6 • 61-1000RK/61-0140RK Combustible Gas Detector
Description
This section describes the components of the 61-0140RK and 61-1000RK detectors. The
61-1000RK includes the 61-0140RK combustible gas detector and a junction box. A four
point terminal strip is provided inside the junction box for detector connections. The
61-0140RK does not include a junction box.
Figure 1: 61-1000RK Component Location
61-0140RK Combustible Gas Detector
The combustible gas detector is a catalytic type detector that produces an electrical output
that corresponds to the detection range. It is packaged in a 1/2 NPT nipple with a sintered
metal flame arrestor on one end allowing ambient air to diffuse into the detector. The
flame arrestor also contains any sparks which may occur within the detector. The 1/2 NPT
mounting threads at the top of the detector allow you to mount it into the bottom conduit
hub of the junction box. The controller conduit hubs are normally 3/4 NPT, so a 3/4 x 1/2
NPT reducer may be necessary to install the combustible gas detector. A rainshield screws
onto the bottom of the detector (flame arrestor end). The rainshield helps protect the
detector from rain and debris in the monitoring environment. Four color-coded leads
extend from the top of the detector. The leads allow you to connect the detector to the
terminal block.
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 ensure that there is enough room to install a
calibration cup on the detector during calibration.
The bottom conduit hub includes a 3/4 x 1/2 NPT reducer that allows you to screw the
Rubber
Spacer,
3X
J-Box
Red
Green
LEL Detector
Black
White
