Hardware manual

4-144 Agilent 7500 Series ICP-MS Hardware Manual
4Maintenance
Removing the Penning Gauge
Use a clean dry surface and gloves. To disassemble the Penning gauge,
complete the following steps:
1 Shut down the instrument.
Refer to Chapter 3, “Startup, Shutdown and Status”.
2 Open the right hood and vent the analyzer vacuum.
Refer to “Working Inside the Vacuum Chamber” in this chapter.
3 Confirm the location of the Penning gauge.
The Penning gauge has a red (with black base) cylinder shaped housing
which fits over the penning gauge tube. The assembly is installed on the
back of the vacuum chamber.
4 Disconnect the Penning gauge cable.
Unplug the connecting cable from the Penning gauge.
5 Remove the Penning gauge from the instrument.
Turn the black base of the Penning gauge housing counterclockwise to
unlock. Then pull the housing out from the Penning gauge tube.
6 Loosen the 3 screws of the plate which locks the Penning gauge tube in
place.
7 Slide the Penning gauge tube down to free it from the locking plate and
remove the tube.
For disassembly and cleaning of the Penning gauge refer to the section
“Cleaning the Penning Gauge”.
Replacing the body tube is recommended in maintaining the Penning gauge.
If you clean and polish the parts inside the body tube, refer to the “Cleaning
the Penning Gauge”.
WARNING
This procedure can expose you to the high voltages of the Agilent 7500, which can be
lethal. Before proceeding, completely shut down the instrument.
NOTE
If the pressure in the vacuum chamber is not equal to the atmospheric pressure, it may be
difficult to remove the Penning gauge.