Fluke 5628-12-D, PRT Probe, 304mm Length, 6.35mm Diameter, 661 °C Max

The Fluke 5628-12-D features a 304 mm immersion length and a 6.35 mm diameter sheath, enabling it to reach deep into calibration wells, furnaces, and thermal chambers. Its robust outer sheath is designed to endure prolonged exposure to extreme heat. Moreover, the slim profile improves thermal response while maintaining structural strength. Its rigid construction ensures consistent positioning inside calibration blocks, minimising measurement drift caused by movement or uneven heat distribution.

Electrical Performance and Sensing Technology

The probe is optimised for ultra-stable resistance behaviour over a wide temperature range, enabling precise conversion of resistance to temperature during calibration procedures. The probe is typically used in four-wire measurement configurations, which help eliminate lead-wire resistance errors. This setup significantly improves low-uncertainty readings, especially in metrology-grade temperature verification environments.

Real-World Applications of the Fluke 5628-12-D PRT Probe

This PRT probe is widely used in industries and facilities to ensure product quality, safety, and regulatory compliance, including:

• Temperature calibration laboratories
• Industrial furnaces and heat treatment systems
• Power generation and thermal processing plants
• Research and development testing environments
• Aerospace and materials science facilities

How It Benefits Users

This probe maintains its dimensional stability and electrical consistency even after repeated exposure to high temperatures, which is critical in long-term calibration programs.

Key advantages include:

• Stable performance up to 661 °C
• Long immersion length for deep calibration wells
• Four-wire resistance measurement compatibility
• Built for repeated thermal cycling
• Suitable for traceable calibration workflows

For more information please check the datasheets.