61-1000RK-05 Combustible Gas Detector• 5
Description
This section describes the components of the combustible gas detector. The detector
includes the sensing elements, flame arrestor, flame arrestor guard, detector housing, and
detector leads.
Sensing elements
Two sensing elements are protected within the detector assembly. Through a series of
thermal and electronic reactions, these elements produce an electrical output that is
proportional to the detection range of the detector.
Flame arrestor
The porous flame arrestor allows the target gas to diffuse into the detector assembly and
contact the sensing elements. The flame arrestor also contains sparks within the detector.
Flame arrestor guard
The flame arrestor guard is permanently bonded to the detector housing and protects the
flame arrestor from impact damage.
Detector housing
The sensing elements and flame arrestor are installed within the detector housing.
Mounting threads (1/2 in. NPT) at the top of the detector allow you to mount the
combustible gas detector into the bottom conduit hub of the junction box. A rainshield
screws onto the bottom of the detector. The rainshield helps protect the detector from
debris in the monitoring environment.
Detector leads
Four color-coded leads extend from the top of the detector. The leads allow you to connect
the combustible gas detector to the amplifier.
Junction Box
The junction box allows you to install the detector at a mounting site that is remote from a
controller, and it protects the detector wiring connections. Two conduit hubs allow you to
mount the detector to the junction box and connect the wiring from the detector to a
controller. Three spacers installed on the back of the junction box control the distance of
the junction box from a mounting surface and insure that there is enough room to install a
calibration cup on the detector during calibration.
The bottom conduit hub includes a 3/4 in. x 1/2 in. reducer that allows you to screw the
detector into the hub. The terminal block within the junction box facilitates the wiring
process. A cover on the front of the junction box allows access to the interior of the
junction box.
