Temperature Measurement


Auto null ensures accuracy

December 2007 Temperature Measurement

Three types of infrared non-contact temperature sensors used for process monitoring and control are available - single, dual and multiwavelength pyrometers. The dual and multiwavelength sensors are used in applications where compensation for emissivity variance is required, or in applications subject to interference such as a partially filled field of view. The single-wavelength sensors are used when the measured target emissivity is relatively constant. Examples of applications where single-wavelength sensors are used in place of dual or multiwavelength sensors include - temperature measurement below the lower limit (150°C) of dual-wavelength sensors, reflective targets in hot backgrounds.

Williamson's PRO 42, 43 and 52 Sensors use an auto null balancing design to enable more accurate and repeatable measurements on low temperatures and variable emissivity applications. Typical of these are aluminium and steel strip coating, aluminium ageing, low temperature induction heating, steel tempering, metal coating, thermal spray and thermal expansion applications.

For more information contact Andy Brown, Temperature Controls, +27 (0)11 791 6000, [email protected], www.tempcon.co.za



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