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13.12 Tensiometer FDA 602 TM2

13.12 Tensiometer FDA 602 TM2
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Moisture in the soil • Measurement of soil moisture through the identification of suction pressure. The suction pressure is the force with which water is being held in the soil or is available for absorption. This is the force that must be produced by the plant roots in order for water to be absorbed. • The porous, clay tip of the tensiometer transfers water from within to the drier outer surroundings by means of capillarity, thereby, creating a sub-pressure within the sealed tensiometer tube. This sub-pressure is a measure of the moisture level and can be determined as a value or used directly to activate an electrical switch. The customary unit of measurement is hPa. • However, a tensiometer also functions in dry air as long as evaporation can take place over the porous, clay chamber. Therefore, moisture levels can be measured even in coarsegrained or very loose substrate. • Suction pressure measurements are largely independent of the salt concentration of the substrate or soil. Typical Suction Pressure at Peat Substrates 30 - 40 hPa very moist 50 – 120 hPa moist 150 – 200 hPa dried >200 hPa dry Measure range: Output Power supply Cable Cylindrical, with tip, Ø 15 x 40 mm approx. 210 mm typical 120 mm Cylindrical, with tip, Ø 15 x 40 mm approx. 160 mm typical 70 mm Cylindrical, with tip, Ø 20 x 65 mm approx. 340 mm typical 250 mm Ceramic cell Overall length Insertion depth Measurement of soil moisture through the identification of suction pressure. 0 to -1000 hPa relative (negative pressure) 0,5 to 4,5 V 5 V via ALMEMO® connector Sensor with cable, length = 5m, with ALMEMO® connector Tensiometer electronics for screwing onto the tensiometer with cable and ALMEMO® connector Ceramic cell Overall length Insertion depth Moisture tension meter, electronics Ceramic cell Overall length Insertion depth Typical Suction Pressure at Open fields (intermediate grade soil) < 50 hPa saturated 100 – 150 hPa wet to moist >200 hPa start drying 200 – 500 hPa Irrigation Technical Data Sensor completely porous for measuring in thin layers of substrate. Dimensions: 65 mm, Ø 70 mm Sink deep: approx. 30 - 60 mm Standard model for use on capillary matting, for moist to moderately moist cultivation or for general measurement on moist surfaces. Dimensions: 65 mm, Ø 70 mm 01/2015 • We reserve the right to make technical changes.

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