The TEROS 31 tensiometer is compact in size and responds quickly, making it particularly suitable for use in laboratories. Its measuring head is only 0.5cm²It can densely measure the water potential distribution of undisturbed soil, as well as measure smaller volume soil samples with minimal disturbance to the soil. The TEROS 31 sensor can be installed in any position and direction, simply drill a 5mm hole with the matching micro spiral drill and insert the tension meter. For over twenty years, METER Germany (formerly UMS) has sold tens of thousands of tensiometer sensors. Based on the T5 sensor with years of R&D and production experience, TEROS 31 has continuously improved. It not only inherits the accurate, sensitive, and compact characteristics of the T5 tensiometer, but also further enhances the compatibility performance of METER related equipment. It can be connected to the ZENTRA Cloud platform for more convenient use.

main features

• Suitable for laboratory samples, including soil columns, soil cores, and ring knife sampling.

• The ultra fast response time is only 5 seconds, requiring a small amount of water for measurement, and can quickly respond to subtle changes in soil water potential.

• The ceramic head at the top of the sensor is only 0.5 cm²Improve accuracy and measurement speed. Narrow measurement spaces are also applicable.

• Minimal disturbance to the soil, only a small hole with a diameter of 5mm needs to be drilled.

• Usually, the range of water potential measurement is 50~-85 kPa. Standardized operation can delay boiling and expand the range of water potential measurement to as low as -150 kPa.

• It can be installed in any direction and at any angle.

• It can be inserted into the soil surface or completely buried in the soil.
  

• 3.5mm headphone jack, plug and play, easy to connect to ZL6 series data acquisition.

• No need for complex settings, view almost real-time data anytime, anywhere through ZENTRA Cloud.

• The transparent shaft is easy to observe.

Technical Parameter

Output:DDI serial port; SDI-12 communication protocol; TensioLINK communication protocol; Modbus RTU Communication Protocol

Compatible with data acquisition (purchased separately):METER ZL6 series, EM60 series, Em50 series, other data acquisition (capable of collecting 3.6-28.0 VDC excitation voltage and supporting SDI-12, Modbus RTU, etc.), Or TensorLink communication)

Size:23.5×17.5×49.0 cm

Tension meter rod diameter:5 cm

Tension meter rod length:2, 5, 7, 10, 15, or 20 cm

Working temperature range:0~50 ℃

texture of material:Ceramic head: Al2O3, Bubble point 500 kPa; Rod body: PMMA； Sensor unit: PMMA and TPE

Cable length:1.5 m

Cable diameter:4.20 ± 0.10 mm

Connection type:3.5mm 4-channel stereo plug

Stereo connector diameter:3.50 mm

Conductor gauge：22 AWG/24 AWG drain wire

Supply voltage (VCC to GND):Minimum: 3.6 V, Typical: 12.0 V, Maximum: 28.0 V

Digital input voltage (logic high):Minimum: 1.6 V, Typical: 3.3 V, Maximum: 5.0 V

Digital input voltage (logic low):Minimum:- 0.3 V, typical: 0.0 V, maximum: 0.9 V

Digital output voltage (logic high):Typical: 3.6 V

Power line conversion rate:Minimum 1.0 V/ms

Current consumption (during measurement):Minimum 18.0 mA; Typical 25.0 mA; Maximum 30.0mA

Current consumption (during static waiting period):Minimum 0.03 mA; Typical 0.05 mA; Maximum 0.90 mA

Start time (DDI serial port):Minimum 125 ms; Typical 130 mm; Maximum 150ms

Start time (SDI-12):Minimum 125 ms; Typical 130 mm; Maximum 150ms

Start time (SDI-12, DDI unavailable):Minimum 125 ms; Typical 130 mm; Maximum 150ms

Measurement time:minimum: 60 ms； Typical: 65 ms; Maximum: 70 ms

Following standards:Produced under IOS 9001:2015 standard, EM ISO/IEC 17050:2010 (CE mark)

Origin and Manufacturer:METER from the United StatesCompany_{(Former Decagon)}