RKI Instruments M2A - Manual (Page 11)

M2A Transmitter Operator’s Manual 6
Catalytic LEL Detectors
The catalytic LEL detectors have a 1/2” NPT thread and require a 3/4”NPT x 1/2”NPT reducer to
install in the detector hub. The rest of the detectors have a 3/4” NPT mounting thread and are
installed directly in the detector hub.
IR Detectors
The IR combustible detectors are generally used instead of the catalytic combustible detectors in
applications where there may be catalyst poisons such as silicone present or where oxygen is not
present in the monitoring environment.
Oxygen Detectors
There are four types of oxygen detectors available, a non-explosion proof partial pressure type, a
non-explosion proof capillary type, a non-explosion proof capillary type with a replaceable sensor,
and an explosion proof (CSA) capillary type with a replaceable sensor. The capillary type’s output
is less susceptible to variations in atmospheric pressure than the partial pressure type. The CSA
type oxygen detector (65-2514RK) and one of the non-explosion proof capillary type detectors
(65-2494RK) have a replaceable plug-in sensor inside the detector housing while the entire oxygen
detector must be removed if replacement is required for the other two.
Figure 2: 65-2514RK Oxygen Detector, CSA
Cl
2
, 0 - 3 ppm • 65-2300RK-CL2
Cl
2
, 0 - 10 ppm • 65-2300RK-CL-10
PH
3
, 0 - 1 ppm • 65-2300RK-PH3
SO
2
, 0 - 6 ppm • 65-2300RK-SO2
Table 2: M2A Detectors
Target Gas, Range Detector(s) Used
Flame Arrestor
Guard
Detector Housing Cap
Oxygen Sensor
Detector Housing Body
Cap Gasket