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METER Legacy Field Water Potential Sensors

METER Legacy Field Water Potential Sensors

T8 TENSIOMETER

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    T8 tensiometer soil moisture sensor or soil sensor
    T8 tensiometer for measuring soil water potential
  • Description

    To refill, or not to refill?  That is the question.

    The truth about tensiometers is that they’re hard to integrate into complex sensor networks, and they can be damaged or destroyed by bad weather. Plus, they need to be refilled, which means constantly pulling the tensiometer out of the soil to check the water level. Tensiometers simply haven’t been a practical part of a modern sensor network. Until now.

    Tensiometers–simplified

    With the T8 Tensiometer, our goal was to design an instrument that was easy to use, reliable, and practically bulletproof when it comes to harsh weather.  Not only that, an external refilling tube and plug and play capability make this the first tensiometer that works well in a large sensor network.

    Master of the quick change–even under pressure

    The highly-responsive T8 reacts much faster to changing soil conditions because of its small water volume, enabling you to measure even the most minute changes in water potential—something lower-quality tensiometers cannot do. It measures matric potential in the wet range, where most water movement occurs, enabling you to predict whether water will move and where it will go. In addition, the T8 still functions under positive pressure, meaning when the ground becomes saturated, it measures how high the water level is above saturation, important for understanding slope stability.

    A refill gauge that’s always on the level

    We’ve outfitted the T8 with an external refilling tube. No more pulling the tensiometer out of the ground. When it’s time to refill, the T8 can be filled externally without ever having to remove it, saving you an incredible amount of time and hassle. Not only that, a water level indicator lets you know when it’s time to refill, so you never have to guess if your water potential data are valid.

    Never leaves you in the cold

    Engineered specifically for long-term, year-round use, the T8 is extremely robust, frost-proof, and reliable. It offers an integrated temperature sensor, as well as lightning protection. Thanks to its solid construction and impact-resistant plastic, the T8 Tensiometer is unaffected by tough, year-round use in the field.

    It’s as easy as plug and play

    To save you even more time, the T8 is incredibly easy to install. Not only is it plug and play with METER data loggers, but its digital sensor interfaces with SDI-12 and RS485 and is easily integrated into large sensor networks, even those operated by a single data logger.

    Uncompromising, peerless design for long-term measurement

    Reliability. Versatility. Ease-of-use. Precision. Over 25 years of German engineering has made the T8 Tensiometer into one of the most accurate, robust tensiometers in its class, saving you time and hassle and making your life much easier.

    FEATURES

    • Reliable outdoor tensiometer
    • Water level indicator
    • Integrated external refilling
    • Integrated temperature sensor
    • UV-resistant, durable shaft material
    • Seals and screw connectors are watertight according to IP 68
    • Solid construction
    • Year-round operation when installed deeper than 30 cm
    • Shaft and cable lengths free configurable
    • Plug and play with METER data loggers
    • SDI-12 compatible
  • Specifications

    SPECIFICATIONS

    Ceramic cupHigh-strength special ceramic with homogeneous porosity
    Length: 60 mm
    Diameter: 24 mm
    Tensiometer shaftVarious lengths available (standard 200 mm)
    Diameter: 25 mm
    Material: acrylglass 19/25 mm
    **Please indicate shaft length on your order**
    AccuracySoil water tension: ± 0.5 kPa
    Temperature: ± 0.2 °C (-10 to 10 °C), ± 0.5 °C (-30 to 70 °C)
    Resolution0.1 kPa
    Output signal analogSelectable ranges: 2 x 0 … 1 V / 2 V / 5 V
    Output signal digitalRS485 tensioLINK, SDI-12
    Current consumption7 mA
    Measuring range soil water tension+100 to -85 kPa
    Delivery contentsShaft water protection cover, calibration certificate, refilling syringe, user manual
    Measuring range temperature-30 to 70 °C
    Power supply6 to 20 VDC
    Data logger compatibilityMETER ZL6, EM50/60 series, Campbell Scientific, Infield 7
    Cable1.5 m; 8-pin plug M12; pigtail adapter available for connection with CSI dataloggers
    3.5m; M12 stereo plug for METER data loggers
    NoteMETER uses UV-resistant, durable materials for long-term field studies. Seals and screw connectors are watertight according to IP 68
  • Manuals and software

T4 TENSIOMETER

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    T4 | Robust Field Tensiometer | METER

  • Description

    The cause of tension in tensiometers

    The problem with most tensiometers is that they don’t stand up to year after year of harsh weather conditions like frost. Plus, you’re constantly pulling the tensiometer up to check the water level, which can be especially frustrating during long-term studies.

    The search is over

    Introducing the T4 Tensiometer. The T4 is one of our bestselling tensiometers because it’s robust, precise, and easy to use, all at the same time. More usable than other tensiometers, it provides superior quality water potential data and remains one of the most reliable instruments in the world for year-round outdoor monitoring. Plus, the T4’s external refilling tube and simple installation save you an incredible amount of time and effort. On top of all that, the tensiometer is highly responsive.  It reacts much faster to changing soil conditions than lower-quality tensiometers, enabling you to measure even the most minute changes in soil water potential.

    It’s not immortal, but almost

    Specifically designed for field use, the T4 ceramic and shaft are engineered to be virtually indestructible when it comes to harsh weather. The combination of this unbreakable and frost-resistant special ceramic and the new, impact-resistant shaft make the T4 a tensiometer you can rely on year after year in every season. And the T4 Tensiometer has a high accuracy of ±0.5 kPa, giving you peace of mind.

    No removal? No problem.

    We’ve outfitted the T4 with an external refilling tube. No more pulling the tensiometer out of the ground. When it’s time to refill, the T4 can be filled externally without ever having to remove it, saving you considerable time and hassle.

    Pain-free installation

    To save you even more time and effort, the T4 comes with a perfectly-sized auger to ensure as little soil disturbance as possible.  For spot measurements in the field, just auger a hole and insert the tensiometer.  It’s that easy.  For long-term measurement, the T4 connects to the Infield 7 or any Campbell Scientific data logger.

    A tensiometer for all seasons

    At METER, we know soil tensiometers. We’ve sold over 10,000 across the span of a quarter century, so we’re confident that if you need a precise, easy, and reliable field tensiometer with outstanding year-round performance, you can rely on the T4.  Its robust, frost-resistant design will never leave you in the cold.

    FEATURES

    • Reliable outdoor tensiometer
    • UV-resistant, durable shaft material
    • Seals and screw connectors are watertight according to IP 68
    • Solid construction
    • Year-round operation when installed deeper than 30 cm
    • T4e can be refilled or emptied without removing it from the soil
  • Specifications

    SPECIFICATIONS

    Ceramic cupHigh-strength special ceramic with homogeneous porosity
    Length: 60 mm
    Diameter: 24 mm
    Temperature shiftTemperature-compensated, typical shift 0.5% FS over 20K
    Stability typical shift < 0.5% p.a.
    Shaft optionsVarious lengths available (standard 300 mm)
    Diameter: 25 mm
    Material: acrylglass 19/25 mm
    **Please indicate shaft length on your order**
    SensorPiezoresistive pressure-transducer
    Max. overpressure: ± 300 kPa
    Output signal100 kPa = -100 ± 3 mV
    -85 kPa = 85 ± 3 mV
    at 10.6V excitation

    Galvanic sensor insulated from soil water, signals analog and continuous
    Accurate values according to the calibration certificate
    Impedance: ~.5 kOhm

    Measuring pincipleSoil water tension, transmitted via ceramic cup into the tensiometer, onto the water and pressure transducer, giving a continuous analog signal
    Electronic principleAsymm. Wheatstone full bridge
    Power supply10.6 VDC (5 – 15 VDC), stabilized
    Range+100 to -85 kPa
    Resolution0.1 kPa
    Accuracy± 0.5 kPa
    Current consumption~1.3 mA (at 10.6 V)
    Data logger compatibilityCampbell Scientific, Infield 7
    Cable1.5 m: 4-pin plug M12
    **Please indicate cable length on your order!**
    NoteMETER uses UV-resistant, durable materials for long-term field studies. Seals and screw connectors are watertight according to IP68.
  • Manuals and software

MPS-6 (now called TEROS 21) WATER POTENTIAL SENSOR

Find product information and support materials here.

TS1 TENSIOMETER (discontinued)

See new tensiometers

It’s not immortal, but almost

Designed for field-use, the TEROS 32 tensiometer ceramic and shaft are engineered to be virtually indestructible when it comes to harsh weather.

Simply accurate. Simply fast. Simple to use.

With the WP4C, soil moisture release curves in the dry range have never been easier.