© Edwards Limited 2007. All rights reserved. Page 5
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Installation
D357-25-880 Issue E
3 Installation
3.1 Unpack and inspect
Remove all packing material and protective covers and check the ASG.
If the ASG is damaged, notify your supplier and the carrier in writing within three days; state the Item Number of the
ASG together with your order number and your supplier’s invoice number. Retain all packing materials for inspection.
Do not use the ASG if it is damaged.
If the ASG is not to be used immediately, replace the protective covers. Store the ASG in suitable conditions as
described in Section 6.
3.2 Fit the ASG to the vacuum system
The ASG can be mounted in any orientation. To avoid the build-up of debris or condensable material in the body tube
of the ASG we recommend that you install the ASG vertically as shown in Figure 2.
To connect the ASG to your vacuum system:
z Use an O-Ring / centring ring or Co-seal and clamp to connect an NW16 flange to a similar flange on the
vacuum system.
z Use a stepped O-Ring carrier or Co-seal to connect an ASG with a NW16 flange to a NW10 flange.
z Use PTFE tape for 1/8 inch NPT connection.
3.3 Electrical connections
When using a cable longer than 30 m, full compliance with the EN61326 requires an in-line surge suppressor (please
refer to Section 7.2).
3.3.1 Connect to Edwards controller
Connect the ASG to the controller using an adapter cable and an active gauge cable (refer to Section 7).
3.3.2 Connect to your own supply and control equipment
Note: Do not connect the electrical supply common to the signal common. If you do, the ASG output signal will
be inaccurate.
If connection is to be made using the 4 pin DIN connector, the pin allocations are as shown in Figure 3.
If the ASG malfunctions, the ASG pressure output may be incorrect. If such a failure could cause
injury to persons or damage equipment, you must install a suitable control system to indicate the
failure and, if necessary, to close down your process system.
Pin number Use
1 Electrical supply positive voltage
2 Electrical supply common
3 Pressure measurement output signal
4Output common
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