S WT4 Rugged Soil Tensiometer
• Excellent accuracy in wet and irrigated soils
• Easy refill model available
A precision, water-filled, ceramic cup tensiometer with good accuracy (±0.5kPa) over the range +100 to -85 kPa. The SWT-4 Tensiometers contain water in the cup only, which gives improved frost resistance.
SWT-4 models require refilling and degassing after dry periods, the SWT-4R models can be refilled once installed
Please note: sensor cable length 2.5m from ceramic cup to 4-pin plug M12/IP67. Ceramic cup 6cm x 24m diameter
Applications
Applications include monitoring crop water stress, irrigation scheduling and tracking gradients of hydraulic potential when analysing directions and rates of water flow.
Their ability to respond to positive hydraulic heads allows them to monitor water table height when submerged (and the overburden, if present).
The SWT range of tensiometers requires a stabilised 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).
Alternatively, a GP1 Data Logger, fitted with up to two GP1-PBA-X50 adapter board can log 1 or 2 tensiometers
Ordering information
SWT4-t40 Rugged Tensiometer
Length 20cm to 120cm
SWT4-t150 Rugged Tensiometer
Length 121cm to 211cm
To order a different length, change the final digits in the code, e.g. for 100cm length, order SWT4-t100.
SWT4R-t40 Rugged Tensiometer (with external refilling)
Length 20cm to 120cm
SWT4R-t150 Rugged Tensiometer (with external refilling)
Length 121cm to 211cm
To order a different length, change the final digits in the code, e.g. for 100cm length, order SWT4R-t100.
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