Multi-Wavelength Pyrometer Technology

Some materials can be difficult or near impossible to measure with precision using single-wavelength or ratio pyrometers because of their complex emissivity characteristics. These types of materials are called non-greybody materials and their emissivity varies with wavelength. It’s important to choose the right industrial infrared thermometer technology for your application; multi-wavelength pyrometer technology is the perfect solution for measuring the temperature of these difficult materials.
mutli wavelength pyrometer surface emissivity characteristics

Typical Non-Greybody Materials

  • Aluminum
  • Magnesium
  • Stainless Steel
  • Brass
  • Bronze
  • Copper
  • Zinc

How Multi-Wavelength Pyrometers Work

  • Multi-wavelength pyrometers use application specific algorithms to characterize infrared energy and emissivity across the measured wavelengths to accurately calculate both the actual temperature and emissivity of these complex non-greybody materials
  • Algorithms have been developed and refined from extensive data collected from off-line simulations and on-line trials
  • Each multi-wavelength sensor can hold up to eight selectable algorithms so that the same pyrometer can be used for multiple applications

Multi-Wavelength Pyrometers

MW pyrometers are best for non-greybody materials as they are able 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)

With an MW pyrometer, consistent and accurate readings are achieved under a wide range of operating conditions, with no sensor adjustments.

MW pyrometers also have a real-time measure of emissivity, confirming valid temperature measurement conditions and alerting you of invalid conditions that require troubleshooting.

Popular Multi-Wavelength Applications

  • Aluminum & Copper: Extruded Surface, Rolled Surface, Cast Surface, Sheared Surface, Forged Surface, Brazing Operations, Coating Preheat, Dies & Molds
  • Steel & Zinc: Cold Rolled Steel, High Alloy Steels, Electical Steel, Zinc-Coated Steel, Shot-Blasted Pipe, High Strength Bearings, Motor Rotors
  • Other: Glass Molds and Plungers, Magnesium Strip, All Other Non-Greybody Materials Listed Above

Service & Support

MWx-AB - Aluminum Billets

MWx technology accurately measures high temperature billets where MW technology falls short. MWx pyrometer only works when looking at the side of the billet. No specific algorithm or offset is required – MWx-AB works across all alloys. Pyrometer output is set for 400-1100°F (200-600°C), but will only measure temperatures down to 575°F/300°C.