TEROS 22

soil water potential sensor



overview

The newest generation of matric water potential sensor is now the quickest water potential sensor to install and remove, with the same high accuracy and low maintenance you’ve come to expect and trust from METER. Over 40 years of experience has  brought us to the next evolution of simple and precise water potential measurements — Introducing the TEROS 22.

features
  • Easy to install and remove
  • Install via 16 mm (5/8 in) drill hole or in the side of a trench
  • Tough, long-lasting body
  • No recalibration needed
  • Low salt sensitivity
  • Affordable
  • Excellent range (sensitivity from 0 kPa all the way to air dry [-100,000 kPa])
  • Onboard temperature measurement
  • Plug-and-play capability
  • Use with the ZL6 data logger for remote access to data on the cloud
  • DDI Serial and SDI-12 compatible

 

continuous monitoring with seasonal flexibility

Choose an instrument that conforms to your installation needs instead of compromising your research. While trenching at installation and removal works for some, it is limiting for research areas such as agricultural environments and geotechnical engineering projects. That’s why the TEROS 22 is designed with the flexibility to be installed with a drill-mounted masonry bit or the traditional trenching method, making water potential measurements available to just about any application. Keep the sensor in place for years at time for continuous monitoring or remove seasonally, giving you the flexibility to adapt to changing plans and work around seasonal agricultural schedules.

 

a true full-range water potential sensor that’s low maintenance and low-cost

The TEROS 22 water potential sensor is incredibly easy to use. It requires no maintenance, and it’s accurate enough for most applications. In fact, the TEROS 22 provides an even more accurate soil moisture picture than measuring water content alone. Plus, unlike water content, matric potential isn’t dependent on soil type, so you can compare moisture between different sites. Just like the TEROS 21, the TEROS 22 is surprisingly affordable and measures all the way from near saturation to air dry (0 to −100,000 kPa) making them both true full range water potential sensors.

 

measure more within your budget

We offer them at a low cost so you don’t have to spend more money to get the coverage you need. And, because they use less energy and include a temperature sensor, you get even more value.

 

whole system monitoring solutions

Edaphic Scientific is a one-stop shop for a whole system monitoring solution. We provide plant and soil monitoring systems for researchers and growers.

Our systems not only support soil sensors, but related sensors such as sap flow, dendrometers, weather parameters, and more.

At Edaphic Scientific we want to work with you from the start of your project through to its completion. We can provide:

Assistance with project and experimental design
Procurement of all monitoring equipment, including sensors, data loggers and data management software. Edaphic Scientific is a one-stop shop where we can source and find any necessary equipment for your project from our preferred suppliers or third party suppliers

 

Installation and training

On-going assistance with data interpretation and equipment maintenance
Data correction and analysis, including statistical analysis with the R-package
Report and publication preparation, including tables, figures, graphs, and manuscript writing

 

advanced data collection and management solutions

Edaphic Scientific recognises the need for flexible and adaptable sensor and data-logging solutions for experimental or environmental monitoring projects.

Data can be downloaded directly in the field from data loggers. A direct connection between the data loggers and your computer, via a USB cable, can be used for manual downloading of data.

Alternatively, data can be downloaded over the internet on your iPhone, iPad or desktop computer with the Sensori cloud-based, data management software solutions. Through this remote based downloading capabilities, you can download, view and manage your data, and system, anywhere in the world and at anytime.

 

 

 

video

 

 

specifications

feature specification
Measurement Specifications
Water Potential Range: 0 to –100,000 kPa (1.70 to 6.00 pF) Resolution: 0.1 kPa Accuracy: ±(10% of reading + 2 kPa) from –100 to –5 kPa NOTE: TEROS 22 can read up to 0 kPa when on a wetting path. The air entry of the soil limits the performance of the sensor to –5 kPa on the drying curve. NOTE: TEROS 22 is not well calibrated beyond –100 kPa. For more information on using the TEROS 21 beyond this range, see Section 3.3.3 in the user manual
Dielectric Measurement Frequency 70 MHz
Temperature Range: –40.00 to +60.00 °C Resolution: 0.10 °C Accuracy: ±1.00 °C
Communication Specifications
Output DDI serial or SDI-12 communication protocol
Data Logger Compatibility METER ZL6 and EM60 data loggers or any data acquisition system capable of 4.0- to 15-VDC power and serial or SDI-12 communication
Physical Specifications
Dimensions Diameter: 1.7 cm (0.67 in) Length: 17 cm (6.7 in) Length with optional extensions: 40, 40, and 120 cm (15.7, 31.5, and 47.3 in)
Sensor Diameter 1.7 cm (0.67 in)
Operating Temperature Range Minimum: –40.00 °C typical: NA Maximum: +60.00 °C NOTE: Sensors may be used at higher temperatures under certain conditions; contact Customer Support for assistance.
Cable Length 5 m (standard) 75 m (maximum custom cable length) NOTE: Contact Customer Support if a nonstandard cable length is needed.
Connector Types Stereo plug connector or stripped and tinned wires
Connector Size 3.50 mm
Conductor Gauge 22-AWG \ 24-AWG ground wire
Electrical and Timing Characteristics
Supply Voltage (VCC to GND) Minimum: 4.0 VDC Typical: NA Maximum: 15.0 VDC
Digital Input Voltage (Logic High) Minimum: 2.8 V Typical: 3.6 V Maximum: 5.0 V
Digital Input Voltage (Logic Low) Minimum: –0.3 V Typical: 0.0 V Maximum: 0.8 V
Digital Output Voltage (Logic High) Minimum: NA Typical: 3.6 V Maximum: NA
Required Supply Current Minimum: 15 mA Typical: NA Maximum: NA
Power Line Slew Rate Minimum: 1.0 V/ms Typical: NA Maximum: NA
Power Up Time (DDI Serial) Minimum: NA Typical: 100 ms Maximum: 350 ms
Time before sensor is responsive to SDI-12 commands (DDI serial enabled) Minimum: NA Typical: 260 ms Maximum: 500 ms
Time before sensor is responsive to SDI-12 commands (DDI serial disabled) Minimum: NA Typical: 170 ms Maximum: NA
Measurement Duration Minimum: NA Typical: 50 ms Maximum: NA
Other
Compliance EM ISO/IEC 17050:2010 (CE Mark) EN 55011:2016 / A1:2017 (RCM Mark)

manual & docs

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