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The instrument can be calibrated either with a 35 % or 80 % salt solution or a humidity generator. It is recommended that the ambient conditions are at 25 °C. Place the measurement probe in a 35 % salt solution while the instrument is off. Press and hold ON/OFF/SET, START/ESC, MEM/DOWN simultaneously for 3 seconds to enter calibration mode. Press HOLD/UP or MEM/DOWN to select the 35.0 % calibration and press MIN/MAX/AVG/ENTER to stop it. “CAL“ and the calibration value light up on the LCD screen.
WARNING: Do not calibrate the humidity without the standard calibration salt because otherwise serious damage could result. For the calibration salt or other services, contact your dealer.
The sensor has an automatic calibration function to ensure long-term accuracy. If you nevertheless wish to calibrate the sensor, press and hold ON/OFF/SET, START/ESC, MEM/DOWN simultaneously for 3 seconds in off state to enter calibration mode. Press HOLD/UP or MEM/DOWN to select 400 ppm calibration (outdoor air calibration). Press MIN/MAX/AVG/ENTER to enter the mode. “CAL“ and the CO2 value light up on the LCD screen. Wait for about 10 minutes until the display stops flashing and calibration is finished.