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Chapter 2: Description
M2A-XL Transmitter Operator’s Manual
The table below outlines the M2A-XL part numbers and replacement detector part numbers for
the oxygen detectors.
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.
Table 4: Oxygen Detectors
Target Gas, Range
M2A-XL Part
Number
Detector Used
Oxygen, 0 - 25%
65-2643RK-05
65-2514RK (capillary, CSA)
65-2644RK
65-2510RK (partial pressure)
65-2666RK
65-2494RK (capillary)
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 S ensor
Detector Housing Body
Flam e
Arrestor
Guard
Detector P art Num ber
65-2494RK
Detector Part
Num ber
65-2510RK
Detector P art Number
65-2514RK
XP, Replaceable-Sensor Capillary Type
