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English 18259
Using up down and enter keys.
When you have selected the function to change, press ENTER to select.
Repeat this to scroll through the menu and select (using the ENTER
key) and change (using the UP / DOWN keys) the function.
The final, logical ENTER returns you to the main menu display.
To exit the Menu function at any time, rotate the dial to another position
- Unless the final logical ENTER is pressed, no changes are made.
Note: in AIR ZERO this mode will continue until terminated by the
pressing of ENTER..
You can choose from the menu, fresh air zeroing which allows CO
2
to
be set to a user defined value (normally 400 ppm in fresh air) and CO
to 0 ppm, Allow a few seconds after each button press for readings to
settle, and then press ENTER to confirm.
Alternatively you can make a menu selection for, and use a TRUE zero
calibration module (if available), which is used to set CO
2
to 0 ppm
(and also CO to 0 ppm).
This mode will take about 40 seconds to operate.
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