Chapter 8 - Operating Procedures
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MNL000302.doc
Revision 2
01/04/2019
SourceSystemTE11
© Versum Materials, Inc. as of the revision and date shown. All rights reserved.
Confidential and Proprietary Data
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8.4
New System Startup Procedure
In NEC Class I, Division II hazardous
locations (applies only in the U.S.A) do
not apply power to the cabinet controller
until the controller enclosure has been
purged for at least 10 minutes at a
pressure at or above 0.1” H2O (.025
milli-barg) as monitored by the internal
Z purge pressure switch (hazardous
locations only). Refer to steps 3 and 4
below. This complies with NFPA 496
regarding electrical equipment
enclosures. Failure to do so could
result in the ignition of any flammable
gas which may be present.
1.
Verify that the system is ready for startup by completing the startup checklist in the installation
manual. Check, to be sure, that the GASGUARD® system and all plant piping have been leak
checked with a helium mass spectrometer in accordance with the customer's specified
procedure. Check that the GASGUARD® system has been functionally checked after
installation.
2.
Check that the cabinet exhaust system and hazardous gas disposal system (pollution abatement)
are operating.
3.
Verify that house nitrogen pressure is between 85-95 psig (5.9-6.6 barg).
4.
For locations that require Z-purge, turn on and adjust the gas flow to the cabinet controller.
The controller is equipped with a Z-purge pressure switch. The absence of this alarm during Z-
purging indicates that the Z-purge is adequate. If a “Low Z-purge” alarm is present, increase
the flow rate until the alarm can be
.
5.
After purging the controller for at least 20 minutes, turn on electrical power to the controller.
NOTE: The GASGUARD® TE11 system is supplied with an internal controller
purging means that meets NFPA 496, Type Z purging requirements for use in NEC
Class I, Division II hazardous location. Type Z purge does not meet Class I, Division
I NEC requirements.