FW3 Type E Fine-Wire Thermocouple
Research Grade
High accuracy for temperature-gradient and eddy-covariance applications
meteorología aplicaciones agua aplicaciones energía aplicaciones flujo gas y turbulencia aplicaciones infraestructuras aplicaciones suelo aplicaciones


The FW3 is a Type E thermocouple with a 0.003 in. diameter. It measures atmospheric temperature gradients or fluctuations with research-grade accuracy. The FW3 is compatible with most Campbell Scientific dataloggers, and it is often used in eddy-covariance systems.

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Ventajas y características

  • Respuesta en alta frecuencia adecuado para aplicaciones eddy-covariance
  • Diámetro extremadamente pequeño que virtualmente elimina la carga solar
  • Adecuado para medidas del gradiente de temperatura


Descripción detallada

The FW3's small mass eliminates the need for a solar radiation shield. It consists of a type E thermocouple with a connector. The connector attaches the thermocouple to a datalogger 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.


Type Chromel-Constantan
Typical Output 60 μV/°C
Precisión Refer to the Thermocouple Measurement section in the datalogger manual.
Diameter 0.0762 mm (0.003 in.)
Longitud 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.)
Peso 45 g (2 oz)


Nota: lo siguiente muestra información de compatibilidad notable. No es una lista de todos los productos compatibles.


Producto Compatible Nota
CR1000 (retired)
CR1000X The CR1000X is compatible when used with the CDM-A108 or CDM-A116.
CR200X (retired)
CR216X (retired)
CR5000 (retired)
CR6 The CR6 is compatible when used with the CDM-A108 or CDM-A116.


Producto Compatible Nota
21X (retired)
CR10 (retired)
CR10X (retired)
CR23X (retired)
CR500 (retired)
CR510 (retired)
CR9000 (retired)

Información de compatibilidad adicional

Datalogger Considerations

The thermocouple connects to the datalogger via the FWC cable. One differential analog input per sensor is required.

Compatible Contemporary Dataloggers

CR200(X) Series CR800/CR850 CR1000 CR3000 CR9000X CR6 Series

Compatible Retired Dataloggers

CR500 CR510 CR10 CR10X 21X CR23X CR9000 CR5000 CR7X

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 FW3 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.

Preguntas frecuentes

Número de FAQs relacionadas con FW3: 2

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

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