Det-Tronics PIR9400 PointWatch Infrared Hydrocarbon Gas Detector - Manual (Page 11)

9 95-8440 9.3
NOTE
A 3/8” ratchet is needed to use the Cover Removal Tool.
2. Unscrew the factory-tightened electronics mounting
cover (see Figure 12 ) by rotating it counter-clockwise
with the Cover Removal Tool (P/N 009170-001 ).
Only apply torque to the threaded cover. Do not use
improper tools such as pliers or vise grips. Do not
twist or apply any force to the mirror assembly.
3. Slide the electronics mounting cover away from
the base and pull the IR module out of the base as
shown in Figure
13 .
4. Using a small screwdriver, rotate the gas selection
switch from position 0 (methane) to the desired
position. Refer to Figure 14 . Ensure that the tip of
the arrow on the switch lines up with the position
selected.
Reassemble
1. The module is “keyed” using different sized pins
on the bottom of the module. Slide the IR module
into the base and rotate it until the keyed holes are
aligned, then press securely into place.
NOTE
The assembly is designed to fit in a specific
orientation. If the keyed holes are not aligned,
rotate
180° and try again.
2. Screw the electronics mounting cover clockwise
onto the base assembly as shown in Figure 12 .
iMPoRtant
Use the Cover Removal tool to retighten the
electronics mounting cover at a torque setting of
15 Newton-meters. Do not overtighten. Do not
use improper tools such as pliers or vise grips.
Do not apply any torque to the mirror assembly or
reflector tubes.
3. For the aluminum model, slide the outer filter
assembly over the mirror assembly. The outer filter
should be oriented with the solid portion toward the
base of the detector. If it is not oriented correctly, the
filter assembly will not slide onto the unit. Slide the
inner filter assembly into the outer filter assembly
and rotate until it is seated securely, then fasten the
two captive screws using the appropriate tool. See
Figure
10 . For the stainless steel model, slide the
stainless steel collar onto the base assembly, then
slide the baffle onto the unit. Place the end cap on
the baffle and rotate it until it is seated securely, then
fasten the two screws using the appropriate tool.
See Figure
11 .
STAINLESS STEEL COLLAR
BAFFLE
END CAP
CAPTIVE HEX SCREWS (2) A1739
Figure 11—Stainless Steel PIR9400 Disassembly
OUTER FILTER ASSEMBLY
INNER FILTER ASSEMBLY CAPTIVE SCREWS (2)
A1738
Figure 10—Aluminum PIR9400 Disassembly
BASE ASSEMBLY
ELECTRONICS MOUNTING COVER
HYDROPHOBIC FILTER
REFLECTOR TUBES (INSIDE)
MIRROR ASSEMBLY CAPTIVE SCREWS (2)
C1741
Figure 12—IR Module and Base Assemblies
ELECTRONICS MOUNTING
COVER
IR MODULE BASE
COVER REMOVAL TOOL
3/8” RATCHET
B1742
Figure 13—IR Module Removal
ACCESS TO GAS SELECTION SWITCH
GAS SELECTION SWITCH
0 = METHANE (FACTORY SETTING)
1 = ETHANE
2 = PROPANE/BUTANE
3 = ETHYLENE
4 = PROPYLENE
A1740
2
4
6
0
3
5 7
1
Figure 14—Gas Selection Switch Location
at the Bottom of the Electronics Assembly