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Section 5 • Maintenance/Service
Installation of The Oil Sampler Valve:
1. Lubricate the threads (1/4"-18 NPT) with Teflon
tape.
2. Tighten to the max. torque 25 ft-lbs (34 N-m). Use
11/16" open wrench. Avoid over tightening.
:
Pre-Sampling
Use the Vilter Oil Analysis Kit (VPN 3097A) to collect an
oil sample for analysis, see Figure 5-2.
Once the sample has been taken, the label must be
filled out and pasted on the bottle, and both must be
placed inside the mailing tube and sealed with the pre-
addressed mailing label.
Below are a few points to remember when taking a
sample:
•
Sample running compressor units, not cold units.
Sample after minimum 30 minutes of compressor
operating time.
•
Sample after the oil filter.
•
Sample according to the sampling procedure below.
•
Ensure sampling valves and devices are thoroughly
flushed prior to taking a sample.
•
Ensure samples are taken as scheduled in the
Maintenance and Service Schedule.
•
Send samples to the oil analysis lab immediately af-
ter sampling, do not wait 24 hours.
Figure 5-2. Oil Analysis Kit (VPN 3097A)
5 – 8
VSS/VSM/VSH/VSSH • Installation, Operation and Maintenance Manual • Emerson • 35391SD
Sampling Procedure
THE SAMPLING PRESSURE RANGE IS LIMITED BETWEEN
5 TO 750 PSI (0.03 – 5.17 MPa). IF THE OPERATING
PRESSURE IS ABOVE 750 PSI (5.17 MPa), THE OIL
SAMPLING MUST BE DONE WHEN THE COMPRESSOR IS
NOT RUNNING AND ENSURE THE SYSTEM PRESSURE IS
WITHIN THE 5 TO 750 PSI (0.03 – 5.17 MPa) SAMPLING
RANGE.
A 1/4" NPT oil sampling valve is provided either in the oil
filter canister cover or in the piping after the filter (See
Figure 5-3 or 5-4(a) according to application).
1. Unthread the oil sampling valve cap. For valve
#3709A, you also need to turn the knurled locknut
clockwise, see Figure 5-4 (b).
DO NOT remove the valve from the piping or filter
housing.
2. Remove the cap of the oil analysis bottle and posi-
tion it carefully under the valve spout. (Make sure
the valve spout is rotated to the downward position)
SLOWLY AND VERY CAREFULLY press the "PUSH
BUTTON" with your finger to open the valve, and re-
lease the button to close it, see Figure 5-5.
WARNING
If the valve is opened too rapidly, a foamy pressurized
jet of oil will gush out and splash outside the container.
Figure 5-3. Oil Sampler Valve (VPN #3708A)
For Gas Compression Applications
NOTE
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Troubleshooting
