© Edwards Limited 2020. All rights reserved. Page 7
Installation
D14643880 Issue L
3 Installation
3.1 Unpacking and inspection
Remove all packing materials and protective covers and check the Active Inverted Magnetron Gauge for damage. If
the gauge is damaged, notify your supplier and the carrier in writing within three days; state the Item Number of the
unit together with your order number and your supplier’s invoice number. Retain all packing materials for inspection.
Do not use the gauge.
Note: Please consult your supplier in case of any difficulty.
3.2 Connection to the vacuum system
The gauge body tube terminates in a NW25 flange. To connect to a tube terminating in a NW25 flange, an O-ring, a
centring ring (or Coseal) and clamp will be required.
The gauge can be mounted in any orientation, however in order to avoid the build up of condensable material /
liquids in the body tube (causing probable reading errors) a vertical attitude is preferred; the face of the flange
should be horizontal and the body tube vertical so that the flat end of the case is facing upwards.
3.3 Positioning the gauges
The gauges should be mounted as close as possible to the point at which the pressure is to be measured. Use a short
connecting tube with an internal diameter not less than that of the gauge tube. Long, narrow and angled connections
can cause a significant reading error.
3.4 Electrical connection
Figure 2 shows how the gauge should be connected to an external power supply and voltmeter. Refer to Section 2.6
for full specification of the power supply. A voltage between 13.5 - 36 V should be applied between pins 1 and 2 of
the connector. Connect the gauge before switching ON. Pin 7 must be connected to 0 V to enable the high voltage
supply as shown in Figure 2. (The Edwards Active Pirani Gauge can be used to enable the gauge at the correct pressure
by suitable connection of its set-point output).
WARNING
The AIM gauge incorporates magnets. Keep away from heart pacemakers, computers, credit cards
and any other magnetically sensitive devices.
WARNING
Magnetic Field may interfere with pacemakers. Maintain a distance of minimum 10 cm between
the magnet and the heart pacemaker. You can also use anti-magnetic shield to prevent the
influence of strong magnetic field.
WARNING
If the electronics are disconnected from the body tube and the body tube is left connected to a
vacuum system, then if a plasma discharge is maintained in the system in the vicinity of the body
tube, the anode and guard ring of the body tube assembly may become charged up.
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