Updated:2023-02-22
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Laboratory tensiometer
Easy data visualization in real time: plug and play with ZL6 logger and ZENTRA Cloud
Small and fast
Little soil disturbance
Extended range
Install tensiometer in any position or orientation
Bubbles easily detectable through the transparent shaft
Output signals are balanced
Accurate zero-tension reading
Measurement Specifications | Water Potential | Range: –85 to +50 kPa (up to –150 kPa during boiling retardation) |
Resolution: ±0.0012 kPa | ||
Accuracy: ±0.15 kPa | ||
Temperature | Range: –30 to +60 °C | |
Resolution: ±0.01 °C | ||
Accuracy: ±0.50 °C | ||
NOTE: If the sensor unit is not buried, measured temperature may diverge from soil temperature. | ||
Communication Specifications | Output |
DDI serial SDI-12 communication protocol TensioLINKTMcommunication protocol ModbusTMRTU communication protocol |
Data Logger Compatibility | METER ZL6 and EM60 data loggers or any data acquisition system capable of 3.6- to 28.0-VDC excitation and SDI-12, Modbus RTU, or TensioLINK communication. | |
Physical Specifications | Dimensions |
Width: 23.5 mm (0.93 in) Height: 49.0 mm (1.93 in) Depth: 17.5 mm (0.69 in) |
Tensiometer Shaft Diameter | 5 mm (0.19 in) | |
Tensiometer Shaft Length | 2, 5, 7, 10, 15, or 20 cm | |
Materials |
Ceramic:Al2O3, bubble point 500 kPa Shaft: PMMA Sensor Unit: PMMA and TPE |
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Operating Temperature Range |
Minimum: 0.00 °C Maximum: 50.00 °C |
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Cable Length | 1.5 m | |
Cable Diameter | 3.0 mm (0.12 in) | |
Connector Types | 4-pin stereo plug connector | |
Stereo Plug Connector Diameter | 3.5 mm | |
Conductor Gauge | 31 AWG drain wire | |
Electrical and Timing Characteristics | Supply Voltage (VCC to GND) |
Minimum: 3.6 VDC Typical: 12.0 VDC Maximum: 28.0 VDC |
Digital Input Voltage (Logic High) |
Minimum: 1.6 V Typical: 3.3 V Maximum: 5.0 V |
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Digital Input Voltage (Logic Low) |
Minimum: -0.3 V Typical: 0.0 V Maximum: 0.9 V |
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Digital Output Voltage (Logic High) | Typical: 3.6 V | |
Power Line Slew Rate | Minimum: 1.0 V/ms | |
Current Drain (During Measurement) |
Minimum: 18.0 mA Typical: 25.0 mA Maximum: 30.0 mA |
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Current Drain (While Asleep) |
Minimum: 0.03 mA Typical: 0.05 mA Maximum: 0.90 mA |
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Power Up Time (DDI Serial) |
Minimum: 125 ms Typical: 130 ms Maximum: 150 ms |
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Power Up Time (SDI-12) |
Minimum: 125 ms Typical: 130 ms aximum: 150 ms |
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Power Up Time (SDI-12, DDI Serial Disabled) |
Minimum: 125 ms Typical: 130 ms Maximum: 150 ms |
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Measurement Duration |
Minimum: 60 ms Typical: 65 ms Maximum: 70 ms |
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Other | BARO Module | When using the METER tensiometers TEROS 31 and TEROS 32 in combination with a non-METER data logger, a highly accurate barometric compensation is needed to get the most precise soil water potential measurement. The BARO Module can be used as a stand-alone sensor for measuring atmospheric pressure at a measuring site. It is also available with different connectors, so the BARO Module can be connected directly in between a tensiometer and a data logger. BARO Module can also act as a digital/analog converter to connect a tensiometer with serial output to a data logger with analog input channels. The logger obtains a barometric compensated analog matric potential signal. The BARO Module can be used for varied logger communications: SDI-12, Modbus, tensioLINK, analog voltage signal. |
Compliance |
Manufactured under ISO 9001:2015 EM ISO/IEC 17050:2010 (CE Mark) |
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