Chapter 1 - Safety Warnings
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MNL000294.doc
Revision 2
09/16/2016
Source System TE11
© Versum Materials, Inc. as of the revision and date shown. All rights reserved.
Confidential and Proprietary Data
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1.13 Equipment Safety Features
Dependent on the design of your specific system, the following safety features may be incorporated
into the GASGUARD® system:
Warning labels and gas identification labels are placed on the outside door of each cabinet (see
Chapter 1 Section 12).
The gas cabinet has a self-closing cabinet door with locking mechanism.
A sprinkler head is installed in the source system, unless water is a hazard with the specific gas
used in the source system.
Cabinet doors have self-closing 1/4" thick wire reinforced safety glass windows.
Fault and Shutdown alarms notify the operator through the alarm horn, light and alarm label on the
controller of a problem with the system. In addition, the Shutdown alarms close all pneumatic
valves and abort the controller program.
Excess flow sensors are installed, when required, to shut off the flow of gas in the event of
downstream equipment failure.
An exhaust monitor verifies ventilation through the cabinet.
The system may utilize a positive shutoff regulator. This type of regulator is designed to close
tightly if the pressure builds above the setpoint because the diaphragm is mechanically connected
to the valve poppet. Be aware that the regulator may leak if the regulator seat is damaged,
corroded or soiled.
A flow restricting orifice may be installed in the cylinder valve. This flow restricting orifice
significantly reduces the flow of gas in the event of a failure in the downstream equipment.
An ultraviolet infrared (UVIR) detector may be installed for pyrophoric gas systems. A
temperature switch is required in lieu of a UVIR detector for pyrophoric gas systems.
A temperature switch is required for flammable gas systems.
Pressure relief valves may be incorporated into the design to prevent overpressurization of the
process line and downstream equipment and to protect the inert purge system.
Manual operation access is denied during the presence of a shutdown alarm.
An "EMERGENCY STOP" pushbutton is located on the controller panel.
A password security system prevents unauthorized personnel to operate or modify the
GASGUARD® controller menu.