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

ICTGT3-30 Pressure Transducer -100 to 200 kPa

The ICTGT3-30 sensor measures in the range of -100 to +200 kPa. The vacuum inside the tensiometer is measured by the highly precise pressure transducer (ICTGT3-30), which gives a continuous output signal to the STM Soil Tension Meter. A resolution of 0.1 kPa (1 cm H2O) can be attained for the ICTGT3-30 Tensiometer Transducer.

GT3-30 Tensiometer Transducer -100 to 200 kPa Features

  • Pressure and suction measurements (-100kPa to +200kPa)
  • Rapid response
  • Temperature compensated in the range 0–50°C — typical shift 0.5% full scale.
Range: -100kPa to +200kPa
Signal: At input 10.0 V output signal is: -100 kPa = -50 +/- 3 mV and +200 kPa = 100 +/- 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

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 GT3-30 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