Typical Applications; Extended Measuring Range Of The T5X - UMS T5 User Manual

Introduction
1.6.3

Typical applications

Typical applications of the T5 and T5x:

Punctual measurement of water potential

Miniature soil column studies, e. g. in combination with micro
water samplers and soil temperature probes

Determination of pF/wc and K/Psi in soil columns, soil cores
or soil sampling rings

Determination of leachate and capillary water movements

Controlling irrigation

Pot experiments

Measurements in the upper soil horizons in the field

Monitoring with data loggers

Spot readings with the INFIELD7
For in the field applications it might be recommendable to use T4,
T4e or T8 Tensiometers.
1.6.4

Extended measuring range of the T5x

The special version T5x is tested to reach a measuring range of
-160 kPa when delivered. To achieve this, the T5x requires an
absolutely bubble free filling.
You might notice that your T5x might even go down to -250 kPa
before running empty, sometimes even to -450 kPa, but this is an
exception and cannot be guaranteed.
The T5x is identical with the T5 but has a different ceramic. The
extended measuring range is made possible by the effect called
boiling retardation, the special ceramic with smaller pores and, as a
necessary condition, an absolutely gas free filling.
Do not allow the T5x ceramic to dry out by leaving it unprotected
in air: by drying out the tension might reach the destructive
pressure.
Due to the finer pores of the ceramic the water conductivity is
lower. Therefore the response of a T5x is slower than with a
standard T5.
When the shaft is touched it might warm up. This might cause a
short time change of the pressure.
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