To Pump Condensable Vapours; To Decontaminate The Oil; Unattended Operation - Edwards RV3 Instruction Manual

3. Turn the mode selector to select High Vacuum mode S and close the gas-ballast
control (position '0').
Open the vacuum system isolation-valve and pump down to ultimate vacuum.

5.5 To pump condensable vapours

Use gas-ballast (gas-ballast control in position 'I' or 'II') when there is a high proportion
of condensable vapours in the process gases.
1. Close the vacuum system isolation-valve.
2. Turn the mode selector fully clockwise to select High Vacuum mode S or fully
anticlockwise to select High Throughput mode S , as required (refer to
selector
3. Turn the gas-ballast control to high flow (position 'II') and operate the pump for
30 minutes to warm the oil; this will help to prevent vapour condensation in the
pump.
4. Set the gas-ballast control to the position required for the application (refer to
ballast control
mode
5. Open the vacuum system isolation-valve.
After pumping condensable vapours, decontaminate the oil if necessary: use the
procedure in

5.6 To decontaminate the oil

The oil in the pump should be clear; if the oil is cloudy or discoloured, it is contaminated
with process vapours.
1. Look at the condition of the oil in the oil-level sight-glass
item 8). If the oil is cloudy or discoloured, continue with the procedure at Step 2
below.
2. Close the vacuum system isolation-valve.
3. Turn the mode selector fully anticlockwise to select High Throughput mode S . Set
the gas-ballast control to low flow (position 'I').
4. Operate the pump until the oil is clear.

5.7 Unattended operation

The RV pump is designed for unattended operation under the normal operating
conditions specified in
recommend checking the pump at regular intervals of not more than 14 days, or more
frequently if pumping high volumes of gas or vapour.
On single-phase pumps, the motor is protected by an overload device which isolates the
pump from the electrical supply when critical temperature or current levels are
exceeded. The overload device resets automatically when the motor has cooled. When
checking the pump, make sure that the pump is not going through a repetitive cycle of
thermal overload failures and automatic resets. If necessary, change the mode selector
to High Throughput mode S and reduce the thermal load from the pumped gases, to
prevent overheating of the pump.
A65201880_AA
A65201880_AA - Operation
on page 36).
on page 36 and the data in
and Table: Performance data- High throughput
To decontaminate the oil
Operating and storage conditions
Page 38
Table: Performance data- High Vacuum
mode).
on page 38.
on page 13. However, we
Mode
(Figure: The RV pump,
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Gas-