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

2 • 65-2405RK 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 rainshield screws onto the bottom of the
detector (flame arrestor end). The rainshield helps protect the detector from rain and
debris in the monitoring environment. Four color-coded leads extend from the top of the
detector. The leads allow you to connect the detector to the amplifier.
S
PW
R
/ S
IG
RW
G
Detector (sensor) Current
Label
Mounting Screw
Amplifier
Controller Terminal Strip
LE
L
B
LEL Detector
Detector Terminal Strip
J-Box
ZE
R
O
SP
A
N
Se
n
so
r
Cu
rr
e
nt
m
A
Red + Test Point
Jumper Pins,
Factory Use Only
Factory Adjust Pot
Factory Adjust Pot
Span Pot
Zero Pot
Black - Test Point
Reducing Bushing,
3/4 NPT to 1/2 NPT