RKI Instruments 65-2461RK - Manual (Page 6)

2 • 65-2461RK PPM Hexane Transmitter
Description
This section describes the ppm hexane transmitter’s components. It is a 4 to 20 mA type
detector head. It consists of the ppm hexane detector, amplifier, and junction box.
Figure 1: PPM Hexane Transmitter Component Location
PPM Hexane Detector
The ppm hexane detector is a MOS type (metal oxide semiconductor) detector 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. Three
color-coded leads extend from the top of the detector. The leads allow you to connect the
detector to the amplifier. The output of the detector is non-linear and is linearized by the
Controller Terminal Strip
Hexane Detector
Mounting Screw
w/ flat and lock washer
Detector Terminal Strip
Span Pot
Zero Pot
Factory Adjust Pot
Load Voltage Pot
Factory Adjust Pot
Factory Use
Jumper Strip
Amplifier
J-Box
1-
2
H
e
x
3-
4
H
2
G
a
s
S
e
le
c
t
1 3 4 2
SP
A
N
ZE
R
O
+ Test Point, Red
Reducing Bushing,
3/4 NPT to 1/2 NPT
Gas Select Jumper,
In Hydrogen Position
Factory Use Jumper Strip
- Test Point, Black
WB
R
D
E
T
E
C
T
O
R
P
W
R
/ S
IG
S