Vaisala SHM40 - Manual (Page 58)

USER'S GUIDE____________________________________________________________________
56 __________________________________________________________________ M211423EN-B
Problem Situations
Table 7 Some Problem Situations and Their Remedies
Problem Possible Cause Remedy
Probe disconnected.
Connect a HMP40S
probe to the HM40
indicator.
Probe connection loose
or dirty. Disconnect the probe,
check and clean the
connector. Check that
the quick connector on
the HM40 sits tightly.
Reconnect the probe.
Readings on the HM40
screen are replaced by
asterisks ‘*****’.
Very low battery voltage. Check the battery
indicator. Replace
batteries with fresh ones.
The screen is blinking on
and off. Very low battery voltage. Replace batteries with
fresh ones.
The measurement hole
has not been adequately
prepared. The borehole may not
have been cleaned or
sealed during
stabilization. Check and
prepare the hole again. When performing the
humidity measurement in
a borehole, the
measurement is not
stable even after waiting.
The humidity in the
concrete has not
reached equilibrium with
the air in the borehole. The borehole needs a
longer stabilization time.
Re-plug the hole and
measure again later.
HMP40S probe in need
of calibration and
adjustment. Adjust and calibrate the
probe. Measured humidity
reading is much higher
than expected.
HMP40S probe has
been stored in wet
conditions. Allow the probe and
SHM40 case to dry out
before resuming
measurement.
HMP40S probe in need
of calibration and
adjustment. Adjust and calibrate the
probe. Measured humidity
reading is much lower
than expected.
Borehole is not deep
enough. Check the borehole
depth; see section
Measurement Depth on
page 16.