Fluke Calibration 5628-12-L Secondary Standard PRT

Overview

The Fluke Calibration 5628-12-L is a high-temperature secondary standard platinum resistance thermometer (PRT) designed for calibration work up to 660°C. With a strain-free sensor design and 25.5 Ohm nominal resistance, this probe meets all ITS-90 requirements for resistance ratios and provides reliable, low-drift performance for laboratory and industrial calibration applications.

Unlike standard PRTs, the 5628 series is specifically engineered to reduce contamination risk at temperatures above 500°C through internal protection while maintaining excellent performance and stability.

Key Features

• Temperature range: -200°C to 661°C
• Nominal resistance: 25.5 Ohm
• Probe length: 305 mm (12 inches)
• ITS-90 compliant with strain-free sensor design
• Temperature drift: < 20 mK after 500 hours at 660°C
• Designed by Hart's SPRT engineers for high-temperature stability
• Internal protection against platinum contamination
• Includes accredited calibration and ITS-90 constants

Applications

• Temperature calibration work with block calibrators and furnaces
• Check standards for calibration laboratories
• Working standards for high-temperature measurement points (above 420°C)
• Calibration reference for aluminum point (660.67°C) and above