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Filling the device
The tensio shafts "transduce" the matrix potentials (also called tensions) of the
soil sample through their porous ceramic tip and the water filled shaft to the
pressure sensors in the sensor unit. I.e. the tensio shafts provide via their pores
a capillary contact between the water in the tensio shaft and the soil water.
To make sure the pressure is "transduced" precisely no air must be contained
(dissolved or solved) in the water. That is why the tensio shafts and the sensor
unit need to be degassed completely.
For degassing the water you can use two different methods:
1.
by means of the Refill Unit (accessory) makes all necessary
steps simple and is fast.
2.
by means of syringes (basic scope of delivery) takes some
more time and needs more manual work.
In the following either method is described in detail.
22 | Preparing the measurement
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