User's Guide ______________________________________________________________________
180 _________________________________________________________________ M211296EN-A
Sending for Calibration
Every 12 months, send HMP155 to Vaisala for calibration and replace it
with a calibrated spare probe:
1. Remove the old probe from inside the radiation shield.
2. Check the operation of the new probe by warming the sensor head
with your hand, and monitor the value change.
3. Place the new probe inside the radiation shield.
4. Send the old probe to Vaisala for calibration.
Or, if a calibrated spare probe is not available, do the following:
1. Send the probe to Vaisala for calibration.
2. When the calibrated sensor arrives from Vaisala, check the
operation of the probe by warming the sensor head with your hand,
and monitor the value change.
3. Place the probe inside the radiation shield.
Calibration must always be done when there is reason to believe that the
device is not within the accuracy specifications.
Changing HMP155
Contact Vaisala to replace HMP155.
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