RKI Instruments 65-2395RK-CH4 - Manual (Page 6)

2 • 65-2395RK-CH4 Methane Transmitter
Description
The 65-2395RK-CH4 methane 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 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 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
Infrared CH4 %Volume Detector
The infrared CH4 %Vol. detector is made up of a miniature infrared methane %Vol.
detector housed and encapsulated in a pipe nipple. The pipe nipple has 3/4” NPT threads
on each end and a 1 1/4” hex that allows removal or installation of the detector with a
wrench. A porous flame arrestor that is coated with a hydrophobic film that repels liquids
is on one end of the detector and allows sample gas to enter the detector. Four color coded
leads, red, white, green, and black, extend from the other end of the detector. The leads
allow you to connect the detector to the amplifier.
G
W
RB
LE
L
5
7
-1
053
R
K
PW
R
/
S
IG
S
S
2
001
Amplifier
Controller Terminal
Strip
Detector Terminal Strip
J-Box
IR CH4 % Volume Detector
S
ens
or
C
ur
rent m
A
SP
A
N
Jumper Pins,
Factory Use Only
Factory Adjust Pot
Zero Pot
Span Pot
Factory Adjust Pot
ZE
R
O
- Test Point
+ Test Point