Tech Specs

TEROS 32 Tech Specs


Measurement Specifications
Water Potential
Range: –85 to +50 kPa
Resolution: 0.0012 kPa
Accuracy: ±0.15 kPa
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
DDI serial and SDI-12 communications protocol
• 3- or 4-wire cable version (Figure 3 in Integrator Guide).
• RS-485 4-wire cable version (Figure 5 in Integrator Guide).
Modbus RTU and tensioLINK serial communications protocol
• 3- or 4-wire cable version (Figure 4 in Integrator Guide).
• RS-485 4-wire cable version (Figure 6 in Integrator Guide).
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
Diameter: 2.5 cm (0.98 in)
Length: 40.0 cm (15.75 in)
80.0 cm (31.50 in)
120.0 cm (47.24 in)
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 Range
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)
NOTE: Contact Customer Support if a nonstandard cable length is needed.
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: .03 mA
Typical: .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
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.
EM ISO/IEC 17050:2010 (CE Mark)
2014/30/EU and 2011/65/EU
EN61326-1:2013 and EN55022/CISPR22

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