Air Products GASGUARD TE10, Installation, Operation And Maintenance Manual, Page: 147 / 196

Section 8: Operating Procedures
Revision – September 2009 8 - 23
8.6.4 General Principles of Manual Operation
Open valves in sequence starting at the first valve downstream of the pressure
source and continuing to the next valve in sequence.
For vacuum operation, open the valve closest to the vacuum source and continue to
open the next valve in sequence.
Close valves in reverse order.
Monitor pressures on the LCD frequently.
Consider all possible consequences before opening or closing a valve.
8.7 Password Security
Multiple levels of password security are used in the controller to prevent
unauthorized operation by untrained personnel.
The first security level allows normal sequence selection, start and stop process
flow, and purge procedures. Access to Manual Mode and the Configuration Menu
is not permitted.
The second security level allows access to Manual Mode and the Configuration
Menu. It permits the user to change certain operating parameters, to view other
menu selections and restricts access to others' files.
The third security level allows access to additional files for changing parameters or
viewing only.
8.8 System Configuration
The configuration menu contains the operating parameters, setpoints and alarm
files that are used to define the operation of the controller. Access to the
Configuration Menu requires a second level or higher password. The security
level determines whether parameters, setpoints, etc in a file can be changed or read
only, or the file is not accessible.