© Edwards Limited 2018. All rights reserved.
Page 15
Operation
A732-01-880 Issue D
4
Operation
4.1
Use of gas ballast control
The XDS100B booster does not have a gas ballast option; condensation is not likely to occur in the pump, as the normal
operating pressure is too low.
4.2
Start up procedure
CAUTION
A fine dust may be emitted from the exhaust of the scroll pump during start up, particularly when the pump is
new or if new tip seals are fitted. Refer to
for further information when fitting new tip seals.
To pump down large volumes from atmospheric pressure, the backing pump should be started first, and the booster
should be started only when system pressure has fallen to 100 mbar. For small volumes (<15 litres), it is acceptable
to start both pumps simultaneously.
Use the following procedure to start the pump:
1. Ensure that any vacuum system isolation valve is closed (if fitted).
2. Connect a suitable lead from the power supply to the appliance inlet at the side of the pump.
3. Switch on the electrical supply to the pump, using the Run/Standby switch. Item 8 on
4. With manual operation always use the Run/Standby switch to start and stop the pump. If remote operation is
used to control the pump, refer to
.
5. Open the vacuum system isolation valve (if fitted).
4.3
To achieve ultimate vacuum
In order to achieve the best possible vacuum the primary pump backing the booster should be operated without the
gas ballast. If atmospheric moisture is present run the backing pump with the gas ballast control for 20 minutes
before removal of the gas ballast.
4.4
To pump condensable vapours
Due to the low pressures throughout the XDS100B mechanism condensation is not likely within the booster pump.
Please refer to the instruction manual of the booster backing pump for recommendations of gas ballast configuration
for vapour handling.
WARNING
Ensure that the system design does not allow the exhaust pipeline to become blocked.
