Edwards AIM Instructions

Active Inverted Magnetron Gauge - Electrode Kit
These instructions are applicable to the following: AIM Electrode Kit (Item Number D145-45-802), AIM-SL Electrode Kit (Item Number
D145-48-802).
1 Dismantle the AIM Gauge
1. Hold the body tube and magnet housing in separate hands.
2. Push the components together and turn the magnet housing anti-clockwise (relative to the body tube) to release the bayonet-type
locking mechanism, then separate the two components keeping their centre lines in-line.
2 Dismantle the tube
1. Unscrew and remove the white collar: take care not to bend the protruding anode assembly pin.
2. Remove the anode: keep the centre line of the tube and anode in-line. Ensure that you do not bend the anode pin.
3. Remove the Viton™ 'O' ring.
4. Use circlip pliers to remove the circlip from the other end of the tube.
5. Remove the cathode from the tube.
3 Reassembly
Reassemble the components as described in
A cathode plate is at one end of the cathode tube. This plate should be at the collar end (that is, the opposite end to the
vacuum flange). When you reassemble the AIM Gauge, make sure that the long pin end of the anode enters the centre hole in
the cathode plate.
Before you screw in the collar, check that the anode pin is central within the line of view through the central hole in the
cathode tube.
When you fit the new anode assembly, you must check the gaps between the striker plates and the shield and ensure that they
are correctly set as shown in
Viton™ is a trademark of DuPont Dow Elastomers L.L.C.
Instructions
Section 2 but in the reverse order. Note that:
Figure 1 below.
Figure 1 - Striker plate/shield gap settings
D145-45-840
Issue C Original
1. Striker plate
2. Shield
3. Striker plate (not fitted
on all anode assemblies)