TCAV-L Averaging Soil Thermocouple Probe

Overview

The TCAV-L typically provides the average temperature of the top 6 to 8 cm of soil for energy-balance in flux systems. It parallels four thermocouples together into one 24 AWG wire. Each member of a thermocouple pair can then be buried at a different depth. The two pairs are separated at a distance of up to 1 m.

Read More

Benefits and Features

  • Used in conjunction with soil heat-flux plates and soil-moisture probes to compute total soil heat flux

Images

Technical Description

The TCAV uses type E thermocouples, which are comprised of a chromel wire and a constantan wire joined at a measurement junction. A voltage potential is generated when the measurement end of the thermocouple is at a different temperature than the reference end of the thermocouple. The magnitude of the voltage potential is related to the temperature difference. Therefore, temperature can be determined by measuring the differences in potential created at the junction of the two wires.

A reference temperature measurement is required for thermocouple measurements. The temperature sensor built into many of our data loggers' wiring panel typically provides this measurement.

Specifications

Type Chromel-Constantan
Typical Output 60 μV/°C
Accuracy Refer to the Thermocouple Measurement section in the data logger manual.
Weight 0.45 kg (1 lb) with 15.24-m (50-ft) cable

Compatibility

Please note: The following shows notable compatibility information. It is not a comprehensive list of all compatible products.

Dataloggers

Product Compatible Note
21X (retired)
CR10 (retired)
CR1000
CR1000X
CR10X (retired)
CR200X (retired)
CR211X (retired)
CR216X (retired)
CR23X (retired)
CR3000
CR500 (retired)
CR5000 (retired)
CR510 (retired)
CR6 The CR6 is compatible when used with the CDM-A108 or CDM-A116.
CR800
CR850
CR9000 (retired)
CR9000X

Additional Compatibility Information

Data Logger Considerations

One differential analog input channel per probe is required.

Reference Temperature Measurement

A reference temperature measurement  is required. Options for measuring the reference temperature include:

  • Thermistor built into the CR800, CR850, CR1000, CR3000, or CR5000 wiring panel
  • PRT built into the wiring panel of the CR9050 or
  • CR9051E input module for the CR9000X Measurement and Control Datalogger
  • PRT built into the wiring panel of the CR723T input card for the CR7 Measurement and Control Datalogger
  • CR10XTCR thermistor that connects to the CR10X wiring panel

Case Studies

China: Flux Cooperation
This case study discusses the integration of CPEC310 and AP200 systems to explore the theories......read more
Alaska: Eddy Covariance
Scientists and land-use managers have long recognized the importance of forest lands for their role......read more
Austin College Weather Station
The Austin College Weather Station (ACWX) is located on Austin College's Sneed Environmental Research Area,......read more