Case History: Steel Mill Annealing...
Unequaled Performance for a Difficult Application
Williamson's new PRO Series multi-wavelength sensor is specifically developed to compensate for the challenging requirements of a steel mill annealing line. The sensor uses an ESP Algorithm that considers infrared energy, emissivity, and the measured wavelengths to accurately calculate the strip temperature and the surface emissivity. The algorithm is a computer based empirical model developed from extensive data collected from off-line simulations and on-line trials. As the sample data below illustrates, one ESP Algorithm can be used for accurate measurement of most steel alloys, including, carbon steels, tool steels, dualphase steels, and high strength steels. Additional ESP Algorithms exist for stainless steels, electrical steels, coated steels, and high temperature steels.
With the ability to measure temperature accurately under a wide range of operating conditions, the multi-wavelength PRO 110 provides the flexibility to install the sensors in more locations along the annealing line for greater control of process temperatures.
For straight-pass furnaces, one or more sensors are placed at the exit of the flame-heating section, the exit of the radiant-heating section, and at the exit of the cooling zone.
For serpentine-pass furnaces, multiple sensors are placed within several heating and cooling zones.
For hot dip lines, a sensor is placed at the snout.
For galvanneal lines, additional sensors are placed at the exit of the heating zone (often an induction heating system) and just before the "turn roll"where the coated strip must be below 650F (350C) before it contacts the roll and causes surface damage.
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