FW05 Type E Fine-Wire Thermocouple
Research Grade
High accuracy for eddy-covariance applications
weather applications water applications energy applications gas flux and turbulence applications infrastructure applications soil applications

Overview

The FW05 is a Type E thermocouple with a 0.0005 in. diameter. It measures atmospheric temperature gradients or fluctuations with research-grade accuracy. The FW05 is compatible with most Campbell Scientific data loggers, and it is often used in eddy-covariance systems.

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Benefits and Features

  • High frequency response suitable for eddy-covariance applications
  • Extremely small diameter virtually eliminates solar loading
  • Well-suited for measuring atmospheric temperature flux

The FW/ENC Carrying Case is required to ship our FW05 thermocouples. It holds up to four thermocouples.

Images

FW05 fine-wire thermocouple
FW05 fine-wire thermocouple
FW05 fine-wire thermocouple
FW05 attached to an IRGASON
Exploded view of FW05 attachment to an IRGASON
FW05 attached to a CSAT3B
Exploded view of FW05 attachment to a CSAT3B

Detailed Description

The FW05 has the smallest diameter of our fine wire thermocouples. Because of this, it experiences the least amount of solar loading, but is also the most fragile. The thermocouple's small mass eliminates the need for a solar radiation shield.

The FW05 consists of a type E thermocouple with a connector. The connector attaches the thermocouple to a data logger via the FWC-L cable.

Type E thermocouples 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.
Diameter 0.0127 mm (0.0005 in.)
Length 36.8 cm (14.5 in.)
Plug Dimensions 1.8 x 3.3 x 1.0 cm (0.7 x 1.3 x 0.4 in.)
Weight 45 g (2 oz)

Compatibility

Note: The following shows notable compatibility information. It is not a comprehensive list of all compatible or incompatible products.

Data Loggers

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

Additional Compatibility Information

Data Logger Considerations

The thermocouple connects to the data logger via the FWC cable. One differential analog input per sensor 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

Carrying Case

The FW/ENC Carrying Case is required to ship our FW05 thermocouples. It holds up to four thermocouples. Thermocouples returned to Campbell Scientific for repair without this case will be shipped to the customer in a new case and the account charged accordingly.

Frequently Asked Questions

Number of FAQs related to FW05: 6

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  1. Is it possible to measure the absolute temperature with an accuracy of 0.01°C using the FW05? Or do the thermocouple output error and the thermocouple voltage error inhibit such accuracies?

    Measuring the thermocouple with an accuracy of 0.01°C is difficult, if not impossible, because of polynomial errors, voltage errors, and potential temperature gradients across the data logger terminal strips.

  2. To measure sensible heat flux using the eddy-covariance technique, which fine-wire thermocouple should be used?

    The FW05.

  3. Is there a module to read a group of fine-wire thermocouples?

    Most Campbell Scientific data loggers can measure a thermocouple without any external signal conditioning. Therefore, a dedicated module is not required.

  4. Can Campbell Scientific fine-wire thermocouples measure the temperature of a 50 µm by 50 µm flat surface?

    No. The fine-wire thermocouples were designed to measure ambient air temperature.

  5. What is the frequency response of the FW05 thermocouple?

    The FW05 has a frequency response that is adequate for the eddy-covariance flux application.

  6. How is sensible heat flux measured using a CSAT3/3A/3H and an FW05?

    Sensible heat flux is defined as the covariance of vertical wind and temperature fluctuations, measured with fast-response sensors. For more information, refer to a micrometeorology textbook.

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