New full immersion probes are designed to perform in extreme environments


EVERETT, Wash. – The Hart Scientific Division of Fluke Corporation has introduced new full immersion platinum resistance thermometer (PRT) probes designed to perform in extreme environments.

The Hart Scientific 5606 and 5607 Full Immersion PRTs 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. Such applications can include calibration or validation of sensors used in laboratory or bio freezers, walk-in refrigerators, autoclaves, ovens, stability test chambers, furnaces or incubators.

The Hart Scientific 5606 has 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 2 inches (50 mm) in length with a sheath diameter of 1/8 inch (3.1 mm). Since it can be fully immersed over its entire temperature range, users 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 lead wires of the 5606 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 5606 has 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.

The 5607 has been designed specifically for performing calibrations or verifying the accuracy of sensors used in ovens or furnaces. Intended to be used in dry mediums only, the 5607 can be fully immersed in dry mediums over a temperature range of 0 °C to 450 °C. There isn’t another PRT on the market that can be fully immersed over this range and remain as stable and accurate (± 0.05 °C). The lead wire of the 5607 is shielded with braided stainless steel and connected to the transition junction with a strain relief spring.

The Hart Scientific 5606 Full Immersion PRT has a U.S. list price of $385; the 5607 Full Immersion PRT has a U.S. list price of $465. For more information and full specifications on the Hart Scientific 5606 and 5607 Full Immersion PRTs, call toll free 1-800-GET-HART (1-800-438-4278) or 801-763-1600 or email

About Fluke
Fluke Corporation is the leader in precision calibration instrumentation and software for electrical, temperature, pressure, flow, and RF measurements. Calibration products from Fluke and its Hart Scientific and DH Instruments Divisions are found in calibration facilities around the world, including National Metrology Institutes, that demand the highest levels of performance and reliability, backed by state of the art metrology and uncompromising support. They are relied on by quality engineers, calibration technicians, and metrologists to instill confidence in the measurements that are critical to their organizations for quality, safety, reliability, and cost. Fluke and DHI are either registered trademarks or trademarks of Fluke Corporation in the United States and/or other countries. The names of actual companies and products mentioned herein may be the trademarks of their respective owners.


• Temperature range - 0 °C to 450 °C • Sensor length - 30 mm ± 3mm (1.2 in ±0.1 in)
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