Williamson noncontact temperature sensors


Williamson is dedicated to providing unique and creative solutions for Industrial Heat Processing applications. We offer a comprehensive line of industrial temperature sensors, as well as several innovative technologies for applications considered difficult to measure.

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Some significant sensor features include a patented single-wavelength Auto Null Design, a high-performance Dual-Wavelength Design, a patented Multi-Wavelength Design, and a variety of flexible Fiber Optic Systems. Combining these unique capabilities with our extensive heat processing application experience, Williamson can provide superior performance for both traditional and difficult to measure applications.


Greater accuracy, repeatability & reliability for temperature measurement & control
Williamson’s noncontact temperature sensors measure the amount of infrared energy emitted from an object’s surface and convert that signal into a temperature value. While many factors affect the measurement accuracy, an important consideration is the selection of the sensor design that most effectively compensates for the emissivity characteristics of the measured surface.

Emissivity is a technical term used to quantify the amount of energy emitted from a surface relative to its theoretical maximum for a given temperature. In general, most materials and applications exhibit a high and constant emissivity that reflects “near blackbody” conditions. For these applications, a single-wavelength sensor is recommended. However, for most metal applications where the surface emissivity is lower and can vary, the dual- and multi-wavelength sensors are recommended.

The table below highlights Williamson’s unique capabilities to effectively compensate for emissivity and to outperform all others, particularly when measuring ferrous and nonferrous metals.

Temperature Application Recommended sensor Design & Models Unique capability
Most ferrous metal applications which exhibit greybody
Below 250° C
These sensors provide greater accuracy and repeatability for low emissivity applications at temperatures as low as 125°F (50°C).With infrared filtering in the 2 micron range, errors due to changes in emissivity are minimized or eliminated. While the Patented Auto Null Design eliminates noise and calibration drift often associated with this type of sensor.
Above 300°F (150°C)
Dual Wavelength
These High-Performance Dual-Wavelength Sensors provide greater accuracy and repeatability on metal applications with emissivity variance and temperatures over 300°F (150°C).With an exceptionally high signal dilution factor, these sensors outperform all other ratio sensors.
Dual-Wavelength Features

  • Automatic Emissivity Compensation
  • Views through Dust & Dirty Optics
  • Views through Water Spray
  • Compensates for Scale & Oxide Formation
  • Measures the Hottest Temperature Viewed
  • Long-Term Calibration Stability
  • Highest Signal Dilution Factor Available
Most Nonferrous Metal Applications Which Exhibit Non-Greybody Conditions Above 400°F (200°C)
Multi Wavelength
With a Patented Multi-Wavelength Design, these sensors provide accurate and repeatable measurements of nonferrous metals such as aluminum, copper, brass, and zinc. This capability is a Williamson exclusive that combines multi-wavelength hardware with a blending algorithm specifically developed for these difficult materials



Authorized Dealer:
Masibus Automation & Instrumentation Pvt. Ltd.
B-30, GIDC Electronics Estate, Sectror-25, Gandhinagar- 382044, (Guj.),
Ph No: 079-23287275-79, Email: Sales@masibus.com, Web: www.masibus.com