Agilent Technologies 1100 Series Reference Manual page 42

Results
Troubleshooting
Results
Troubleshooting
Troubleshooting
If the Status Lamp is Yellow and the Vacuum Pump Runs Continuously
A pressure reading below 500 mV indicates a good functioning vacuum
pump.
A pressure reading above 600 mV indicates that one of the pump chambers is
contaminated or defective. In this case, disconnect the sensor tube (position
9) and let the pump run without load for 5 minutes.
Reconnect the sensor tube (position 9) and repeat the measurement. If the
correct vacuum is obtained the contamination has been flushed away and the
vacuum pump is functioning correctly.
If the pressure reading is still above 600 mV, the vacuum pump should be
replaced (see "Exchanging the Vacuum Pump" on page 57).
6 Switch the degasser back to normal operation modes by turning SW1 back
to 0.
7 Properly reconnect the tubings.
Eliminate the solenoid valve as the source of the problem.
1 Disconnect the solenoid valve tube at position 6.
2 Disconnect the sensor assembly tube at position 4.
3 Connect the sensor assembly tube at position 6.
4 Switch degasser into continuous mode by turning SW1 to 1.
If the obtained pressure reading is similar to the result from the previous
measurement (see above) when testing the pump (below 500 mV), the
solenoid valve is functioning correctly.
If the obtained pressure reading is different (above 500 mV) from the results
obtained when testing the pump (see above), the solenoid valve is defective
and needs replacing (see "Exchanging the Solenoid Valve" on page 59).
5 Switch the degasser back to normal operation modes by turning SW1 back
to 0.
6 Properly reconnect the tubings.
Eliminate the vacuum chamber 1 as the source of the problem.
1 Disconnect the solenoid valve tube at position 6.
2 Remove the vacuum pump and place it on the top of the vacuum chamber
3 Disconnect the solenoid valve tube at position 9.
4 Switch the degasser into continuous mode (SW1 to 1).
5 Disconnect the vacuum chamber 2 tube at position 2 and plug it.
42