Vaisala HM44 - Manual (Page 42)

User's Guide _______________________________________________________________________
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CHAPTER 10
TROUBLESHOOTING
Erroneous readings
If any of the following points is neglected, the readings may result erroneous. Therefore,
follow these instructions carefully:
• clean the hole carefully (by blowing air or with a vacuum cleaner)
• follow the indications of the recommended hole depths (see page 13)
• make sure that the probe is not colder than the concrete: this causes
condensation on the probe and evaporation may take very long (see
page 6)
• replace worn plastic sleeves
• make sure that the lid of the installation cover and the rubber plug are
carefully closed
• calibrate the HMP44 at regular intervals (see page 35)
• let the probe stabilize (see page 18)
• wait three days after drilling to achieve air humidity equilibrium
Trouble shooting
If there seems to be something wrong with the HM44 or error messages appear on the HMI41
display, please consult the short list next page for trouble-shooting. The HMI41 goes through
a continuous self-diagnostic procedure. If any problems occur, it displays the corresponding
error message:
where nn = the number indicating the error (the first number, here 1, indicates the probe)