RKI Instruments 61-1001RK-05 - Manual (Page 6)

2 • 61-1001RK-05 Combustible Gas Detector
Description
This section describes the components of the NC-6205-05 and 61-1001RK-05 detectors. The
61-1001RK-05 includes the NC-6205-05 hydrogen detector and a junction box. A four
point terminal strip is provided inside the junction box for detector connections. The
NC-6205-05 does not include a junction box.
Figure 1: 61-1001RK-05 Component Location
NC-6205-05 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. A flame arrestor guard screws onto the bottom of
the detector (flame arrestor end). The flame arrestor guard protects the flame arrestor
from damage and is permanentrly bonded to the detector housing. Four color-coded leads
extend from the top of the detector. The leads allow you to connect the 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 ensure 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
Rubber
Spacer,
3X
J-Box
Green
Red
Hydrogen Detector
Black
White