RKI Instruments 61-1001RK - Manual (Page 6)

2 • 61-1001RK Combustible Gas Detector
Description
This section describes the components of the NC-6205-01 and 61-1001RK detectors. The
61-1001RK includes the NC-6205-01 hydrogen detector and a junction box. A four point
terminal strip is provided inside the junction box for detector connections. The NC-6205-
01 does not include a junction box.
Figure 1: 61-1001RK Component Location
NC-6205-01 Hydrogen Detector
The hydrogen 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 detector
has a built in molecular sieve that only allows hydrogen to diffuse into 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. The controller conduit hubs are normally 3/4”
NPT, so a 3/4 in. x 1/2 in. 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.
J-Box
Rubber
Spacer,
3X
Red
Green
Black
Hydrogen Detector
White