Teledyne 2020 - Explosion proof thermal conductivity analyzer - Manual (Page 44)

4 Operation Model 2020
4-10 Teledyne Analytical Instruments
4.3.4 Logging Out
The
LOGOUT function provides a convenient means of leaving the
analyzer in a password protected mode without having to shut the instru-
ment off. By entering
LOGOUT, you effectively log off the instrument
leaving the system protected against use until the password is reentered. To
log out, scroll to field of LOGOUT function, and ENTER to logout The
screen will display the message:
Protected until
password entered
4.3.5 System Self-Diagnostic Test
The Model 2020 has a built-in self-diagnostic testing routine. Prepro-
gramming signals are sent through the power supply, output board, preamp
board and sensor circuit. The return signal is analyzed, and at the end of the
test the status of each function is displayed on the screen, either as
OK or as
a number between 1 and 1024. (See System Self Diagnostic Test in chapter
5 for number code.) If any of the functions fails, the System Alarm is
tripped.
Note: The sensor will always show failed unless identical gas is
present in both channels at the time of the
SELF-TEST
.
The self diagnostics are run automatically by the analyzer whenever the
instrument is turned on, but the test can also be run by the operator at will.
To initiate a self diagnostic test during operation, use the UP/DOWN key to
scroll through the MAIN MENU to the
SELF–TEST and Enter. The screen
will follow the running of the diagnostic.
RUNNING DIAGNOSTIC
Testing Preamp — Cell
When the testing is complete, the results are displayed.
Power: OK Analog: OK
Cell: 2 Preamp: 3
The module is functioning properly if it is followed by
OK. A number
indicates a problem in a specific area of the instrument. Refer to Chapter 5
Maintenance and Troubleshooting for number-code information. The
results screen alternates for a time with:
Press Any Key
To Continue...