MeterTeros11.h file

Classes

class MeterTeros11

The Sensor sub-class for the Meter Teros 11 sensor.

class MeterTeros11_Count

The Variable sub-class used for the raw calibrated VWC counts from a Meter Teros soil moisture/water content sensor.

class MeterTeros11_Temp

The Variable sub-class used for the temperature output output from a Teros soil moisture/water content sensor.

class MeterTeros11_Ea

The Variable sub-class used for the apparent dielectric permittivity (εa, matric potential) from a Meter Teros soil moisture/water content sensor.

class MeterTeros11_VWC

The Variable sub-class used for the volumetric water content output from a Teros soil moisture/water content sensor.

Defines

#define TEROS11_NUM_VARIABLES = 4

Sensor::_numReturnedValues; the Teros 11 can report 2 raw values - counts and temperature.

#define TEROS11_INC_CALC_VARIABLES = 2

Sensor::_incCalcValues; We calculate permittivity and water content from the raw counts and temperature reported by the Teros 11.

Sensor Timing

The sensor timing for a Meter Teros 11

#define TEROS11_WARM_UP_TIME_MS = 250

Sensor::_warmUpTime_ms; the Teros 11 warm-up time in SDI-12 mode: 245ms typical.

#define TEROS11_STABILIZATION_TIME_MS = 50

Sensor::_stabilizationTime_ms; the Teros 11 is stable after 50ms.

#define TEROS11_MEASUREMENT_TIME_MS = 50

Sensor::_measurementTime_ms; the Teros 11 takes25 ms to 50 ms to complete a measurement.

#define TEROS11_EXTRA_WAKE_TIME_MS = 0

Extra wake time required for an SDI-12 sensor between the "break" and the time the command is sent. The Terros-11 requires no extra time.

Raw Counts

The raw VWC counts variable from a Meter Teros 11

• Range and accuracy of the raw count values are not specified

#define TEROS11_COUNT_RESOLUTION = 1

Decimals places in string representation; EA should have 1.

#define TEROS11_COUNT_VAR_NUM = 0

Sensor variable number; EA is stored in sensorValues[0].

#define TEROS11_COUNT_VAR_NAME = "counter"

Variable name in ODM2 controlled vocabulary; "counter".

#define TEROS11_COUNT_UNIT_NAME = "count"

Variable unit name in ODM2 controlled vocabulary; "count".

#define TEROS11_COUNT_DEFAULT_CODE = "RawVWCCounts"

Default variable short code; "RawVWCCounts".

Temperature

The temperature variable from a Meter Teros 11

• Range is -40°C to 60°C
• Accuracy is:
  • ± 1°C, from -40°C to 0°C
  • ± 0.5°C, from 0°C to + 60°C

#define TEROS11_TEMP_RESOLUTION = 2

Decimals places in string representation; temperature should have 2.

#define TEROS11_TEMP_VAR_NUM = 1

Sensor variable number; temperature is stored in sensorValues[1].

#define TEROS11_TEMP_VAR_NAME = "temperature"

Variable name in ODM2 controlled vocabulary; "temperature".

#define TEROS11_TEMP_UNIT_NAME = "degreeCelsius"

Variable unit name in ODM2 controlled vocabulary; "degreeCelsius" (°C)

#define TEROS11_TEMP_DEFAULT_CODE = "SoilTemp"

Default variable short code; "SoilTemp".

EA

The EA variable from a Meter Teros 11

• Range is 1 (air) to 80 (water)
• Accuracy is:
  • 1–40 (soil range), ±1 εa (unitless)
  • 40–80, 15% of measurement

#define TEROS11_EA_RESOLUTION = 5

Decimals places in string representation; EA should have 5.

#define TEROS11_EA_VAR_NUM = 2

Sensor variable number; EA is stored in sensorValues[0].

#define TEROS11_EA_VAR_NAME = "permittivity"

Variable name in ODM2 controlled vocabulary; "permittivity".

#define TEROS11_EA_UNIT_NAME = "faradPerMeter"

Variable unit name in ODM2 controlled vocabulary; "faradPerMeter" (F/m)

#define TEROS11_EA_DEFAULT_CODE = "SoilEa"

Default variable short code; "SoilEa".

Volumetric Water Content

The VWC variable from a Meter Teros 11

• Range is:
  • Mineral soil calibration: 0.00–0.70 m3/m3 (0 – 70% VWC)
  • Soilless media calibration: 0.0–1.0 m3/m3 (0 – 100% VWC)
• Accuracy is:
  • Generic calibration: ±0.03 m3/m3 (± 3% VWC) typical in mineral soils that have solution electrical conductivity <8 dS/m
  • Medium specific calibration: ±0.01–0.02 m3/m3 (± 1-2% VWC)in any porous medium

#define TEROS11_VWC_RESOLUTION = 3

Decimals places in string representation; VWC should have 3.

#define TEROS11_VWC_VAR_NUM = 3

Sensor variable number; VWC is stored in sensorValues[2].

#define TEROS11_VWC_VAR_NAME = "volumetricWaterContent"

Variable name in ODM2 controlled vocabulary; "volumetricWaterContent".

#define TEROS11_VWC_UNIT_NAME = "percent"

Variable unit name in ODM2 controlled vocabulary; "percent" - volumetric percent water content (%, m3/100m3)

#define TEROS11_VWC_DEFAULT_CODE = "SoilVWC"

Default variable short code; "SoilVWC".