EN – 43
EN
Maintenance
This is the case when, for example, a mineral oil is replaced by a synthetic oil (e.g. A120
by A113).
Synthetic oils are considered to be incompatible with each other for practical reasons:
they are expensive. A mixture may cause slight cloudiness of the resulting mixture,
which could be interpreted mistakenly as a sign of contamination or deterioration.
For the same reasons, clear synthetic and mineral oils (A300), which are also expensive,
are treated as synthetic oils.
These remarks apply to ester or fluorocarbon type synthetic oils and the oils A111,
A113 and A300 (
see page 17
).
Proceed as follows
:
Disassemble the pump completely and clean it (
see page 46
).
Reassemble it.
Connect an oil mist eliminator to the pump exhaust.
Fill the pump (oil case and sealed housing) with the new oil (
see page 17
).
NOTE
: to replace a synthetic oil by a mineral oil, proceed as for compatible oils.
Incompatible oils
In all cases, follow the recommendations of the pump integrators for the
choice of the oil to be used.
Change of type of oil
(cont’d)
Using noise limiter
•
Set pump to normal operating condition (temperature, ambient sound level, etc.).
•
Connect a liquid nitrogen trap and a Penning gauge to pump inlet.
•
Check the direction of rotation.
•
Remove fill exhaust port) and unscrew gas inlet tube with a screwdriver all the way
out.
•
Run pump for about one hour at ultimate pressure.
•
When the pump is hot,
screw in tube, half a turn at a time, monitoring partial
pressure and sound level (wait 3 to 4 minutes after each half turn). When the desired
noise level is set, replace the exhaust port to evaluate the sound level.
Start-up after pump
disassembly or oil
change
The principle of the noise limiter is described page 9. It is adjusted at the
factory when the pump is checked and need only to be readjusted after:
- pump disassembly-reassembly operations,
- changing the oil type (not all oils are miscible in the same proportions with
pumped gases).
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