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Service and maintenance
8
Service and maintenance
8.1 Testing
8.2 Check the HYPROP
1. First check if the Tensiometers of the HYPROP need to be refilled
(recommended always at initial use and after a complete
measurement campaign):
Connect the sensor unit with adapter cable and USB-converter to
®
your PC and start tensioVIEW
.
2. Click on the magnifying glass symbol to search for devices.
Select the sensor unit you want to check.
3. Click on "Refilling" to open the
"Refilling window".
Check the Zero point
If the tips are moist both readings
should be around 0 hPa (between -
5 and + 5 hPa).
If you have not done the zero set
(compensation of water column) the
values are higher due to the shaft
length.
Check the Response
Wrap a dry paper towel around one ceramic tip to create a
momentary dry ceramic surface. Now create an air current around
the ceramic cup, e. g. by waving a sheet of paper. The reading
should rise to -80 kPa within seconds. If this is the case, the
Tensiometer is filled correctly. If not, the Tensiometers needs to be
refilled.
Do the same with the second tip.
8.2.1
Calibration
When delivered the HYPROP transducers (Tensiometers) are
calibrated with an offset of 0 kPa (when in horizontal position) and a
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