Delta Ohm Wireless Data Logging System HD35EDNTV

Ensure the environment is unoccupied during calibration

Record the current CO2 concentration level

Enter the background CO2 concentration value

Is the difference between the measured value and the background value lower than the maximum offset?

Apply offset to match the measured value with the background value if within maximum offset

Apply maximum offset to approach the background value if difference exceeds maximum offset

Place the instrument in an environment with known CO2 concentration (e.g., in clean air)

Wait for at least 15 minutes for the measurement to become stable, with the instrument on

Access the menu with the administrator password and select Calibration -> CO2 calibration

Record the value measured by the instrument (left side)

Enter the calibration value (right side)

Select OK and confirm with ENTER

Unscrew the probe protection grid and screw the M12×1 threaded ring

Dry any liquid inside the measuring chamber with a clean absorbent paper towel

Unscrew the cap of the saturated solution

Screw the threaded ring with the probe on the saturated solution container and wait for at least 30 minutes

Access the menu with the administrator password and select CAL_MENU or Calibration

Leave the instrument pressure input open

Access menu with the administrator password

Select the item CAL_MENU -> DIFF_PRES_0 Pa_CAL

Press ENTER to confirm selection

Is the zero value blinking on the display?

Press ENTER to store the calibration