Techno Line WL 1030 Manuel D'utilisation page 17

1) Press the "MEM" button (C3) one at a time to view the maximum =>
minimum record of the CO2, temperature and humidity (MAX or MIN icon
appears) and then the 15-minute => 8-hour time weighted average of the
CO2 level (15 M or 8Hr appears at the lower LCD).
Note: You need to power on your monitor for at least 15 minutes to display
the relevant last 15-minute weighted average of CO2 level (and also power
on 8 hours to display the last 8-hour weight average).
2) When the Max / Min /15-M / 8-Hr reading is being displayed, press and
hold the "MEM" button (C3) to reset all records (A4, all digits on the display
become "----") and your monitor will start to store data for the next 24-hour
period.
To calibrate the CO2 sensor
This monitor is factory calibrated to a 400 PPM CO2 standard
concentration.
Caution: Do not manually calibrate the monitor in an environment of
unknown CO2 concentration.
Automatic baseline calibration: Your monitor is equipped with a smart
chip so that it will automatically calibrate itself to reduce the drift of the CO2
sensor for long time usage. It will calibrate itself automatically at the
minimum CO2 reading detected during 7 days of continuous monitoring.
Note: Make sure the place you put your monitor at is well ventilated (with a
CO2 level near 400 PPM) for at least one hour everyday, or you move the
monitor to such a well ventilated room for a few hours everyday to perform
Automatic Baseline Calibration.
Manual calibration of the CO2 sensor
1) Place your CO2 monitor in a 400 PPM calibration surrounding. Power it
on and wait for a few minutes until the first CO2 reading is displayed. Then
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