RKI Instruments M2A - Manual (Page 12)

7 M2A Transmitter Operator’s Manual
Figure 3: 65-2494RK Oxygen Detector, Non-Explosion Proof, Capillary Type
CO and H
2
S Detectors
Both types of CO and H
2
S detectors have replaceable plug-in sensors inside the detector housing.
The CO detector includes 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 65-2423RK-05 explosion-proof H
2
S detector includes a rubber
boot and a spacer which help ensure that the sensor remains plugged into the detector housing body.
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.
Figure 4: 65-2433RK-05 CO Detector, CSA
Detector Housing Cap
Plug-In Oxygen Sensor
Detector Housing Body
Cap Gasket
Hydrophobic Membrane
Detector Housing Cap
Rubber Boot W ith
Charcoal Filter
Plug-In CO S ensor
Cap Gasket
Detector Housing Body
Flame Arrestor
Guard