RKI Instruments 65-2405RK-05 - Manual (Page 6)

2 • 65-2405RK-05 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 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 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 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.
PW
R
/
SI
G
W
G
S
2
0
0
1
S
B
R
LE
L
57
-1
0
5
3R
K
ZE
R
O
LEL Detector
J-Box
Controller Terminal Strip
Amplifier
SPA
N
Se
n
s o r
Cu
rr
e n
t
m
A
- Test Point
Reducing Bushing,
3/4 NPT to 1/2 NPT
Jumper Pins,
Factory Use Only
Factory Adjust Pot
Zero Pot
Span Pot
Factory Adjust Pot
+ Test Point Detector Terminal Strip