SWT4 User Manual v3.1
Introduction
5
1 Introduction
1.1 Safety instructions and warnings
Electrical installations must comply with the safety and EMC
requirements of the country in which the system is to be used.
Please note that any damage caused by handling errors are out of our
control and therefore are not covered by guarantee.
Tensiometers are instruments for measuring the soil water tension, and
soil water pressure and are designed for this purpose only.
Please pay attention to the following possible causes of risk:
Lightning: Long cables act as antennas and might conduct surge
voltage in case of lightning stroke
– this might damage sensors
and instruments.
Frost: Tensiometers are filled with water and therefore are
sensitive to frost! Protect Tensiometers from frost at any time.
Never leave Tensiometers over night inside a cabin or car when
freezing temperatures might occur!
Tensiometers are not usually damaged when the cup is installed in
a frost-free soil horizon.
Excess pressure: The maximum non destructive pressure is
300 kPa = 3 bar = 3000 hPa. Higher pressures - which might
occur, for example, during insertion in wet clayey soils, whilst
measuring shear force, or during refilling and reassembly - will
destroy the pressure sensor!
Electronic installation: Any electrical installations must be executed
by qualified personnel.
Ceramic cup:
Do not touch the cup with your fingers
. Grease,
sweat or soap residues will influence the ceramic's hydrophilic
performance.
