RKI Instruments 65-2399RK-CH4 - Manual (Page 6)

2 • 65-2399RK-CH4 Combustible Gas Transmitter
Description
The 65-2399RK-CH4 transmitter is calibrated to methane. 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 methane even if there is no
oxygen in the sample which allows detection of methane in an inert atmosphere.
This section describes the components of the methane transmitter. The transmitter is a 4 -
20 mA type detector head. It consists of the methane detector, amplifier, and junction box.
Figure 1: Methane Transmitter Component Location
Amplifier
Controller Terminal Strip
G
LE
L
B
W
R
J-Box
Detector Terminal
Strip
S
PWR
/
S
IG
S
ens
or
C
u rre
n t
m
A
SP
A N
Jumper Pins,
Factory Use Only
Factory Adjust Pot
Zero Pot
Span Pot
Factory Adjust Pot
IR CH4 %Volume
Detector
ZE
R
O
+ Test Point (Red)
100mV-500mV
Range
- Test Point (Black)