6. Calibration and Adjustment6.1 Calibration and Adjustment OverviewYou can calibrate and adjust the transmitter using the following tools:• Push buttons on the transmitter motherboard• Serial line commands• Portable humidity meters HM70 and HMI41A calibrator kit is needed for calibration against saturated salt solutions. The HMK15 HumidityCalibrator and pre-measured certified salts are available from Vaisala. For further information,please contact your Vaisala representative.Vaisala Service Centers also offer accredited calibrations for humidity and temperature.You can also remove the HMP110 probe and replace it with a new one. The old probe can beadjusted using another transmitter body, if you have one available.RH Field Calibration and Adjustment, as instructed in this document, is restrictedto a certain adjustment range to minimize the effects of special circumstances,such as chemical contamination. In case the probe is outside its adjustment/trimrange due to, for example, chemical exposure, the calibration cannot becompleted. In this case, it is recommended that you change the probe or contactVaisala Services.More Information‣ Push-Button Calibration (page 53)‣ Calibration Commands (page 34)‣ Adjusting RH and T with MI70 Hand-Held Indicator (page 56)‣ Adjustment with HMI41 (page 60)HMT120 User Guide M211244EN-C52
