Trace Oxygen Analyzer Operation
Teledyne Analytical Instruments 31
4.3 The System Function
The sub fuctions of the System function are described below.
Specific procedures for their use follow the descriptions:
• Auto-Cal: Used to define an automatic calibration sequence
and/or start an Auto-Cal.
• PSWD: Security can be established by choosing a 5 digit
password (PSWD) from the standard ASCII character set. (See
Installing or Changing the Password, below, for a table of ASCII
characters available.) Once a unique password is assigned and
activated, the operator MUST enter the UNIQUE password to
gain access to set-up functions which alter the instrument's
operation, such as setting the instrument span or zero setting,
adjusting the alarm setpoints, or defining analysis ranges.
• After a password is assigned, the operator must log out to
activate it. Until then, anyone can continue to operate the
instrument without entering the new password.
• Only one password can be defined. Before a unique
password is assigned, the system assigns TETAI by
default. This allows access to anyone. After a unique
password is assigned, to defeat the security, the password
must be changed back to TETAI.
• Logout: Logging out prevents unauthorized tampering with
analyzer settings.
• More: Select and enter More to get a new screen with
additional sub functions listed.
• Self–Test: The instrument performs a self-diagnostic test to
check the integrity of the power supply, output boards and
amplifiers.
• Version: Displays Manufacturer, Model, and Software
Version of instrument.
• Show Negative: The operator selects whether display can
show negative oxygen readings or not.
• TRAK/HLD: The operator sets whether the instrument
analog outputs track the concentration change during
calibration and sets a time delay for the concentration alarms
after calibration