Williamson

Williamson is a family-owned manufacturer of exceptionally accurate infrared pyrometers for industrial applications. Williamson is passionate about helping customers solve challenging temperature measurement problems so that they can improve product quality, increase process efficiency, and control costs. We recognize that each application has its own unique challenges and for over 60 years, Williamson has developed customized solutions for the most demanding industrial applications.

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Pyrometers

Short-Wavelength (SW) Pyrometer

ProSeries Pyrometer

ProSeries Pyrometer

Williamson places a strong emphasis on short-wavelength single-wavelength pyrometers because of their ability to better tolerate emissivity variation and optical obstruction.

  • Short-wavelength sensors are often 4-20 times less sensitive to emissivity variation compared to long-wavelength sensors
  • By selecting the correct wavelength span, Williamson pyrometers make it possible to view through water, steam, flames, combustion gases, and plasmas.

As a result, Williamson short-wavelength pyrometers provide superior performance over a wide range of real-world operating conditions. For most applications, selecting the shortest practical wavelength is recommended. As indicated in the chart, shorter wavelengths result in smaller errors and are 4-20 times less sensitive to emissivity variation compared to long-wavelength sensors.

Short-Wavelengths Can View Through Optical Obstructions Wavelength selection is a critical factor in Williamson’s short-wavelength technology. By choosing the correct wavelength span, you can view through water, steam, flames, combustion gases, plasmas and other common industrial interferences.

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Specialty-Wavelength (SP) Pyrometer

ProSeries Pyrometer

ProSeries Pyrometer

Specialty-wavelength pyrometers are used when the target is least reflective and most opaque at a specific wavelength or when optical obstructions are most transparent at a specific wavelength. For example, at 7.9um polyester film is opaque. So, pyrometers filtered at this special wavelength are appropriate for making this measurement.

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Long-Wavelength (LW) Pyrometer

ProSeries Pyrometer

ProSeries Pyrometer

Long-Wavelength (LW) pyrometers tend to be lower in cost, but when measuring temperatures above 100˚C / 200˚F, errors can be large due to optical obstructions, misalignment, and emissivity variations. These are general purpose sensors are used for many low-temperatures or near ambient measurements and high emissivity materials.

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Dual Wavelength (DW) Pyrometer

ProSeries Pyrometer

ProSeries Pyrometer

Dual-wavelength pyrometers use two separate and distinct wavelength sets on a filter wheel. Because the design allows for separate wavelengths, these wavelength sets can be independently selected and combined allowing for some unique capabilities.

  • Compensate for variable emissivity, temperature gradients, severe optical obstructions, and misalignment
  • Select wavelength sets tolerate water, steam, flames, combustion gasses, plasma, and laser energy
  • Separation of wavelengths produces a heavily weighted reading towards the hottest temperature viewed
  • Available in broad temperature spans and low-temperature ranges
  • Includes ESP filtering to continuously measure intermittent targets or eliminate intermittent interferences

Dual-wavelength pyrometers offer two different and selectable wavelengths allowing for all the benefits of a two-color pyrometer plus some additional capabilities.

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Two-Color (TC) Pyrometer

ProSeries Pyrometer

ProSeries Pyrometer

Two-color pyrometers use what is called a “sandwich detector” using a fixed set of wavelengths, meaning that two wavelength filters are laid one on top of the other. One wavelength is a broad waveband (0.7-1.1um for example) and the other wavelength is a narrow waveband (1.0-1.1) that is a subset of the broader band.

  • General purpose wavelength set
  • Can tolerate modest optical obstructions, misalignment and partial field of view
  • Compensate for variable emissivity
  • Used when there is a clear optical path between the pyrometer and target
  • Can only measure temperatures above 1100°F / 600°C

Keep in mind that two-color pyrometers cannot view through common optical interferences, so it is critical to avoid water, steam, flames, combustion gasses, plasma and laser energy for the most accurate and repeatable results.

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Traditional Multi-Wavelength (MW) Pyrometer

ProSeries Pyrometer

ProSeries Pyrometer

MW Pyrometers provide consistent and accurate measurements with non-graybody 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.

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Dynamic Multi-Wavelength (MWx) Pyrometers

ProSeries Pyrometer

ProSeries Pyrometer

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.
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Flare & Pilot Monitors

Pilot Monitor (PM)

Explosion Proof Flare Monitor

Explosion Proof Flare Monitor

The Williamson Pilot Monitor (PM) utilizes proven dual-wavelength technology to sense the presence of the small, distant pilot flame. This technology allows the pilot monitor to view clearly through severe weather conditions caused by fog, wind, rain, snow and sleet.

  • Self-regulating means no on-site calibration
  • May be grade-mounted for easy access
  • 30% greater sensitivity means greater reliability
  • Includes Signal Dilution output for measurement validation and diagnostics
  • Large viewing area for easy alignment

Flammable vent gasses are ignited by a pilot flame when released into the atmosphere by refineries, natural gas processing plants, and petrochemical plants. The proper incineration of these gasses is a critical safety and environmental concern. Therefore, it is essential to confirm that the pilot is always lit. Monitoring via a thermocouple is common, however failures frequently occur, and replacements can require costly process shutdowns. Remote sensing IR technology (PM) is the superior alternative.

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Flare Monitor (FM)

Explosion Proof Flare Monitor

Explosion Proof Flare Monitor

The Williamson Flare Monitor (FM) utilizes proven dual-wavelength technology to monitor the ratio of carbon to available oxygen deep within the hot flare flame. This ratio value correlates to combustion efficiency and is used to adjust the flow of air or steam to smokeless flares, assuring smoke-free operation and maximum combustion efficiency.

  • Assures smoke-free operation and maximum destruction of VOC gasses
  • One control setpoint for all hydrocarbon (H-C) vent gasses means no on-site calibration
  • Uninfluenced by flame size or position within the field of view
  • Uninfluenced by flame composition for all H-C gasses
  • Unaffected by stack configuration or presence of steam
  • Includes extra measured parameter values for confirmation and diagnostics
  • May be grade-mounted for easy access
  • Used for Manual or Automatic feedback to control steam or air flow
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Flame Intensity Monitor (FI)

Explosion Proof Flare Monitor

Explosion Proof Flare Monitor

The Williamson Flame Intensity Monitor utilizes single-wavelength technology and thoughtful wavelength selection to sense the presence and intensity of flames of all types. The FI class sensors are ideal when viewing hydrogen, ammonia, CO and other flames. This lower-cost technology is also commonly used as a pilot flame detector for ground flares and landfill flares where the viewing distance is less than about 300 feet or 100 meters.

  • Thoughtful wavelength selection for maximum sensitivity
  • Model FI2 is recommended for Hydrogen and Ammonia, Model FI5 is recommended for CO Flames
  • Ideal as a Pilot Monitor for Ground Flares and Landfill Flares
  • Increased sensitivity compared to UV flame detectors
  • Adjustable Sensitivity for Optimum Performance

Williamson Flame Intensity Monitors (FI) are the single-wavelength sensors of choice for a variety of flare applications where the more sophisticated dual-wavelength flare products are not appropriate or are not required. Products specifically designated for flame intensity monitoring applications include: Pilot Monitoring of Hydrogen, Ammonia or CO Flames; Pilot Monitoring of Ground Flares and Landfill Flares; Flame Intensity Monitoring

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