Filling With Vacuum Pump - UMS Hyprop User Manual

Get ready to start a measuring campaign
4.2.4

Filling with vacuum pump

If you have a vacuum pump you may use this for degassing sensor
unit and shafts.
To do so, place the empty Tensiometer shafts in a beaker with
deionised water. Do not fill any water inside the shaft! The water
should only been drawn up from the outside into the inside. Only this
will ensure that no air bubbles are trapped inside the ceramic.
Connect rubber tubes to the shafts. Connect the tubes to a vacuum
bottle, and the vacuum bottle to the pump.
Attach the acrylic filling attachment(s) to the sensor unit (without the
tube). Use the droplet syringe to fill up the attachments with
deionised water. Now connect the each sensor unit attachment to
the vacuum system.
Start the pump and evacuate the system for at least 2 hours. For
best results, do this for 24 hours. The vacuum pump does not
necessarily has to run continuously. It might be better to re-establish
the vacuum in intervals. Knock against the sensor unit every time
you switch on the pump to loosen any bubbles.
Fig. 30 customized vacuum system made by UMS
31/92