CAUTION:
Do not touch the ang
e heater or surrounding surfaces during the bakeout process as
they will be hot.
NOTICE:
Pumps with ISO ang
es are not suitable for bakeout, only pumps with CF anges
must be used. When baking the pump to above 70 °C at the inlet ange, the pump
must be water cooled to prevent damage to the bearing lubricant.
The Edwards ange heater may be used to heat the pump (refer to Accessories). Fit the
appropriate band around the pump CF inlet ange. When baking the pump or the
system, make sure that the temperature of the inlet ange does not exceed the values
specied in .
When baking the vacuum system, if the temperature of the system exceeds 200 °C, put a
radiaon shield between the system and the pump. This radiaon shield will reduce the
heat radiated onto the pump rotor.
Typically, a bakeout of four hours is long enough to remove water condensaon from the
pump. However, the bakeout me will depend on the amount of condensaon in the
pump and the vacuum system, and the ulmate pressure desired.
7.10 Shut down the pump manually
Note:
In an emergency only, open the ven
t valve quickly to decelerate the pump rotor in the
shortest possible me.
Use this procedure to shut down a basic, manually-controlled pumping system with a
manual vent valve.
1. Turn o the pump, but keep the backing-pump on and backing v
alve open.
2. When speed has fallen to 50%, open the vent valve.
3. When the pump reaches standsll, the vent valve and backing valve may be closed
and backing pump switched o.
08/2021 - ©Edwards Limited
Page 88B8J200880_D
300812671_002_C3
B8J200880_D - Operaon
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