Teledyne 3020M - Explosion proof paramagnetic oxygen analyzer - Manual (Page 45)

Percent Paramagnetic Oxygen Analyzer Operation 4
4-9 Teledyne Analytical Instruments
4.7 The SELF-TEST Function
The Model 3020M has a built-in self-testing diagnostic routine. Prepro-
grammed signals are sent through the power supply, output 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 be-
tween 1 and 3. (See System Self Diagnostic Test in chapter 5 for number
code.)
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
SELF-TEST during operation:
Use the DOWN/UP control to scroll through the MAIN MENU to
SELF-TEST . The screen will follow the running of the diagnostic.
RUNNING DIAGNOSTIC
Testing Preamp — 83
During preamp testing there is a countdown in the lower right corner of
the screen. When the testing is complete, the results are displayed.
Power: OK Analog: OK
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 for number-code information. The results screen alternates for a
time with:
Press Any Key
To Continue...
Then the analyzer returns to the ANALYZE screen.
4.8 The SPAN Functions
The analyzer is calibrated using span gas.
For optimum accuracy, we recommend the analyzer be spanned in the
high range with span gas of a known oxygen concentration in the range of
70-90% of full scale.
Connect the calibration gases to the analyzer according to the instruc-
tions given in section 3.5, Gas Connections, observing all the prescribed
precautions.
Shut off the gas pressure before connecting it to the analyzer, and
be sure to control the pressure to about 10 psig when turning it back
on.