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TEROS 32 Advanced Field Tensiometer

Updated:2023-02-22

Brand: METER
Model: TEROS 32
Description: The tensiometer is, indisputably, the most accurate way to directly measure water potential in the wet range. But measuring with a tensiometer is complicated. Most require sophisticated wiring and com
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TEROS 32 Advanced Field Tensiometer Description：

User's Manual

Now, sit back, and relax

TEROS 32 is a simple, plug-and-play soil tensiometer that combines METER’s legendary German precision engineering with the power of ZENTRA Cloud, giving you easier, faster, more accurate water potential data in near-real time. Just install it and plug it in. It’s that easy. With ZENTRA Cloud software, you can review data as it happens from the comfort of your office, ensuring every tensiometer is working as expected. No more worrying if your tensiometer has cavitated. Combine the TEROS 32 with the TEROS 12, and you’ll know the best time to go out and refill. Plus, you can use both sensors to generate in situ moisture release curves.

More robust, if that’s even possible

Twenty-five years of tensiometer experience and fanatical attention to detail have made METER tensiometers practically bulletproof, but the TEROS 32 tensiometer is more robust than ever before. Technological advancements have made it possible to incorporate a more ruggedized, highly precise pressure transducer, giving you higher data resolution in an almost unbreakable form, and making the TEROS 32 more affordable than its predecessors. Plus, the ceramic and shaft are engineered to be virtually indestructible when it comes to harsh weather (10-year warranty on the ceramic), which means the TEROS 32 is a tensiometer you can rely on year after year in every season.

Accuracy has never been this easy

At METER, we know tensiometers. We’ve sold over 20,000 across the span of a quarter century, so if you need a precise, easy-to-use, reliable field tensiometer with outstanding year-round performance, you can rely on the TEROS 32.

Spend more time on what matters

We think you should spend less time fussing with complex installations, and more time on your research. That’s why unlike most tensiometers, the TEROS 32 field tensiometer is now plug and play. Just insert the stereo plug into the ZL6 data logger, and start seeing numbers. The TEROS 32 connects to the ZENTRA Cloud system, where all data are connected and delivered through the cloud. Pull up your data instantly wherever you are, and you’ll know exactly when it’s time to refill, before trekking out to the field.

Faster field visits

To save you even more time and effort, we’ve outfitted the TEROS 32 with an external refilling tube. No more pulling the tensiometer out of the ground. When it’s time to refill, the TEROS 32 can be filled externally without ever having to remove it, saving you hours of tedious maintenance. 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. Plus, it measures both positive and negative pore pressure.

Feature ：

Ultra-reliable outdoor precision tensiometer

Direct measurement with no need for calibration

Measures both positive and negative pore pressure

Plug and play with ZL6 data logger. Also compatible with third-party loggers

See/share data in near-real time with ZENTRA Cloud

10-year warranty on the high-quality ceramic

More affordable than its predecessors

Integrated temperature sensor

UV-resistant, durable shaft material

Seals and screw connectors are watertight according to IP 68

Extremely robust construction

Year-round operation when installed deeper than 30 cm

Can be refilled or emptied without removing from the soil

TEROS 32 Advanced Field Tensiometer Specification：

Measurement Specifications	Water Potential	Range: –85 to +50 kPa
		Resolution: 0.0012 kPa
		Accuracy: ±0.15 kPa
	Temperature	Range: –30 to +60 °C
		Resolution: ±0.01 °C
		Accuracy: ±0.1 °C between –20 and +40 °C (±1 °C outside of this range)
Communication Specifications	Output	DDI serial and SDI-12 communications protocol • 3- or 4-wire cable version • RS-485 4-wire cable version
	Output	Modbus RTU and tensioLINK serial communications protocol • 3- or 4-wire cable version • RS-485 4-wire cable version
	Data Logger Compatibility	METER ZL6 and EM60 data loggers or any data acquisition system capable of 4.0- to 28.0-VDC power and serial interface with SDI-12 and/or RS-485 interface, Modbus RTU, or tensioLINK.
Physical Specifications	Dimensions	Diameter: 2.5 cm (0.98 in)
	Dimensions	Length: 40.0 cm (15.75 in) 80.0 cm (31.50 in) 0.0 cm (47.24 in)
	Materials	Ceramic:Al²O³, bubble point 1,500 kPa
		Shaft: PMMA
		Corpus: POM GF
		Refilling Tubes: Stainless steel
	Installation Angle	10° to 80° from horizontal (downward) –10° to –80° from horizontal (upward)
	Operating Temperature	Minimum: –30 °C (0 °C for water-filled tensiometer) Typical: NA Maximum: 50 °C
	Cable Length	5 m (standard) 75 m (maximum custom cable length)
	Cable Diameter	Stereo Plug 4.2 ±0.2 mm (0.16 ±0.01 in) with minimum jacket of 0.8 mm (0.031 in) M12 Plug 5.5 ±0.2 mm (0.22 ±0.01 in) with minimum jacket of 1.0 mm (0.039 in)
	Connector Size	3.50 mm (diameter) 14.4 mm (diameter M12)
	Connector Types	Stereo plug connector or stripped and tinned wires 4-pin M12 connector or stripped and tinned wires
	Conductor Gauge	Stereo Plug 22-AWG / 24-AWG ground wire M12 Plug 22-AWG
Electrical and Timing Characteristics	Supply Voltage (Power to Ground)	Minimum: 4.0 V Typical: 12.0 V Maximum: 28.0 V
	Digital Input Voltage (Logic High)	Minimum: 1.6 V Typical: 3.3 V Maximum: 5.0 V
	Digital Input Voltage (Logic Low)	Minimum: -0.3 V Typical: 0.0 V Maximum: 0.9 V
	Digital Output Voltage (Logic High)	Minimum: NA Typical: 4.0 V Maximum: NA
	Power Line Slew Rate	Minimum: 1.0 V/ms Typical: NA Maximum: NA
	Current Drain (During Measurement)	Minimum: 18.0 mA Typical: 25.0 mA Maximum: 30.0 mA
	Current Drain (While Asleep)	Minimum: 0.03 mA Typical: 0.05 mA Maximum: 0.9 mA
	Power Up Time (DDI Serial)	Minimum: 125 ms Typical: 130 ms Maximum: 150 ms
	Power Up Time (SDI-12)	Minimum: 125 ms Typical: 160 ms Maximum: 175 ms
	Measurement Duration	Minimum: 60 ms Typical: 65 ms Maximum: 70 ms
Other	BARO Module	When using the METER tensiometers TEROS 31 and TEROS 32 in combination with a non-METER data logger, a highly accurate barometric compensation is needed to get the most precise soil water potential measurement. The BARO Module can be used as a stand-alone sensor for measuring atmospheric pressure at a measuring site. It is also available with different connectors, so the BARO Module can be connected directly in between a tensiometer and a data logger. The BARO Module can also act as a digital/analog converter to connect a tensiometer with serial output to a data logger with analog input channels. The logger obtains a barometric compensated analog matric potential signal. The BARO Module can be used for varied logger communications: SDI-12, Modbus, tensioLINK, analog voltage signal.
Other	Compliance	EM ISO/IEC 17050:2010 (CE Mark) 2014/30/EU and 2011/65/EU EN61326-1:2013 and EN55022/CISPR22