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Emerson Rosemount 935 Quick Start Manual page 20

Open path combustible gas detector
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Quick Start Guide
To align the detector (see
1. Make sure that the detector and flash source are installed properly.
Installation
2. Remove the front shield using the two captive screws.
3. Install the alignment tool assembly on the detector/source front.
4. Fasten the alignment tool with fastening screws.
1.10.1 Perform crude alignment
Prerequisites
Use a ¼-in. Allen screwdriver for all alignment screws.
Procedure
1. Loosen the horizontal lock screws.
2. Approximately aim the source horizontally towards the detector.
3. Tighten the horizontal lock screw adjacent to the plate.
4. Loosen the vertical lock screws.
If the detector is not properly supported when the lock screws are
loosened, it could fall and get damaged.
Support the detector when loosening the vertical lock screws.
5. Approximately aim the source vertically towards the detector.
6. Tighten the outer vertical lock screw.
7. Repeat this process for the detector.
1.10.2 Perform fine alignment
Refer to
Procedure
1. Remove the front shield and mount the alignment tool on the front
of the source using the three screws.
The alignment tool is supplied in the commissioning kit.
2. Aim the source towards the detector within the horizontal access.
3. Aim the alignment tool to the center of the front window of the
detector or source.
4. Tighten the outer horizontal lock screw.
20
Figure 1-3
provides installation instructions.
CAUTION
Figure 1-4
to see the detector with the alignment tool installed.
and
Figure
1-4):
April 2021
Emerson.com/Rosemount

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