TEROS 22 Soil Water Potential Temperature Sensor

TEROS 22 Soil Water Potential Temperature Sensor

TEROS 22 is a full range soil water potential sensor developed by METER based on 40 years of experience in water potential sensor production. On the basis of inheriting the characteristics of TEROS 21 sensor, it has achieved a more exquisite appearance and easier installation. Simply drill a 1.6 cm hole with an electric drill to install TEROS 22.

working principle

The TEROS 22 sensor consists of a humidity sensor and a porous material with a known moisture characteristic curve. When the porous material reaches moisture equilibrium with the surrounding soil, the humidity sensor measures the moisture content of the porous material and converts it into water potential based on the moisture characteristic curve.

Main Features

· Installation and removal are both very convenient, just drill a hole with a diameter of 1.6 cm to install.

· Wide measurement range of 0-100000 kPa, achieving full range soil water potential monitoring.

· Easy maintenance, no need for water injection, and will not be damaged in low-temperature freezing environments.

· No need for further calibration: There is no drift caused by degradation in ceramic materials with silica matrix.

· Salt insensitivity: Even in high salt environments and soils with varying salt content, the sensor remains accurate.

· Additional temperature measurement: At the same time, it can obtain another important indicator of plant growth.

· Durable and sturdy: The epoxy resin overlay injection molding process ensures its suitability for long-term field monitoring and research.

· Plug and play: As long as the sensor is set up, the data acquisition is connected, the clock and measurement interval are set, and data collection can begin. No programming required.

· Remote data acquisition: When TEROS 22 connects to ZL6 data acquisition, select ZENTRA Cloud service to acquire data through the Internet.

· Compatible with SDI-12: TEROS 21 is almost compatible with all mainstream data acquisition systems that support SDI-12, using a universal communication protocol.

technical indicators

Measurement frequency:70 MHz

output:DDI serial port or SDI-12 communication protocol

Support data collection (purchased separately):METER ZL6, EM60 series data acquisition, or 4.0~15 VDC power supply, supports serial port or SDI-12 communication data acquisition.

Size:Diameter 1.7 cm, length 17 cm, optional extension rod length 40,80120 cm for connection

Work environment:-40 ~ 60 ℃

Cable length:5 m， Other lengths can be customized, up to a maximum of 75 meters

Cable diameter:4.20 mm

Interface type:3.5mm headphone jack or tin plated bare wire jack

Wire specifications:22 AWG/24 AWG drain wire

Supply voltage (VCC to GND):4.0~15.0 VDC

Digital input voltage (logic high):2.8~5.0 V， Typical 3.6 V

Digital input voltage (logic low):-0.3~0.8 V， Typical 0.0 V

Digital output voltage (logic high):典型3.6 V

Power supply current:Minimum 15 mA

Power line conversion rate:Minimum 1.0 V/ms

electric current:

During the measurement period:3.0~16.0 mA; typical 5.0 mA;

During the static waiting period:典型0.03 mA

Start time:

DDI serial port:Typical 100 ms,<350 ms;

SDI-12 (DDI enabled):Typical 260 ms,<500 ms;

SDI-12 (DDI disabled):Typical 170 ms

Measuring time:Typical 50ms

Following standards:EM ISO/IEC 17050:2010 (CE marking); EN 55011:2016/A1:2017 (RCM Mark)

TEROS 22 Soil Water Potential Temperature Sensor