10
Model 4688-IR / 4679-IR
Operation & Maintenance Manual
Manual #087-0007G, 10/2003
Using the Rain Shield
and Filters
Using different combinations of the transmitter's
filters optimizes air flow to the detector.
1. For Outdoor Use - Non-Hose Down
Enviroments
: Use the rain guard (096-2709),
but not optics assembly inner filter (077-0166).
The transmitter is mounted vertically. See Figure
2 for list of parts and Figure 5 for dimensions.
2. For Outdoor /Indoor Use - Hose Down
Environments
: Use the deluge guard (096-
2727), but not optics assembly inner filter (077-
0166). The transmitter is mounted vertically.
See Figure 3 for list of parts and Figure 5 for
dimensions.
3. For Clean Indoor Use
: For use in
applications were no wash-downs or liquid spray
is expected. Use the optics assembly inner filter
(077-0166) and dust shield cage (074-0340),
see Figure 1. The transmitter is typically
mounted vertically, or should the application
require, the transmitter may be mounted
horizontally to provide a more unrestricted flow
of gas over the detector.
Mounting the
transmitter horizontally is application dependent
and should only be done in indoor applications
and where there is no potential for the transmitter's
optics assembly to be exposed to liquid.
4. For Dirty Indoor Use:
For use in
applications were no wash-downs or liquid spray
is expected. Use the inner filter (077-0166), dust
shield cage (074-0340) outer filter (077-0209)
and filter disk (077-0210). The transmitter is
typically mounted vertically, or should the
application require, the transmitter may be
mounted horizontally to provide a more
unrestricted flow of gas over the detector.
Mounting the transmitter horizontally is
application dependent and should only be done in
indoor applications and where there is no potential
for the transmitter's optics assembly to be exposed
to liquid.
5. For Indoor Use - Remote Bump Testing
Installation:
Typical application is a gas
compressor installation where the sensor is
mounted in the ceiling. Use deluge guard (096-
2727) and attach tubing to the 1/4" FNPT fitting.
Use inner filter (077-0166). Apply bump check
gas at a minimum flowrate of 2 LPM. THIS IS
NOT FOR CALIBRATION PURPOSES NOR
ACCURACY VERIFICATION.
Figure 1 - Dust Filter Assembly
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