Models 947, 948 and 960 Leak Detectors Operations and Service Manual
B-26
B.5.2 Dry System
B.5.2.1 Removing the Dry System Forepump
To perform this procedure:
1. Disconnect the mains power supply and make sure that all pumps are off.
WARNING
Disconnect power from the 947/948/960 before performing any
maintenance procedure that requires physically disconnecting
any part of the system.
CAUTION
Models 948/960 only:
Remove, empty, and clean the cold trap
whenever power is removed. Refer to “Liquid Nitrogen Cold
Trap (Models 948/960 only)” on page 4-10.
WARNING
To avoid injury, use proper lifting techniques when moving
pumps. Your system may have pumps that require two people
to move them safely.
2. Remove the front panel.
3. Remove the right side panel.
4. Disconnect the power plug of the pump from the 947/948/960.
The plug is located behind the turbo and is best accessed from the right panel.
5. Remove the NW25 clamp from the left manifold.
6. Remove the centering ring and O-ring. Place them on a clean surface.
B.5.2.1.1 Removing the Isolation Valve from the Forepump
To perform this procedure:
1. Remove the VPI valve.
2. Remove the NW25 clamp from the top of the pump.
3. Disconnect the NW25 clamp at the opposite end of the valve.
Summary of Contents for 948
Page 175: ......
