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Service and maintenance
SWT4 User Manual v3.1
Warning! If the cup is filled with water and water intrudes from
both inside and outside, cavities of air will be trapped inside the
ceramic.
4) Insert the saturated but empty cup to the adapter and connect it to
the degassing device. Place the cup in water in an upright position
with the external water level reaching up to 2/3 of the cup.
5) Half fill the second adapter capsule with water and insert the
sensor body. Connect the adapter to the degassing device as well.
6) Now start the vacuum pump. With well-saturated cups, the
procedure will take 1 to 2 hours. From time to time knock on cup
and sensor body to loosen bubbles. Degassing is complete when
no air bubbles ascend from ceramic and body and the cup is
completely filled with water.
7) Before screwing together cup and sensor body connect the sensor
to a measuring device to observe the pressure signal.
Warning! Do not exceed 2 bar, as 3 bar will destroy the sensor!
Hold the cup in an upright position, fill it completely and with an
overlapping meniscus of water. Carefully and slowly screw the cup
on the sensor body. Allow the excess water to escape. Make sure
that no bubbles are enclosed.
8) Fix the Tensiometer at an angle so the cup is pointing downwards,
and the black mark on the shaft is on top.
9) Degas the water in the syringe as described above and connect it
to the refilling tube (it has a black mark). Do not bend the rubber
tube. Carefully inject water into the refilling tube until no bubbles
come out of the de-airing tube. Inject at least 25 ml. Check the
pressure all the time!
10) Remove the syringe and re-connect the rubber tube to the open
refilling tube.
