RKI Instruments 65-2398RK - Manual (Page 6)

2 • 65-2398RK Combustible Gas Transmitter
Description
The 65-2398RK combustible gas transmitter has two versions, the 65-2398RK-CH4 which
is calibrated to methane and the 65-2398RK-HC which is calibrated to propane. The
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, amplifier, and
junction box.
Figure 1: Combustible Gas Transmitter Component Location
LE
L G
PW
R
/ S
IG
S
IR LEL Detector
Controller Terminal Strip
Amplifier
R
W
B
Detector Terminal
Strip
J-Box
ZE
R
O
+ Test Point (Red)
- Test Point (Black)
Factory Adjust Pot
Span Pot
Zero Pot
Factory Adjust Pot
Jumper Pins,
Factory Use Only
SP
A N
S
ens
o r
C
u
rre
n t
m
A
100mV-500mV
Range