Models 947, 948 and 960 Leak Detectors Operations and Service Manual
4-32
4.2.8.1 Condition of Oil (Oil-sealed Mechanical Pumps)
Excess water in the oil of the Rough pump or the Forepump is indicated by a milky or frothy
appearance. Refer to your pump manual for instructions.
4.2.9 Cleaning the Test Port
The test port is located at the front center of Models 947/948/960. Thus, it is not necessary
to turn the leak detector off or disconnect it from mains power if this is the only procedure
being performed. If you are cleaning the test port in conjunction with other procedures that
require opening the leak detector, be sure to turn the leak detector off, disconnect it from
mains power, and for
Models 948/960
, remove and empty the cold trap.
4.2.9.1 Removing the Test Port
CAUTION
If cleaning the test port in conjunction with performing other
service procedures, turn the leak detector off, disconnect mains
power, and for Models 948/960, remove and empty the cold
trap. Heed all warnings and cautions in the Preface of this
manual.
To remove the test port:
1. Turn the test port tightening nut counterclockwise to loosen it (Figure 4-13), then
remove the tightening nut and the test port plug.
CAUTION
Be careful not to drop the test port plug when you remove the
test port tightening nut. It is deceptively heavy for its size.
Figure 4-13
The Test Port
Test Port Plug
Port Nut
Test Port Tightening Nut
Summary of Contents for 948
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