RKI Instruments M2A - Gas Specific Sensors; CO and H2 S Detectors

14 M2A Transmitter Operator’s Manual
Figure 4: Oxygen Detectors
CO and H
2
S Detectors
Both types of CO and H
2
S detectors (explosion-proof and non-explosion-proof) have replaceable plug-in sensors
inside the detector housing.
The CO detectors include a charcoal filter disk which is held onto the sensor with a rubber retaining boot. The
charcoal filter disk scrubs out interfering gases to which the CO sensor responds such as H
2
S and certain
hydrocarbons.
The 65-2428 and 65-2428-01 explosion-proof H
2
S detectors both include a rubber boot and a spacer which help
ensure that the sensor remains plugged into the detector housing body. The only difference between the 65-2428
and the 65-2428-01 is that the sensor used in the 65-2428-01 is resistant to degradation caused by frequent
exposure to low levels of H
2
S or occasional exposure to high levels of H
2
S.
The 65-2495RK non-explosion-proof H
2
S detector includes an adhesive-backed gasket inside the detector
housing cap which helps ensure that the sensor remains plugged into the detector housing body.
The table below outlines the M2A part numbers and replacement detector part numbers for the CO and H
2
S
detectors.
Table 5: CO and H
2
S Detectors
Target Gas, Range M2A Part Number Detector Used
CO, 0 - 300 ppm 65-2646RK-05 65-2438 (CSA)
65-2663RK 65-2496RK
CO, 0 - 200 ppm 65-2646RK-05-02 65-2438-01
CO, 0 - 100 ppm 65-2646RK-05-01 65-2438-01
H
2
S, 0 - 100 ppm 65-2645RK-05 65-2428 (CSA)
65-2645-05-07 65-2428-01 (CSA)
65-2662RK 65-2495RK
Cap Gasket
Detector Housing Body
Detector
Housing Cap
Hydrophobic
Membrane
Detector
Housing Cap
Plug-In Oxygen
Sensor
Cap Gasket
Non-XP,
Replaceable-Sensor Capillary Type
Non-XP, Partial
Pressure Type
Oxygen Sensor
Detector Housing Body
Flame
Arrestor
Guard
Detector
Part Number
65-2494RK
Detector Part
Number
65-2510RK
Detector Part Number
65-2514RK
XP,
Replaceable-Sensor CapillaryType
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