TCAV-L 平均热电偶


TCAV-L 通常在土壤通量平衡系统中用于测量6-8cm的顶部土壤的平均温度。四个平行热电偶使用同一根24-AWG线缆,两两一对,每对最远可间隔1m,每个热电偶可被埋在不同深度的土壤中。


  • 与土壤热通量板和土壤湿度传感器配合使用,计算全部的土壤热通量



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.


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


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


Product Compatible Note
21X (retired)
CR10 (retired)
CR10X (retired)
CR200X (retired)
CR206X (retired)
CR211X (retired)
CR216X (retired)
CR23X (retired)
CR500 (retired)
CR5000 (retired)
CR510 (retired)
CR6 The CR6 is compatible when used with the CDM-A108 or CDM-A116.
CR9000 (retired)

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




  1. Yes, as long as the TCAV-L is measured using a differential measurement instruction. Be sure to connect the shield wire to analog ground.

  2. The TCAV-L is constructed using a Type E thermocouple wire. The high-order NIST polynomials were fit over the temperature range of -270° to 1000°C. The temperature range of a TCAV-L on a data logger depends on the measurement range selected in the thermocouple measurement instruction. For example, using a CR3000 and the ±20 mV input range and a reference temperature at 20°C, the TCAV-L temperature range is -270° to 300°C. Refer to the measurement section in the appropriate data logger manual for a detailed discussion on thermocouple measurements.

  3. The TCAV-L measurement range, accuracy, and resolution are a function of the data logger used to measure the TCAV-L. Refer to the appropriate data logger manual measurement section for more information.

  4. The TCAV-L is a Type E thermocouple. Use a Type E (chromel –constantan) Thermocouple found in the Sensor | Temperature group.


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