Soil can be highly variable in space, requiring numerous measurements and frustrating amounts of your research dollars. Not to mention the extra cost and hassle of replacement sensors if you need long-term data. Make long-term, large sensor networks simpler, longer-lasting, and more affordable with the ultra-dependable TEROS 11 soil moisture and temperature sensor.
Utilising the TEROS-11 sensor in a custom IoT (Internet of Things)
The SNiP-TER1 is a ‘Sensor Node Integrated Package’ for LoRaWAN or Cat-M1 communication of real-time soil moisture and temperature measurements, for continuous soil monitoring.
The base SNiP-TER1 integrates 1x S-NODE and 1x METER Group TEROS-11 soil moisture sensor to a site’s unique network, communication and power requirements. The S-NODE can support an added 3x TEROS-11 devices.
The culmination of our new TEROS water content line, the TEROS 11 makes your life easier with a large volume of influence, reduced sensor-to-sensor variability, and a near-bulletproof form factor—which lasts up to 10 years in the field. These innovations, along with our well-published capacitance technology, an accuracy verification standard, and a blazing fast installation tool have combined to generate our most accurate, easy-to-use, highly durable—yet still economical—soil moisture sensor. In fact, we’re so confident about the long life of our TEROS sensor line, we’ve increased our standard warranty from one to three years.
Backed by over 20 years of soil moisture research, the TEROS 11 combines METER’s trademark 70 MHz circuitry with an extremely ruggedized epoxy fill and securely attached, sharpened stainless steel needles that easily slip into the soil and are resistant to salts, so you can worry less about sensor deterioration. Very low power consumption and a high resolution provide increased precision over a longer period of time.
The TEROS 11 delivers the best volume of influence to sensor size on the market so you’re less susceptible to soil variability errors. We’ve optimised the circuitry in this 9.4-cm sensor to deliver an incredible one-litre volume of influence (versus the 200 mL typical for most sensors). Most soil sensors that measure this much volume are 20 cm or longer, causing installation headaches. Not only that, you can cut your installation time in half or more when you install with the new Borehole Installation tool. The tool mistake-proofs installation, eliminating common errors that cause uncertainty in the data—like air gaps, or preferential flow.
The TEROS 11 uses a completely new calibration procedure that maximises accuracy and minimises sensor-to-sensor variability while keeping the cost reasonable. So you can be confident that every sensor you install is going to read exactly like the next one. Unlike other sensors on the market which spec an unverifiable ±1.0% VWC accuracy, the TEROS 11 was rigorously tested by our soil physicists across a challenging range of soil types and EC levels so you can be confident in the accuracy of your data.
Plus, TEROS sensor repeatability can be checked with an accuracy verification standard. No other soil moisture sensor has this ability. Just slide the verification clip onto a sensor and plug it into a logger. If it reads within the right range, your sensor is good to go.
Easy and reliable data collection is part of the TEROS experience. Combine the TEROS 11 with the new ZL6, where all data is connected and delivered in near-real time through the cloud. All you have to do is sit back and let the data flow.
The TEROS 11 is a long-life, accurate, easy-to-install sensor that combines METER’s legendary high-frequency capacitance technology with an ultra-rugged form and a new calibration procedure to deliver an unbeatable price-to-performance ratio. If you’re planning a long-term large sensor network and want long-lasting performance for less work and less of your research budget, then choose the TEROS 11.
|Volumetric water content (VWC)|
|Range:||Mineral soil calibration: 0.00–0.70 m3/m3
Soilless media calibration: 0.0–1.0 m3/m3 Apparent dielectric permittivity (εa): 1 (air) to 80 (water)
NOTE: The VWC range is dependent on the media the sensor is calibrated to. A custom calibration will accommodate the necessary ranges for most substrates.
|Accuracy:||Generic calibration: ±0.03 m3/m3 typical in mineral soils that have solution electrical conductivity <8 dS/m
Medium specific calibration: ±0.01–0.02 m3/m3 in any porous medium
Apparent dielectric permittivity (εa): 1–40 (soil range) , ±1 εa (unitless) 40–80, 15% of measurement
|Dielectric measurement frequency:||70 MHz|
|Temperature:||Range: −40 to 60°C
Accuracy: ±1°C from −40 to 0°C
±0.5°C from 0 to +60°C
NOTE: Temperature measurement, for applicable sensors, may not be accurate if sensor is not fully immersed in the medium of interest, due to longer equilibration time.
|Output||DDI serial or SDI-12 communication protocol|
|Dimensions||Length: 9.4 cm
Width: 2.4 cm
Height: 7.5 cm
|Probe length||5.5 cm (2.17 in)|
|Cable length||5 m (standard)
75 m (maximum custom cable length)
|Connector types:||3.5-mm stereo plug connector or stripped and tinned wires|
|ELECTRICAL AND TIMING CHARACTERISTICS|
|Supply voltage (VCC) to GND||Minimum: 4.0 VDC
Maximum: 15.0 VDC
|Digital input voltage (logic high):||Minimum: 2.8 V
Typical: 3.6 V
Maximum: 3.9 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
|Power line slew rate:||Minimum: 1.0 V/ms
|Current drain (during 25-ms measurement)||Minimum: 3.0 mA
Typical: 3.6 mA
Maximum: 16.0 mA
|Current drain (while asleep)||Minimum: NA
Typical: 0.03 mA
|Operating temperature range:||Minimum –40°C
NOTE: Sensors may be used at higher temperatures under certain conditions; contact Customer Support for assistance.
|Power up time (DDI serial):||Minimum: 80 ms
Maximum: 100 ms
|Power up time (SDI-12):||Minimum: NA
Typical: 245 ms
|Measurement duration:||Minimum: 25 ms
Maximum: 50 ms
|COMPLIANCE:||Manufactured under ISO 9001:2015
EM ISO/IEC 17050:2010 (CE Mark)
2014/30/EU and 2011/65/EU
EN61326-1:2013 and EN55022/CISPR 22