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Settings and Calibration Model 7500ZA
Teledyne Analytical Instruments 68
6.7 Maintenance Mode
This mode is used to check sensor input values,
display of error log or setting of passwords, etc. This is
a password protected area. To access the maintenance
mode, enter the correct password from the Parameter
Setting/To Maintenance screen.
1. Select the Maintenance Mode from the
Parameter Setting screen to display the
Password Setting screen.
2. Enter the password, and the Maintenance Mode
item selection screen will be displayed. Point
the cursor to the item you want to set by
pressing the UP or DOWN key and then press
ENT.
Note: “To Factory Mode” is for TAI’s service
engineers only.
3. Press the ESC key to return to the Maintenance
Mode item selection screen from each screen.
6.7.1 Sensor Input Value screen
There are 5 possible inputs on the Model 7500ZA:
1. Input 1 to 4 : NDIR sensor digital value
2. Input 5 : O2 sensor digital value
6.7.2 Error Log screen
This screen displays the error history and logs the
last 14 instrument errors.
See Section 8.1 Error Message for specific
information regarding error number and its meaning.
To clear an error from the log, select Clear Error
Log and press the ENT key. The specific entry will be
removed from the list.