10.Zeroing

Because usage environments vary, there are many factors that may affect the performance of the gas detector, including temperature and humidity changes as well as dust. If the ambient air is not clean, gas readings might be inaccurate. For optimal performance, zero the gas detector once every 24 hours or after changing of environmental conditions.

1. From the main reading screen, click the button twice in rapid succession to enter the menus.

2. Click the button until you see Zero.
3. Press and hold the button down for [verify this time, it is more than 1 sec] second. The instrument counts down and then performs a zero calibration.
4. A progress bar indicates that the instrument is being zeroed.

• If the instrument passes zeroing, the message “Passed” appears
• If the instrument fails zeroing, the message “Failed” appears.

If the instrument passed the zero calibration, it automatically reverts to the main reading screen after 10 seconds.