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 dataloggers, and it is often used in eddy-covariance systems.Read More
The FW/ENC Carrying Case is required to ship our FW05 thermocouples. It holds up to four thermocouples.
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 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.
A reference temperature measurement is required for thermocouple measurements. The temperature sensor built into many of our dataloggers' wiring panel typically provides this measurement.
|Typical Output||60 μV/°C|
|Accuracy||Refer to the Thermocouple Measurement section in the datalogger 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)|
The thermocouple connects to the datalogger via the FWC cable. One differential analog input per sensor is required.
|CR200(X) Series||CR800/CR850||CR1000||CR3000||CR9000X||CR6 Series|
A reference temperature measurement is required. Options for measuring the reference temperature include:
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.
Number of FAQs related to FW05: 6
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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 datalogger terminal strips.
Most Campbell Scientific dataloggers can measure a thermocouple without any external signal conditioning. Therefore, a dedicated module is not required.
No. The fine-wire thermocouples were designed to measure ambient air temperature.
The FW05 has a frequency response that is adequate for the eddy-covariance flux application.
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.