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Enabling better global research outcomes in soil, plant & environmental monitoring.

GT3-15 Tensiometer Transducer -100 kPa to 100 kPa

The vacuum inside the tensiometer is measured by a pressure transducer, which gives a continuous analogue output signal. A resolution of 0.1 kPa (1 cm H2O) can be attained for the GT3 Tensiometer Transducer.

GT3-15 Tensiometer Transducer -100 kPa to 100 kPa Features

  • Pressure and suction measurements (+100kPa to -100kPa)
  • Rapid response
  • Temperature compensated in the range 0–50°C — typical shift 0.5% full scale.

For alternative ranges of Tensiometer transducers see here.

 

Utilising the GT3-15 Tensiometer Transducer sensor in a custom IoT (Internet of Things) package

The SNiP-GT3 is a ‘Sensor Node Integrated Package’ for LoRaWAN or CAT-M1 communication of real-time soil tension measurements for continuous soil monitoring.

The base SNiP-GT3 integrates an MFR-NODE and 1x GT3-15 Transducer to a site’s unique network, communication and power requirements. The MFR-NODE can support an added 1x GT3-15 Transducer to monitor soil moisture at multiple depths.

The GT3-15 Transducer couples with a preferred Jet Fill Tensiometer (see available lengths here).

Measuring Principle

The soil water tension is transmitted via the ceramic cup into the tensiometer. The vacuum inside the tensiometer is measured by a pressure transducer, which gives a continuous analogue output signal.

Resolution and Accuracy

A resolution of 0.1 kPa (1 cm H2O) can be attained for the GT3 Tensiometer Transducer.
The accuracy actually obtained is related to the calibration and resolution of the AD converter. In field applications the values obtained should consider the shaft/cup length of the tensiometer: 1 cm = 0.1 kPa.

Transducer GT3-15 connection


Red: +10 V power supply

Yellow: Signal output “+”
Pressure change from 0 to -100 kPa
Output from 0 to -100 mV

Black: Battery ground

Blue: Signal output “-”
Do not connect signal output “-” to battery ground

Range: +100kPa to -100kPa
Signal: Ratio Metric to its supply voltage. Differential Output. At input 10.0 V output signal is: -100 kPa =  -100 +/- 3 mV and 0 kPa = 0 +/- 3 mV
Temperature shift: Temperature compensated in the range 0–50°C—typical shift 0.5% full scale.
Voltage output: Transducer has a 4 wire output signal.
Resolution: 0.1 kPa
Accuracy: ±1.0% span

Power Requirements

Power Supply: 10.0 V DC typical, 16.0 V maximum stabilised
Current consumption: 1.3 mA @ 10.0 V