2 below lists the detectors that
can be used with the M2A.
Table 2: M2A Detectors
Target Gas, Range Detector(s) Used
Combustible Gas, 0 - 100% LEL • 61-0140RK (Catalytic UL version)
• 61-0140RK-05 (Catalytic CSA version)
Hydrogen, 0 - 100% LEL • NC-6205-01 (Catalytic UL version, hydrogen specific)
• NC-6205-05 (Catalytic CSA version, hydrogen specific)
CH
4
, 0 - 100% LEL • 61-0190RK-CH4 (IR UL)
HC, 0 - 100% LEL (cal. to propane) • 61-0190RK-HC (IR UL)
CH
4
, 0 - 100% volume • 61-0192RK-CH4 (IR UL)
CO
2
, 0 - 5,000 ppm • 61-0191RK-02 (IR UL)
• 61-0198RK-02 (IR)
CO
2
, 0 - 5% • 61-0191RK-03 (IR UL)
• 61-0198RK-03 (IR)
CO
2
, 0 - 50% • 61-0191RK-05 (IR UL)
• 61-0198RK-05 (IR)
CO
2
, 0 - 100% • 61-0191RK-10 (IR UL)
• 61-0198RK-10 (IR)
Oxygen, 0 - 25% • 65-2494RK (capillary)
• 65-2510RK (partial pressure)
• 65-2511RK (capillary)
• 65-2514RK (capillary, CSA)
CO, 0 - 300 ppm • 65-2433RK-05 (CSA)
• 65-2496RK
H
2
S, 0 - 100 ppm • 65-2423RK-05 (CSA)
• 65-2495RK
NH
3
, 0 - 75 ppm • 65-2300RK-NH3
AsH
3
, 0 - 1.5 ppm • 65-2300RK-ASH3