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of Sap Flow Sensors and System Solutions
Quick Start Guide
These precision, water-filled, ceramic cup tensiometers have good accuracy (± 0.2kPa) over the rage +100 to -85 kPa.
The SWT tensiometers require refilling and degassing after dry periods; also, the SWT3 and SWT5 are susceptible to frost damage. These factors can make operation at remote or inaccessible sites impractical. In these conditions and in dry soils, the Equitensiometer should be considered, but for most applications in the 0 to -85 kPa range, water-filled tensiometers are the natural first choice.
The tensiometers require a stabilized 10.6V DC, 1.3mA power source. A DL2e Data Logger, with a TVB1 Voltage Regulator can power and log up to 30 tensiometers (or 60 with special cable arrangements).