What to do if the METER TEROS 21 data logger is not receiving readings from the sensor?
First, check that the connections to the data logger are correct and secure. Next, ensure that the data logger batteries are not dead or weakened. Also, check the configuration of the data logger through software to ensure TEROS 21 is selected and that the software and firmware are up to date.
What to do if METER Accessories sensor does not appear to be responding to changes in soil water potential?
Ensure that the sensors are installed correctly. Check the sensor cables for any damage that could be causing a malfunction, and inspect the ceramic disc for damage or contamination.
General| Measurement Range (Volumetric Water Content) | 0 to 100% |
|---|---|
| Operating Temperature | -40 to 60 °C |
| Resolution | 0.1 kPa |
| Output | SDI-12 |
| Length | 85 mm |
| Width | 22 mm |
| Weight | 150 g |
| Material | Epoxy, stainless steel |
| Cable Length | 5 m |
| Accuracy (Volumetric Water Content) | ±3% |
| Accuracy (Soil Water Potential) | ±10% |
METER sensors are built to the highest standards, but misuse, improper protection, or improper installation may damage the sensor.
Follow the steps listed in Table 1 to set up the sensor. It is critical that the sensor has good hydraulic contact.
The TEROS 21 sensors work best with METER data loggers or ProCheck handheld readers.
The SDI-12 protocol requires unique sensor addresses. TEROS 21 sensors factory default to an SDI-12 address of 0.
Measurement and physical specifications for the TEROS 21 sensor, including range, resolution, and accuracy.
The TEROS 21 sensor measures the water potential and temperature of soil with porous ceramic discs.
TEROS 21 sensors measure water potential using a solid matrix equilibration technique.
TEROS 21 measures water content and converts it to water potential using the moisture characteristic curve.
Covers dry-end and wet-end limitations affecting sensor performance at extreme water potentials.
TEROS 21 is calibrated at saturated and air-dry states, providing accuracy of ±(10% of reading + 2 kPa).
TEROS 21 uses a surface-mounted thermistor to take temperature readings in degrees Celsius.
Factors affecting sensor performance in frozen soils, high salinity, and temperature variations.
TEROS 21 calibration is not affected by soil type if installed with adequate hydraulic contact.
TEROS 21 may be returned to METER for maintenance: system inspection, parts replacement, and instrument cleaning.
Lists common problems and solutions for the TEROS 21 sensor, such as logger recognition and readings.
Customer service representatives are available for questions, problems, or feedback Monday through Friday.
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