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Group 3: Humidity
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40xxx
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ProduktName
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Zoom | Type-No.: 3503.0000
Tensiometer
to measure soil moisture, calculated from the difference between ambient air
pressure and reduced pressure in the soil, caused by water tension. Measured by means of a pressure sensor, semi-permeable ceramic sucti on head and water-filled head as transducer.
External refilling. Built-in temperature sensor to measures oil temperature.
Suction head:
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Special ceramic SKA 100-FF
Dimensions: 60 x 24 mm
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Head:
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Length = 80 mm
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Shaft:
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Ø 25 mm, length = 300 mm (standard)
other length up to 2 m upon request
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Measuring range:
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-1000...+850 hPa soil water tension
-30...+70°C soil temperature
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Signal:
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0...2 V soil water tension
0...2 V soil temperature
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Supply:
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6...20 V DC, approx. 7 mA |
Accuracy:
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Soil water tension ± 5 hPa
Temperature ± 0.2 K (-10...+10°C)
respect. ± 0.5 K (-30...+70°C)
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Shaft material:
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Acrylic glass, ∅ 25 mm,
suitable for winter operation at frost protected immersion depth
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Intake f. reference pressure:
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via porous cable membran
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Cable length:
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5 m (standard);
other lengths up to 20 m upon request
8 pole connector IP 67
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Zoom | Type-No.: 3505.2000
Equitensiometer
This instrument is based on a patented method to detect the matric potential in
the soil (Matric potential is an expression for the amount of energy which is
necessary to extract a certain amount, for example 1 gram, of water out of the
soil; its unit is kPa). During equilibrium, the matric potential between neighbouring sections of soil is equal , independent from particle size
configuration, humus content, density etc.. The equitensiometer takes advantage
of this characteristic by getting a ceramic equilibrium probe with known soil moisture characteristic curve in contact with the soil to be measured. After
detection of the probe’ s water content by means of the FDR-principle, the matric potential is directly determined.
Dimensions:
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40 x 20 mm, length 170 mm
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Weight:
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approx. 0.6 kg incl. 5 m cable
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Cable length:
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Standard: 5 m; max. 100 m
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Operating conditions:
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Soil with low salinity
< 1 mS/cm, pH 2...8.5,
temperature 0...40°C
(below 0°C: wrong measuring values, but no damage to the probe)
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Output:
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0...700 mV |
Supply:
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5...15 V DC, max. 23 mA
meas. interval 10 s
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| Application range: |
Precision soil monitoring for hydrology and plant physiology, control of irrigation systems, detection of water stress
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Meas. Range:
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0...-1500 kPa
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Accuracy:
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± 5 kPa at 0...-100 kPa
< 5% at –100...-1500 kPa
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techn. Daten
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