TCAV-L Thermoelement für durchschnittliche Bodentemperatur

Überblick

Der TCAV-L bestimmt die Durchschnittstemperatur der oberen 6-8 cm des Bodens für Energiebilanz- oder Bowen-Ratio-Systeme. Darin sind 4 Thermoelemente parallel geschaltet, zusammen in einem 24 AWG-Kabel. Jedes der Thermoelemente eines Paares kann in einer anderen Tiefe eingebracht werden. Die beiden Paare können eine Distanz von bis zu 1m voneinander haben.

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Funktionen und Vorteile

  • In Verbindung mit Wärmeflussplatten und Bodenfeuchtesensoren kann der Bodenwärmestrom berechnet werden

Bilder

Technische Beschreibung

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.

Spezifikationen

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

Kompatibel mit

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

Datenlogger

Product Compatible Note
CR1000
CR1000X
CR200X (retired)
CR216X (retired)
CR3000
CR5000 (retired)
CR6 The CR6 is compatible when used with the CDM-A108 or CDM-A116.
CR800
CR850
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

FAQs für

Number of FAQs related to TCAV-L: 4

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  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 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.

  3. 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.

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

Anwendungsbeispiele

Austin College Weather Station
The Austin College Weather Station (ACWX) is located on Austin College's Sneed Environmental Research Area,......lesen Sie mehr