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, UMS has sold tens of thousands of such sensors, and based on years of experience, the TEROS 31 tension meter has been continuously improved to possess the characteristics of accuracy, sensitivity, and compactness.
Main Features
Tension meter suitable for laboratory use
Small in size and quick to react
Minimal disturbance to soil
Can be installed in any direction at any position
Bubbles in water management can be easily detected
The output signal is balanced
Accurate at 0 o'clock
Measuring principle
The soil water potential can be transmitted to the inside of the sensor through a ceramic cup, causing changes in water pressure inside the sensor. The pressure sensor located inside the sensor outputs a simulated signal to obtain the corresponding water potential.
technical indicators
| total length | 4cm+sensor rod length |
| Current consumption | ~1.3 mA@ 10.6 V |
| Rod body and ceramic cup | Customizable length, standard 70mm |
| power supply | 10.6 VDC (5 - 15 VDC), stable |
| diameter | Rod diameter: 5mm; Sensor diameter: 20mm |
| Principles of Electronics | Asymm. Wheatstone bridge |
| Body material | acrylic glass |
| sensor | Piezoresistive pressure sensor; Maximum withstand pressure ± 300 kPa |
| stability | Typical drift<0.5% p.a |
| Cable | Standard 5m, other lengths can be customized |
| temperature drift | Temperature compensation, typical drift of 0.5% FS over 25 K |
| scope | +100 ~ -85 kPa (ca. pF 2.9) minus shaft/cup length: 1 cm = 0.1 kPa |
| resolution | 0.1kPa |
| accuracy | ± 0.5 kPa |
| impedance | ~2.5 kOhm |
| signal | When excited at 10.6V, 100kPa is -100 ± 3 mV; -85 kPa is 85 ± 3 mV |
| Compatible with data collection | ZL6 series |
Origin and manufacturer: GermanyMETERcompany(formerly UMS Germany)
