6 • 65-2396RKSS CO
2
Transmitter
Description
This section describes the components of the CO
2
transmitter. The transmitter is a 4 - 20 mA type
detector head. It consists of the CO
2
detector, amplifier, and junction box.
Figure 1: CO
2
Transmitter Component Location
Infrared CO
2
Detector
The 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 NPT threads on each end and a 1 1/4” hex that allows removal or
installation of the detector with a wrench. A porous flame arrestor that is 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 amplifier.
Detector Terminal Strip
J-Box
Amplifier
IR CO2 Detector
Controller Terminal
Strip
B
G
W
R
SP
A
N
ZE
R
O
Zero Pot
Span Pot
S
S
2
0
0
1
PW
R
/
S
IG
LE
L
S
ens
or
Cur
re
nt
m
A
Jumper Pins,
Factory Use Only
Factory Adjust Pot
- Test Point
+ Test Point
Factory Adjust Pot
