Periodic calibration check
Both the Pt 100 RTD temperature sensor and associated electronics are very stable and should not require any calibration after the initial factory adjustment.
Long term stability of the ROTRONIC Hygromer humidity sensor is typically better than 1 %RH per year. For maximum accuracy, calibration of the HL20 should be verified every 6 to 12 months. Applications where the data logger is exposed to significant pollution may require more frequent verifications.
Note:
Calibrating and adjusting the data logger typically require a humidity-temperature generator or other specialized equipment that may not be available to all users.
Procedure for adjusting the data logger with the ROTRONIC HygroSoft software: Adjustment
Firmware updates
Firmware updates will be available on the Main Page of the HygroSoft for updating. See more here: Firmware Update
Dew point accuracy
The HL20 can be configured to calculate either the dew point or frost point based on the measurement of relative humidity and temperature. The accuracy of this conversion varies, depending on the humidity and temperature conditions as shown in the graph below:
Example: at a temperature of 20 ˚C, a dew point value of -37 ˚C is measured with an accuracy of± 1.0 ˚C or better.
