6 • 65-2405RK-05-04 Combustible Gas Transmitter
Description
This section describes the components of the combustible gas transmitter. The transmitter is a 4 - 20
mA type detector head. It consists of the combustible gas detector, amplifier, and junction box.
Figure 1: Combustible Gas Transmitter 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 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 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
is located at the bottom of the detector and is permanently bonded to the detector housing. The flame
arrestor guard protects the flame arrestor from impact damage. Four color-coded leads extend from the
top of the detector. The leads allow you to connect the detector to the amplifier.
S
LE
L
PW
R
/
S
IG
B
R
W
G
Detector
Junction Box
ZE
R
O
Terminal Strip
SP
A
N
Se
n
so
r
C
u
rr
ent
m
A
Amplifier
Junction Box
Combustible Gas Detector
Calibration Cup/Splash Guard
