Models 947, 948 and 960 Leak Detectors Operations and Service Manual
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4.
Models 948/960 only:
Fill the Liquid Nitrogen Cold Trap using the procedure described
in “Liquid Nitrogen Cold Trap (Models 948/960 only)” on page 4-10, steps 5 and 6.
5. Reconnect power and start the leak detector and refer to the “Calibration and Sensitivity
6. Leak check before using for testing.
4.2.5 Air Filter
Check the air filter weekly for dust and dirt. Check more frequently if operating in a dirty
area. The removal of the front lower panel exposes the air filter, as shown in Figure 4-8.
When buildup of dirt, dust, or other contaminants is apparent, replace the filter with a
commercial filter (size 16" x 20" x 1").
Figure 4-8
Air Filter Replacement
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Front lower panel
Removable front panel of the 947/948/960
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Air filter
Commercial filter (16" x 20" x 1")
The air filter should be replaced at least every 12 months to ensure proper airflow through
the 947/948/960.
To replace the air filter:
1. Remove the front panel of the 947/948/960.
2. On the inside of the front panel, grasp the filter at the top.
3. Pull the filter up out of the holder.
4. Remove the filter element and discard it.
5. Place a new filter element into the housing.
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Summary of Contents for 948
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