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Optimal measuring curve
Every measurement runs in 4 phases provided that tensio shafts and sensor
unit are filled air free.
Phase 1, regular measurement range
Tension value curve rises up without flattening until it reaches the boiling point
of the water.
Phase 2, boiling delay phase
In the ideal case – when the system is filled completely air free – the tension
value rises up to the boiling delay area (above the ambient air pressure). This
is nice to have but in general not necessary for the evaluation.
Phase 3, Cavitation phase
Water vapor is generated in the tensio shaft and the tension value drops abruptly
down to the boiling point. After this the tension value decreases only slightly.
Phase 4, Air entry phase
The tension value again drops abruptly – now to zero, as air penetrates the
ceramic. The air entry point is a material characteristic of the ceramic and
amounts to about 8800 hPa (880 kPa). This point can also be used for the
evaluation.
61 | Optimal measuring curve
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