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Service and maintenance
1.
Connect the T8 to the measuring device and keep an eye on the
pressure signal at any time.
2.
Two steel capillary tubes come out from the T8 shaft: The
refilling tube and the de-airing tube. In a downwards installation
the marked tube is the refilling tube, in an upwards installation
the not marked tube is the refilling tube. Pull off the rubber tube
from the refilling tube.
3.
Connect the tube of the syringe to the refilling tube.
4.
Carefully inject water into the refilling tube until no bubbles come
out of the de-airing tube. Fill in at least 25 ml. Check the
pressure at any time!
5.
Remove the syringe. Put a drop of water on both rubber and
steel tube's end. Connect both.
5.1.4 Refilling with a vacuum pump
To achieve the maximum possible measuring range Tensiometers
can be completely degassed using a vacuum pump. This method
can be applied for installed Tensiometers in any installation angle as
well as for not installed Tensiometers. For refilling tubes longer than
5 meter this method should always be used.
The UMS refill kit BKTex includes all required tools: hand-operated
vacuum pump, vacuum bottle with tube and syringe with valve.
Procedure (see fig. 5.4 & 5.5):
1.
Connect the T8 to the measuring device and keep an eye on the
pressure signal all the time.
2.
In an downwards installation the marked tube is the refilling tube.
In an upwards installation the unmarked tube is the refilling tube.
Pull off the rubber tube from the refilling tube.
3.
Degas the water inside the syringe as described above. Connect
the syringe to the refilling tube and close the valve!
4.
Connect vacuum bottle and de-airing tube. With the vacuum
pump evacuate the bottle to the maximum possible vacuum. This
will enlarge the remaining bubble inside the cup.
5.
Now briefly open and close the valve of the syringe for a few
times: water is drawn into the Tensiometer while at the same
time the air bubble is sucked into the vacuum bottle. Repeat this
2 or 3 times until no bubbles come out anymore.
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