Edwards RV3 Instruction Manual

5.2.2 Mode selector
Note:
The pump is supplied with High Vacuum mode selected. If High Vacuum mode S is
selected and the mode selector cannot be turned by hand to select the High Throughput
mode, use a suitable tool ed to the at part of the mode selector to turn the selector.
The mode selector controls the ow of pressurised oil to the high vacuum stage of the
pump (see Mode selector on page 11). The can be turned to one of two posions, as
follows:
To select the High Vacuum mode S, turn the mode selector fully clockwise and ghten
by hand. When High Vacuum mode is selected, there is a gap of approximately 3 mm
between the mode selector and the inner face of the side panel of the pump. Use this
mode:
▪
to achieve ulmate vacuum
▪
to pump clean gases
▪
to pump clean condensable vapours.
To select the High Throughput mode S, turn the mode selector fully anclockwise unl it
touches the inner face of the side panel of the pump, then gently ghten by hand. Use
this mode:
▪ for long-term operaon with high gas throughput (that is, inlet pressure >
50 mbar)
▪
to pump dirty condensable vapours
▪ to decontaminate the oil.
5.2.3 Gas-ballast control
Use the gas-ballast control to change the amount of air (or inert gas) introduced into the
low vacuum stage of the pump (refer to Gas-ballast control on page 12). Use of gas-
ballast will prevent the condensaon of vapours in the pump. The condensates would
contaminate the oil. The gas-ballast control can be turned to select one of three
posions, as follows:
To select gas-ballast closed, turn the control to posion ‘0’. Use this seng:
▪
to achieve ulmate vacuum
▪
to pump dry gases.
To select low ow gas-ballast, turn the control to posion ‘I’. Use this seng:
▪
to pump low concentraons of condensable vapours
▪
to decontaminate the oil.
To select high ow gas-ballast, turn the control to posion ‘II’. Use this seng:
▪
to pump high concentraons of condensable vapours.
When using either low ow or high ow gas-ballast, there will be an increased rate of oil
loss from the pump. Where possible, we recommend that low ow gas-ballast (posion
‘I’) is selected, rather than high ow gas-ballast (posion ‘II’), to minimise the loss of oil.
03/2021 - ©Edwards Limited
Page 36A65201880_AA
A65201880_AA - Operaon

Edwards RV3 Specifications

General

Brand	Edwards
Model	RV3
Category	Water Pump
Language	English