RKI Instruments 61-1000RKSS - Manual (Page 6)

2 • 61-1000RKSS Combustible Gas Detector
Description
This section describes the components of the 61-1000RKSS detector.
Figure 1: 61-1000RKSS Component Location
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 inch 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
inch NPT mounting threads at the top of the detector allow you to mount it into the
bottom conduit hub of the junction box. A 3/4 in. x 1/2 in. NPT reducer is necessary to
install the combustible gas detector in the junction box. 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 stainless steel, corrosion resistant 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. An O-ring seals the interface between
the junction box cover and the junction box base.
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. A locking set screw on the junction box cover allows you to secure the
junction box cover and prevent it from being removed.
J-Box
Red
Green
Black
Locking Set Screw
White