Chapter 5 - Features and Components
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MNL000626.doc
Revision 0
06/25/2019
Chemical Equipment
© Versum Materials US, LLC. as of the revision and date shown. All rights reserved.
Confidential and Proprietary Data
Page 5
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Versum Materials Confidential
5.1.4 Installation in Classified Locations
The ChemGuard
®
is approved for use in NEC (National Electric Code) Class I, Division 2
(U.S.A) and ATEX Zone (Group) 2, Category 3 (Europe) classified locations provided that the
controller Type Z purge in enabled.
The Type Z purge is required to maintain a positive pressure of Nitrogen at or above 0.10 in.
W.C. as dictated by the National Fire Protection Agency (NFPA) and European directives
(ATEX). In applications where Type Z purge is required, the controller will be equipped with a
pressure switch to monitor the presence of purge gas. The Type Z purge will require a flow
rate of approximately 5.5 LPM.
5.1.5 Z-Purge Setup and Procedure
The Z purge pressure is controlled by a needle valve at rear of controller. After opening the
controller in a suspected hazardous area it is necessary to use the following procedure to re-
establish the Z-purge before operating the controller:
1.
Close the controller door and secure latch completely.
2.
Open the needle valve 4 to 5 turns (counter-clockwise). Allow the controller to purge
for 30 minutes at 5.5 SLPM flowrate.
3.
Flow requirements to operate the solenoid valves are very small, less than 1 LPM (2
CFH). If Type Z purge is required, a flow rate of 5.5 LPM will be needed, depending
on the tightness of the individual controller and the installation.
5.2
Component Description
The ChemGuard® GenIII consists of these major subassemblies:
•
Chemical Cabinet
•
Controller Electronics Enclosure
•
Emergency Manual Stop (E-Stop)
•
LED VGA Color Touch Display Screen
•
Optional Versum Material 38 liter bubbler with built in coolant jacket
NOTE:
If a customer provided LPE 14 liter bubbler is used the customer is
responsible to provide this bubbler. It is not available from Versum Materials.
