AMETEK STC releases a new JOFRA temperature calibrator that is focused on calibrating the sanitary sensors

Denmark, Allerod – The sanitary sensors used in the food and pharmaceutical industries are some of the most difficult sensors to calibrate. To calibrate these sensors with precision technicians must place the sensing element within the uniform zone of the temperature calibrator. This is usually difficult because of the small dimensions and fragility of the sensor that is sanitary.

Image Credit to: Ametek STC

AMETEK STC has a solution. They have announced their JOFRA-168 Reference Temperature Calibrator. “We have years of experience producing the best temperature calibrators. This knowledge allowed us to design the new RTC-168. It incorporates an first-of-its-kind innovation and other performance improvements,” Haakon Harslund (Director of Engineering at AMETEK STC, Allerod Denmark) stated.

The RTC-168 has a new well design that allows the sanitary sensors that have large-flanged flanges to be closer to the temperature uniformity zones than before. This increases accuracy and increases the time for calibration. The extended temperature uniformity zone is created by a new sensor basket and a temperature equalizer and a speedier magnet stirrer. Since the uniformity zone is extended vertically the sensing element on smaller sensors can now be able to be in it, leading to better calibrations.

One difficulty in calibration of sensors that are sanitary is that traditional bathing methods result in uneven heat transfer to the flange of the sensor due to liquid flow and changes in level. The RTC168 temperature calibrator comes with a patent-pending method for liquid calibration of sanitary sensors. This allows users to replicate the field usage during their liquid calibration, which leads to a sensor calibration that closely matches the day-to-day use.

The new design of JOFRA isolates the liquid inside the main block from excess liquid surrounding the flange. This eliminates the liquid flow effect and allows for calibration under multiple conditions. The heat transfer to the flange happens through the aluminum of the heat conveyor rather than through the liquid, creating a much more reliable transfer. In addition the heat conveyor improves the circulation of liquid inside the block for the calibration of the sanitary sensors.

The RTC-168 calibrator features an industry-first reverse-flow cooling technique. This cools the calibrator by moving the hot air to the bottom, not to the top. This technique protects the sensor of the customer from heat and creates the most secure environment for technicians.

Image Credit to: Ametek STC

The RTC168 calibrator includes a removable liquid container. The two biggest challenges when using a dry/wet combination calibrator is the cleanliness and time to switch from wet dry to dry. This problem has been solved by the use of a liquid container that can be taken away. If the user wants to switch from dry to wet, they now only need to remove the container and it’s all set to go,” said Harslund. The container has a screw-on lid and a pressure relief valve. This makes the transportation of the calibrator simple and secure.

The RTC-168 is a combination dry and wet bath temperature calibrator. It can be used in liquid or dry conditions. The internal reference’s accuracy is +-0.18degC in dry mode, and as high as +-0.14degC in liquid mode. Utilizing the external reference sensor, these accuracy levels increase to +-0.09degC and +-0.06degC respectively. The RTC-168 is a great calibrator for industries that are highly demanded such as pharmaceuticals and food industries. It has a stable of +-0.01degC.

Haakon Harslund added, “We are very proud of our team’s ability to design and produce this innovative calibrator at such a difficult period of. Our team was able continue to collaborate and develop a creative develop while working from home. The result is a calibrator that we are confident that our customers will appreciate, and which we are proud of.”


AMETEK STC manufactures, supplies and maintains calibration equipment for temperature and pressure under the JOFRA or Crystal brands. The reliability and ease-of use of JOFRA temperature calibrators is a sign of their quality. For more information, visit

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Gemma Wilson

Gemma is a journalism graduate with keen interest in covering business news – specifically startups. She has as a keen eye for technologies and has predicted quite a few successful startups over the last couple of years.

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