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Trouble shooting
7
Trouble shooting
Problem
1. It is not possible to achieve a
bubble free filling.
2. The Tensiometer readings only
rise very slowly
3. The Tensiometer reaches a
maximum of -50 kPa, then the
reading drops
4. The Tensiometer shows readings
beyond vacuum (-100 kPa)
5. The curve cannot be fitted
6. The recording of readings has
stopped
7. Tensiometer reach only -50 to -70
kPa, then readings drop slowly
Possible cause and solution
If the tip is completely dry just put
the empty shaft in a beaker with
deionised
or
overnight.
a)
Could depend on the soil type:
for example sand has a poor
conductivity. Thus, the curve of
the readings will be flatter than
for example in a clayey soil.
b)
The Tensiometer is not
sufficiently filled and degassed
(see 1)
c)
A leakage has occurred (see 3)
The Tensiometer is not sufficiently
filled and degassed (see 1).
The shaft was not properly screwed
onto the pressure body, and the O-
ring is not tight. Reassemble the
shaft.
This is no error but a particular
feature of the miniature
Tensiometer. Due to boiling
retardation it is possible that the T5
might reach values up to -140 kPa.
Please check fig. 51 for this effect.
a)
Reset start and stop line as
described in the chapter „End of
the measuring campaign".
b)
The curve progression is not
consistently rising, eventually it
is necessary to start a new
measurement (causes see
point 3)
Check the USB connections
In the power management menu of
your PC or laptop disable the power
down and select non-stop operation.
The Tensiometer was not
sufficiently filled. A bubble
assembles inside the ceramic part
67/92
distilled
water
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