TCAV Averaging Soil Thermocouple Probe
The Campbell Scientific TCAV Averaging Soil Thermocouple probe measures soil temperatures at four separate depths (0.5 cm, 5.5 cm, 10 cm, and 15.5 cm) to estimate the average temperature in the upper 16 cm of soil.
- Sensor: Type-E Thermocouple (Chromel-Constantan)
- Accuracy: ±1.7 deg C
- Depth: 0.5 cm, 5.5 cm, 10 cm, and 15.5 cm
- Primary Use: Calculation of heat storage in top 16 cm of soil for energy balance studies
CS655 Water Content Reflectometer
The Campbell Scientific CS655 Water Content Reflectometer measures volumetric soil moisture, the ratio of water volume to total volume of soil and water. Additional measurements of this sensor include dielectric permittivity, bulk electrical conductivity, and soil temperature.
- Sensor Type: Time domain reflectometer (TDR)
- Accuracy: 3%
- Depth: 8 cm
- Primary Use: Measurement of volumetric water content. The maximum value for clay soils at the Sneed Environmental Research Area is 0.50.
- Secondary Use: Calculation of heat capacity of soil/water for heat storage calculation
HFP01SC Heat Flux Plate
The total ground heat flux is calculated from two components, a storage of energy in the upper 16 cm of soil and the flux of heat into the soil at 16 cm depth. The storage term is calculated from soil temperature and soil moisture measurements. The heat flux term is measured by a HFP01SC Heat Flux Plate manufactured by Hukseflux.
- Sensor: Thermopile and film heater
- Accuracy: 3%
- Depth: 16 cm
- Self-calibration: 3 minutes every 6 hours using a fixed amount of heat
- Primary Use: Calculation of soil heat flux at 16-cm depth