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Williamson
70 Domino Drive
Concord, MA 01742

Phone: 800-300-8367 (U.S.A. Only)
978-369-9607

Fax: 978-369-5485

Williamson is a New England based manufacturer of infra-red temperature sensors. They make permanently mounted in-place sensors. They are very good at the very tough applications that other IR pyrometer manufacturers cannot handle. If you have tried non contact sensors to no avail then you might want to look at what Williamson has to offer. Recently they have introduced a new line of low cost IR sensors that make non-contact temperature measurement economically feasible.
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Here is an overview of the Williamson product line:

Two wire transmitters are economically priced and they still have optical options so you can tailor a sensor to handle plastic or hot metals or glass or use it in the presence of infra-red energy. You can also get these simple sensors with fiber optic viewing.

Single wavelength sensors with the availability and options you need to really make it work. Remember, Stapleman Corporation has 28 years of experience when it comes to applying Williamson technology.

Dual wavelength sensors have a unique design that makes them simply work better than other ratiometric instruments. Most ratiometric instruments use two sensors and must filter out most of the signal they get from the target. Williamson's dual wavelength technology uses a single sensor and two optical paths so it can use all of the energy from the target and give you a reading that is 100x more sensitive. That means you can see the temperature of thin wire; you can monitor hot metal being poured in a wavy stream; you can see an induction heated part through the splash of a quench, etc.

Ratiometric sensors are based on the idea that target size and emissivity do not count because the temperature is based on the ratio of two readings. However, with really bright metals such as aluminum and brass and many molten irons the reflections are so severe that they cause errors even in ratiometric sensors. To compensate Williamson has developed a multi-wavelength sensor which has a compensating optical path which counteracts the errors of the dual wavelength sensor.

The Pro100 Series pyrometer system has a microprocessor built into the sensor to make expert system adjustments in some of the toughest applications for infra-red temperature systems. The ESP algorithms are computer based empirical models that consider infrared energy, emissivity and measured wavelength to properly compensate for the irregularities of non-grey body materials such as:

Aluminum, Brass, Chromium, Stainless Steel, Copper, Molybdenum, Tin, Titanium, Tungsten, Zinc

Each multi-wavelength Pro Series sensor can include up to four menu selectible, factory programmed ESP algorithms as well as a dual/ratio mode. It is also easy to create advanced ESP models that combine the ESP algorithm with ESP filters to enable measurement of non-grey body materials under adverse operating conditions.