Air Products GASGUARD TE10, Installation, Operation And Maintenance Manual, Page: 49 / 196

Section 1: Safety Warnings
Revision - November 2004 Page 1 - 33
1.12 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 Section 1.10).
•
The gas cabinet has a self-closing cabinet door with locking mechanism.
•
Cabinet windows have self-closing 1/4" thick wire reinforced safety glass.
•
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.
•
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.