AMETEK STC Unveils the JOFRA RTC‑168: Precision Calibrator for Sanitary Sensors

Allerød, Denmark – Calibrating sanitary sensors, used extensively in the pharmaceutical and food industries, has long been a technical challenge. The small size of these sensors makes it difficult for technicians to position the sensing element within the uniform temperature zone of traditional calibrators.

AMETEK STC addresses this issue with the launch of its JOFRA RTC‑168 Reference Temperature Calibrator. “We have extensive experience in producing the highest‑quality temperature calibrators. This knowledge helped us design the new RTC‑168, which incorporates an industry‑first innovation and several performance enhancements,” said Haakon Harslund, Director of Engineering.

Enhanced Well Design for Greater Accuracy

The RTC‑168 features a new well geometry that brings sanitary sensors with large flanges closer to the temperature‑uniform zone, resulting in more accurate readings and faster calibration times. A redesigned sensor basket, combined with a temperature equalizer and a high‑speed magnetic stirrer, extends the uniformity zone vertically, allowing even short‑sized sensors to reach it.

Patent‑Pending Liquid Calibration Technique

Traditional bath methods often suffer from inconsistent heat transfer caused by liquid flow and level changes. The RTC‑168’s patent‑pending technique isolates the liquid in the main block from the excess surrounding the flange, eliminating flow effects and obviating the need for a precise liquid level. Heat is transferred through an aluminium heat conveyor rather than the liquid, ensuring consistent transfer and optimized circulation.

Industry‑First Reverse‑Flow Cooling

The calibrator also introduces a reverse‑flow cooling system that expels hot air from the bottom instead of the top. This protects the sensor under test from overheating and provides a safer environment for technicians.

Removable Liquid Container

Switching between wet and dry calibration modes is now as simple as removing a small, screw‑on lid container equipped with a pressure‑relief valve. This design reduces cleaning time and enhances safety during transport.

Performance Specifications

• Operating range: –30 °C to 165 °C (wet and dry)
• Internal reference accuracy: ±0.18 °C (dry), ±0.14 °C (wet)
• External reference sensor accuracy: ±0.09 °C (dry), ±0.06 °C (wet)
• Stability: ±0.01 °C

The RTC‑168’s precision makes it an ideal tool for the stringent requirements of the pharmaceutical and food sectors.

“We are proud of our team’s ability to design and produce this innovative calibrator even during challenging times. Their collaboration and creativity, performed from home, resulted in a product we know our customers will value,” added Harslund.

For more information, visit www.ametekcalibration.com.