Service and maintenance
70/92
linear response. The offset of the pressure transducer has a minimal
drift over the years. Therefore, we recommend to check the
HYPROP sensor unit once a year and re-calibrate them every two
years.
Return the HYPROP sensor unit to UMS for recalibration If
necessary.
8.2.2 Check the Offset
Screw off the Tensiometer shafts. Carefully blow out remaining water
from the shaft drillings. Connect the sensor unit to tensioVIEW
®
and
continuously observe the readings.
Wait until the readings are stable. The readings should be between
-0.2 kPa and +0.2 kPa. If the readings are beyond this range a re-
calibration might be necessary.
8.3 Cleaning
The sensor unit is rated IP65 and can be cleaned under running
water, but pay attention that the cover of the plug connector is
closed.
Clean ceramic and shaft only with a moist towel. If the ceramic is
clogged it may be flushed with Rehalon®.
If the pores are clogged with clay particles saturate the ceramic and
then polish the ceramic surface with a wetted, waterproof sandpaper
(grain size 150...240).
8.4 Storage
If the HYPROP should not be used for a year or more empty shaft
and sensor head to avoid algae growth. Store both in a dry place.
