Operating principles of the TEROS 12 soil and substrate humidity and electrical conductivity probe
The TEROS 12 Soil and Substrate Moisture and Electrical Conductivity Probe is the basic soil and substrate humidity, temperature and electrical conductivity (EC) sensor manufactured by METER Group.
The 70 MHz working frequency minimizes the effects of salinity and soil texture, improving precision in different types of soil and substrates.
With a durable epoxy body, the TEROS 12 Soil and Substrate Electrical Conductivity and Moisture Probe is designed to withstand harsh field conditions and water intrusion.
Ideal for large sensor networks and substrates, it is sensitive to small changes in volumetric water content (VWC) over the entire range of soil and substrate water content.
The new design of the TEROS 12 Soil and Substrate Electrical Conductivity and Moisture Probe makes it easy to install in any condition, from dry desert soils to wet peat.
Influence volume of the TEROS 12 Soil and Substrate Moisture and Electrical Conductivity Probe
The TEROS 12 Soil and Substrate Moisture and Electrical Conductivity Probe offers the largest volume of influence on the market.
With 9.4 cm stainless steel spikes, the TEROS 12 probe has an influence volume of 1010 mL around the spikes (compared to 200 mL for most sensors).
Adjusting the calibration function to improve the accuracy of the TEROS 12 humidity probe
A very important feature of the TEROS humidity probe that allows you to use specific calibration functions for different types of soil and substrates.
In this way, measurement accuracy can be improved with scientific criteria.
A robust and accurate second generation capacitive probe
The TEROS 12 soil and substrate humidity and electrical conductivity probe has a temperature sensor inside the central spike, giving robustness and high sensitivity and response speed to changes in soil or substrate temperature.
The high-quality stainless steel spikes glide easily into the soil, even on dry, compact soil.
The sensor body is manufactured from high quality epoxy, providing high durability in field conditions.
The TEROS 12 humidity probe contains the electronics within the robust epoxy body. The sensor spikes are made of high quality and robust stainless steel.
Ensuring correct installation on unaltered soil and better contact with the environment.
Quick and systematic installation in any scenario and thus eliminate data uncertainty
The installation process of the humidity probes must be carried out correctly to guarantee good contact and that the soil structure is not altered.
Installing the probes through a side hole made with an auger is valid for any type of soil (even hard clay) while minimizing disturbance of the medium.
The new deep installation auger for TEROS soil moisture probes is robust and easy to use.
In this way, the installation of the probes at depths of up to 1.8 meters is facilitated through an 8cm diameter side hole made with an auger.
It is advisable to install the sensors straight and perpendicular to the ground surface, exerting uniform pressure and avoiding the presence of air pockets.
Specifications TEROS 12
| Contenido Volumétrico de Agua (VWC) |
| Calibración de suelo mineral: |
0,00 – 0,70 m3/metro3 |
| Permitividad dieléctrica aparente (εa): |
>1 (aire) a 80 (agua) |
| Resolución: |
0,0010 metros3/metro3 |
| Exactitud: |
Calibración genérica: |
± 0,03 m3/m3 (± 3.00% VWC) típica en suelos minerales que tienen solución EC <8 dS / m |
|
Calibración específica del medio: |
±0,01–0,02 m³/m³ en cualquier medio poroso |
|
Calibración de suelo mineral: |
±0,03 m³/m³ típico en suelos minerales que tienen solución EC <8 dS/m |
|
Permitividad dieléctrica aparente (εa): |
1-40 (rango del suelo), ± 1 εa (sin unidades) 40-80, 15% de la medida |
| Frecuencia de medición dieléctrica: |
70 MHz |
| Temperatura: |
Rango: -40 a 60 ºC Resolución: 0,1 °C Exactitud. ±1 ºC |
| Conductividad Eléctrica (ECb) |
Rango: O a 20 dS/rn (volumen) Resolución: 0.001 dS/m Exactitud: +/- (5% +0.01 dS/m) desde O a 10 dS/m +/- 8% desde 10 a 20 dS/m |
| Salida: |
Serie DDI o protocolo de comunicación SDI-12 |
| Dimensiones: |
Longitud: 5,1 cm Ancho: 2,4 cm Altura: 7,5 cm |
| Compatibilidad Datalogger: |
Dataloggers METER (ZL6, series EM50/60) o cualquier sistema de adquisición de datos con capacidad de 4 a 15 VCC y comunicación serie o SDI-12. |
| Longitud del cable: |
5 m (estándar) Conector estéreo de 3,5 mm o cables pelados y estañados |
| Tensión de alimentación (VCC) a GND: |
Mínimo: 4,0 VDC Máximo: 15,0 VDC |
| Duración de la medición: |
Mínimo: 25 ms Máximo: 50 ms |
Applications of monitoring humidity and electrical conductivity of soil and substrate
Monitoring of humidity, temperature and electrical conductivity of soil and substrates in field and laboratory tests.
Sensor networks.
Programming and management of irrigation in hydroponic and substrate crops.
Salinity and EC monitoring and fertilization management.
Learn best practices for a borehole soil moisture sensor installation using the TEROS Borehole Installation Tool and TEROS Soil Moisture Sensors.
Video: TEROS Soil moisture sensor installation best practice video - METER Group
