Teledyne 3000ZA2G - Zirconium oxide analyzer - Manual (Page 51)

Trace Oxygen Analyzer Operation
Teledyne Analytical Instruments 39
Then the analyzer returns to the initial System screen.
4.3.6 Version Screen
Move the ◄►arrow key to More and press Enter. With Version
blinking, press Enter. The screen displays the manufacturer, model, and
software version information.
4.3.7 Showing Negative Oxygen Readings
For software version 1.4.4 or later, the instrument only displays
oxygen readings that are positive or zero. The instrument can be
reconfigured to show negative readings if sensor output drifts below
zero. This situation may arise after the instrument has been zeroed, as
time progresses the sensor may drift below the zero calibration setpoint.
To show negative oxygen readings on the display:
Press the System key.
TRAK/HLD Auto-Cal
PSWD Logout More
Use the Right or Left arrow keys and select More. Press Enter.
Version Self-Test
Show_Negative=NO
Use the ◄► arrow keys and select “Show_Negative=NO”.
Use the ▲/▼ keys to toggle from NO to YES.
Press the Escape key twice to return to the analyze mode.
This preference is stored in non-volatile memory, so this
configuration is remembered after a power shutdown. If the instrument
is cold started, it will go back to default (not showing negative oxygen
readings).