Edwards EXS Series - Install Additional Safety Equipment; Purge Gas Set up; High Flow Purge and Solvent Flush Set up

5.13 Install addional saf
ety equipment
WARNING:
If the con
trol system needs to know the total ow rate of purge gas to the dry
pumping system for safety reasons, install suitable measurement equipment in the
purge gas supply pipeline.
WARNING:
If the gas purges are used to dilute dangerous gases to a safe level, ensure that the
dry pumping system shuts down if the purge gas supply to the dry pumping system
fails.
If the total ow rate of purge gas to the dry pumping system is required to be known for
safety reasons, suitable measurement equipment should be ed in the purge gas
supply pipeline. If ng a rotameter, ensure that it is suitable for use with the purge gas
and that it is correctly calibrated.
Ensure that the installaon is congured so that it remains safe if there is a failure of the
purge gas supply to the dry pumping system.
If an alarm condion is detected, the dry pumping system will shut down automacally.
Ensure that the installaon remains safe if the dry pumping system shuts down
automacally.
5.14 Purge gas set up
For the dry pumping system, the sha seal purge is always on. The HV sha seal purge is
default set to high vacuum mode to keep high ulmate performance of the pump. It can
be adjusted to high ow mode by the manual valve (MV3, refer to Rear view on page 12)
when necessary, ulmate performance might be aected when MV3 is set to this mode.
There are also two manual valves for gas ballast control, they were set at the close
posion as default. Dierent gas ballast ow rate can be achieved by adjusng MV1 and
MV2 manually, for details refer to Table: Gas system ow opon.
5.15 High ow purge and solvent ush set up
WARNING:
By de
fault the DP clean high ow purge and solvent ush assembly draws the
atmospheric air into the dry pumping system. If air is not compable with your
process then nitrogen or another inert gas may be used. It is your responsibility to
assess whether the DP clean purge gas is compable with the process.
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allaon