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Williamson - Multi-Wavelength Pyrometers
Williamson is the only company that offers two types of multi-wavelength pyrometers. The MW and MWx pyrometers are used to measure the temperature of non-greybody materials. These are materials for which the emissivity not only varies, but varies differently at different wavelengths.
Williamson’s multi-wavelength pyrometers use application specific algorithms to characterize infrared energy and emissivity to accurately calculate the temperature of these complex non-greybody materials. Algorithms have been developed and refined from extensive data collected from off-line simulations and on-line trials. These pyrometers also have a real-time measure of emissivity, confirming valid temperature measurement conditions and alerting you of invalid conditions that require troubleshooting.
Typical Non-Greybody Materials
- Aluminum
- Magnesium
- Stainless Steel
- Brass
- Bronze
- Copper
- Zinc
MW Pyrometers provide consistent and accurate measurements with non-greybody materials under a wide range of operating conditions without any adjustments. The MW pyrometers use application specific ESP Algorithms to accurately correct for emissivity variations due to:
- Changes in alloy, surface texture, surface oxidation
- Abnormal operating conditions such as a furnace leak, bad roll, or reheated coil (Annealing Line)
The most common applications involve aluminum, steel, and copper. Each MW pyrometer can hold up to eight selectable algorithms so that the same sensor can be used for multiple applications.
The MWx pyrometers work differently than traditional MW technology which assumes that the surface conditions are relatively consistent. The MWx sensors use Dynamic ESP Technology to automatically compensate for more significant variation in surface character and conditions without any adjustments. The two applications which require the more advanced MWx technology are:
- Aluminum hot rolling mills where the surface character of the aluminum varies dramatically by alloy and pass as it goes through the reversing mill.
- High temperature (<900°F/480°C) aluminum billets where there is an elemental migration of aluminum to the outside billet surface that dramatically changes the emissivity of the billet surface.