Contribution Oral Presentation
NOVEL APPROACH TO REDUNDANT STRIP TEMPERATURE MEASUREMENT ON CONTINUOUS COATING LINE FURNACES
- Joyce NIEDRINGHAUS
- Joyce NIEDRINGHAUS (AK Steel Research & Innovation Center)
The conventional configuration for strip temperature measurements on continuous horizontal annealing furnaces is a single pyrometer pointing down a water-cooled sight tube positioned normal to the strip surface. When on-line testing of different make and model pyrometers is desired, the control pyrometer has to be removed, which often restricts the timing and duration of the test. The desire to use these existing pyrometer ports drove the design and fabrication of a housing adapted for two pyrometers, i.e., a dual-pyrometer mounting fixture.
A key feature of each fixture is a unique optical mirror that directs the line of sight of both pyrometers down onto the strip. Both pyrometers view and measure emitted infrared energy from the same spot on the heated strip. Two highly polished surfaces of the optical mirror have a hard and stable, pure gold-plated coating, making them highly reflective.
Validation tests confirmed the use of these gold surfaces does not alter the temperature readings. In addition to redundant temperature measurements, concurrent testing of pyrometers (single, multi- and dual wavelength, different manufacturers) is now possible, permitting direct comparisons without interruption to the primary control pyrometer.
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pyrometer, IR pyrometry, strip temperature measurement, continuous hot dip coating line, galvanizing,