RKI Instruments 65-2451RK-05 - Manual (Page 6)

2 • 65-2451RK-05 Hydrogen Transmitter
Description
This section describes the components of the hydrogen transmitter. The transmitter is a 4 -
20 mA type detector head. It consists of the hydrogen detector, amplifier, and junction
box.
Figure 1: Hydrogen Transmitter Component Location
Hydrogen Detector
The hydrogen 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 detector
has a built in molecular sieve that only allows hydrogen to diffuse into 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 flame arrestor guard is located at the bottom of
the detector and is permanently bonded to the detector housing. The flame arrestor guard
protects the flame arrestor from impact damage. Four color-coded leads extend from the
top of the detector. The leads allow you to connect the detector to the amplifier.
R
G
Controller Terminal Strip
Amplifier (Transmitter)
S
2
0
0
1
S
W
57
-1
053
R
K
B
Hydrogen LEL Detector
J-Box
Se
n
s o
r
C
u
rre
n t
m
A
ZE
R
O Jumper Pins
Factory Use Only
Factory Adjust Pot
Span Pot
Zero Pot
Factory Adjust Pot
SPA
N
+ Test Point Detector Terminal Strip
- Test Point
Reducing Bushing,
3/4 NPT to 1/2 NPT
PW
R
/
SI
G
LE
L