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New full immersion probes from Fluke perform in extreme environments

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The Hart Scientific Division of Fluke Australia has introduced new full immersion platinum resistance thermometer (PRT) probes designed to perform in extreme environments. The Hart Scientific 5606 and 5607 full immersion PRT probes are designed to perform in “full immersion” applications where both the transition junction and the lead wires must withstand temperatures covering the entire operating range of the probe.

Applications of the full immersion thermometer probes include:

  • Calibration
  • Validation of sensors used in laboratory or bio freezers
  • Walk-in refrigerators
  • Autoclaves
  • Ovens
  • Stability test chambers
  • Furnaces
  • Incubators
Features of the full immersion thermometer probes include the following:
  • The Hart Scientific 5606 thermometer probes have a temperature range of -200 °C to 160 °C, while the 5607 has a range of 0 °C to 450 °C
  • The 5606 is only two inches (50 mm) in length with a sheath diameter of 1/8 inch (3.1 mm)
  • The lead wires of the 5606 temperature probes are made of single-conductor enameled copper wire, which prevents moisture from wicking to the sensing element as it would if a more common, stranded lead wire were used
  • The diameter of the lead wire is no greater than 0.2 mm, making it easy to run lead wires through a freezer door to a readout or transmitter with effectively zero energy loss
  • The lead wire of the 5607 is shielded with braided stainless steel and connected to the transition junction with a strain relief spring
Since they can be fully immersed over their entire temperature range, users of the full immersion thermometer probes need not worry about calculating minimum immersion depth and can immerse the entire probe, transition junction and lead wires in either non-corrosive liquids or dry mediums.  The 5606 full immersion thermometer probes have been proven in common heat transfer fluids such as silicone oil, mineral oil, ethanol, and even liquid nitrogen with no degradation of the transition junction seal or lead wire insulation.

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