![background image](http://html1.mh-extra.com/html/rki-instruments/65-2662xl-04/65-2662xl-04_operators-manual_1466999010.webp)
10
•
Chapter 2: Description
65-2662XL-04 M2A-XL Transmitter
H
2
S Detector
The H
2
S detector consists of the detector housing body, detector housing cap, cap gasket, rubber
boot, spacer, and the plug-in sensor.
Figure 2: H
2
S Detector Component Location
Detector Housing Body
The detector housing body protects the electronic components within the housing. Use the
mounting threads at the top of the housing to screw the H
2
S detector into the 3/4 NPT hub on the
bottom of the detector junction box. Two wires extend from the top of the detector housing body.
Use these wires to connect the H
2
S detector to the terminal strip. One of the wires is red and one
of the wires is black.
The housing includes a four-socket pattern. This socket pattern accepts the sensor’s four pins to
secure the sensor within the detector housing. A pre-amplifier, located between the sockets and
two interconnect wires, conditions the sensor’s signal before the signal reaches the controller.
Housing Cap & Cap Gasket
The housing cap screws onto the detector housing. It retains the plug-in sensor and protects it
from damage. The housing cap also includes a flame arrestor which contains any sparks that may
occur within the detector and a flame arrestor guard which protects the flame arrestor from
damage. Unscrew the detector cap to access the plug-in sensor for maintenance or replacement. A
cap gasket seals the interface between the housing and cap. A flame arrestor guard is permanently
bonded to the cap.
Rubber Boot and Spacer
A rubber boot and spacer are installed between the detector housing cap and the sensor. They help
ensure that the sensor remains plugged into the detector housing body.
H2S Plug-in Sensor
Spacer
Cap Gasket
Detector Housing Body
Detector Housing Cap
Flame Arrestor
Guard
Rubber Boot