RKI Instruments 61-0191RK - Manual (Page 6)

2 • 61-1004RK/61-0191RK Carbon Dioxide Detector
Description
The 61-1004RK CO
2
detector has four versions, the 61-1004RK-02 which has a detection
range of 0 - 5,000 ppm, the 61-1004RK-03 which has a detection range of 0 - 5% volume,
the 61-1004RK-05 which has a detection range of 0 - 50% volume, and the 61-1004RK-10
which has a detection range of 0 - 100% volume. The detector is an infrared type of
detector. This section describes the components of the 61-1004RK and 61-0191RK
detectors. The 61-1004RK includes the 61-0191RK detector and a junction box. A four
point terminal strip is provided inside the junction box for detector connections. The
61-0191RK does not include a junction box. Figure 1 below shows the components of the
61-1004RK.
Figure 1: 61-1004RK Component Location
61-0191RK Infrared CO
2
Detector
The infrared CO
2
detector is made up of a miniature infrared CO
2
detector housed and
encapsulated in a pipe nipple. The pipe nipple has 3/4 inch NPT threads on each end and
a 1-1/4 inch hex that allows removal or installation of the detector with a wrench. A
porous flame arrestor coated with a hydrophobic film that repels liquids is on one end of
the detector and allows sample gas to enter the detector. Four color coded leads, red,
white, green, and black, extend from the other end of the detector. The leads allow you to
connect the detector to the terminal block in the junction box.
To distinguish the different ranges of CO
2
detectors from one another, a short length of
shrink tubing is applied to the wiring where it comes out of the nipple. The following
table indicates the color of the shrink tubing and the color of the wire to which it is
applied.
J-Box
Green
Red
White
Rubber
Spacers,
3X
IR CO2 Detector
Black