RKI Instruments 65-2394RK-CH4-4 - Manual (Page 6)

2 • 65-2394RK-CH4-4 Combustible Gas Transmitter
Description
The 65-2394RK-CH4-4 combustible gas transmitter utilizes an infrared type of detector
which has some advantages over a catalytic type of combustible detector. The infrared
detector will generally have a longer service life than a catalytic detector, it will require
calibration less often, and it can detect combustible gas even if there is no oxygen in the
sample which allows detection of combustible gas in an inert atmosphere.
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, calibration
cup/splash guard, amplifier, the amplifier junction box, and the detector junction box.
The two junction box configuration is intended for situations where the detector needs to
be installed at an inaccessible location. The detector junction box can be installed at the
inaccessible location and the amplifier junction box can be installed in a more readily
accessible area.
Figure 1: Combustible Gas Transmitter Component Location
G
W
RB
S
ens
or
Cu
rr e n
t
m
A
SP
A
N
ZE
R
O
Am plifier
Factory A djust
Pot
57
-1
05
3
R
K
S
S
2
0
0
1
Jum per P ins,
Factory U se
Only
Detector Ter minal
Strip
- T est P oint
+ T est P oint
Z ero P ot
Span P ot
Factory A djust P ot
Term inal S trip
IR LEL D etector
Detector J-B ox
Am plifier J-B ox
LE
L
PW
R
/
S
IG
Calibration Cup/Splash G uard
Controller T erm inal
Strip