Vaisala HMP80 Series, User Manual, Page: 30 / 54

• If you are adjusting in more than one humidity point, make sure the first two points are at
least 10 %RH apart.
• The probe will reject adjustments that are too large, that is, greater than 10 %RH for
humidity and 0.5 °C for temperature. If the probe appears to need such a large correction,
perform a sensor purge and repeat the adjustment procedure. Make sure that the
measurement has stabilized and the reference environment is reliable. If the required
adjustment is still too large, the probe needs to be serviced by Vaisala.
When adjustment of humidity measurement is necessary, Vaisala recommends
adjusting in two points, 11 %RH and 75 %RH. These humidities can be produced
using Vaisala HMK15 Humidity Calibrator.
Adjustment of temperature measurement is typically not necessary.
More information
‣ Calibration and adjustment with Indigo80 handheld indicator (page 30)
‣ Adjusting measurement with Insight software (page 34)
‣ HMK15 Humidity Calibrator with HMP80 series probes (page 35)
7.3 Calibration and adjustment with Indigo80
handheld indicator
The Indigo80 handheld indicator provides two ways to calibrate and adjust measurements for
probes:
Guided calibration and Manual adjustment .
Figure 11 Indigo80 calibration methods for
probes
• Choose Guided calibration when you want the indicator to guide you through the
calibration process step by step. At the end you can also adjust the measurement, if
needed.
• Choose Manual adjustment when you want to freely set the reference and measured
values to adjust the measurement.
HMP80 Series User Guide M212903EN-A
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