Preventive maintenance for HMP155 includes:
- Checking that the probe is securely mounted.
- Checking that the radiation shield and cable are intact.
- Cleaning the radiation shield using mild detergent and a soft, lint-free cloth.
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Changing the probe filter once a year.
If the measurement site is exposed to air pollution and dust, the probe filter may need to be changed more frequently. - Sending the sensor to Vaisala for calibration once a year.
- Sending the sensor to Vaisala for calibration if the sensor readings seem inaccurate.
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Do not pull the T‑probe cable from HMP155. The cable is fixed to the circuit board. 
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