Overview

The document discusses the importance of optical temperature measurement in strip galvanizing plants to ensure optimal zinc coating adhesion and product quality. It highlights the role of pyrometers in monitoring temperatures at various stages of the galvanizing process.

Key Sections

• Preheating Measuring Point: The preheating furnace is the initial stage where the base temperature is monitored using a CellaTEMP® PA 20 AF 1 pyrometer.
• Annealing Furnace Measuring Point: The annealing furnace heats the steel strip to reduce material stress and improve mechanical properties. The CellaTEMP® PA 40 AF 20 two-colour pyrometer is used for temperature monitoring.
• Cooling Measuring Point: Post-annealing, the strip is cooled to match the zinc bath temperature. The same pyrometer model is used to ensure accurate temperature readings despite potential disturbances.
• Measuring Point Before Zinc Bath: The strip must reach 450°C to 480°C before immersion in the zinc bath. The CellaTEMP® PA 60 AF 1 pyrometer ensures precise temperature control to prevent coating defects.
• Top Roller Measuring Point: The strip is cooled before reaching the top roller to prevent surface damage. The CellaTEMP® PA 29 AF 10 pyrometer, equipped with an optical blocking filter, is used here.
• Cooling Section Measuring Point: Measurement in a roller gap is used to accurately determine the strip temperature, utilizing the black body radiator principle to enhance emissivity.

Conclusion

Precise temperature measurement is crucial for high-quality zinc coating, optimizing energy consumption, and ensuring efficient production processes. Modern pyrometer systems provide reliable temperature monitoring and control.

Technical Specifications

• Various pyrometers are specified for different temperature ranges and spectral ranges, with specific mounting combinations for optimal performance.

Standards and Certifications

• The document references compliance with DIN EN ISO 9001, 14001, and 50001 standards.