Delta Ohm Wireless Data Logging System HD35EDWK/4TC

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

Ensure the chamber contains the following

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

Avoid contact of the sensitive element with hands or other objects or liquids

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

Ensure the environment is unoccupied during calibration

Record the current CO2 concentration in the environment

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

Apply offset to make the measured value coincide with the background value if within maximum offset

Apply maximum offset to approach the background value if difference is higher than 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

Select the option OK and confirm with ENTER

Wait for a few minutes for measurement completion