To Minimize Foreline Pump Damage From Ammonia (Standard Pump) - Agilent Technologies 5975C TAD VL MSD Troubleshooting And Maintenance Manual

5
CI Maintenance

To Minimize Foreline Pump Damage from Ammonia (Standard Pump)

Air ballasting for an hour every day removes most of the ammonia from the
pump oil. This will greatly increase the life of the pump.
Only perform this procedure if the pump is at normal operating temperature. The water
CA UT IO N
vapor in air can cause condensation of the ammonia at the ballast valve if the pump is
cold.
Procedure

1
Figure 32
2
3
Always purge the flow module with methane after flowing ammonia. The use of
CA UT IO N
ammonia reagent gas also requires that the foreline pump oil be changed every 2 to
3 months instead of the usual 6 months.
166
Turn the ballast valve on the foreline pump
aligned. The sound of the pump will get much louder.
Ballast valve
Minimizing ammonia damage
Leave the ballast valve open for one hour. You can continue to run samples
while the pump is ballasting.
Close the ballast valve by aligning the 0s. Leaving the ballast valve open all
the time will result in loss of pump oil and damage to the pump.
5975 Series MSD Troubleshooting and Maintenance Manual
32) until the 1s are
(Figure