The new ATC125 temperature calibrator from Jofra, which works down to –90°C, is one of many exciting new products launched recently by the company.
Traditionally, dry-block temperature calibrators used Peltier thermo-electric elements to generate sub-ambient temperatures. Now Jofra has developed an entirely new technology, using a free piston sterling cooler, which offers a calibration range from –90 to +125°C.
This development has been driven mainly by the pharmaceutical industry, which uses super-freezers that require calibration down to –85°C. Many other applications are health related, checking long term cold storage for meat down to –80°C and freeze driers down to –50°C. Industrial applications are mainly focused on the LPG and LNG industries, with marine tankers seen as a major market.
According to Jofra, existing calibration solutions are based on conventionally refrigerated liquid baths which suffer from some fairly severe drawbacks. Liquid baths are heavy, slow, and require different fluids to cover a wide range. Using a dry-block such as the ATC125 avoids these problems. The weight of the unit is only 20 kg, making it truly portable. The B version can store complete work orders in internal memory, allowing fully automatic calibration in the plant, without being connected to a host computer. The ATC125 is safe to operate, with none of the environmental hazards associated with volatile or fluorocarbon liquids. There is no need to change liquids halfway through a calibration, or watch out for water contamination below the dew-point.
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