Pyrometer overcomes molten metal problems
An
Impac Infrared product story
Edited by the Engineeringtalk editorial team
Feb 14, 2006
Dual-wavelength pyrometer detects emitted radiation at two wavelengths and the mathematics show the resultant temperature measurement becomes mainly independent of the emissivity of the pouring metal.
Impac Infrared has developed instruments to overcome the problems with the measurement of molten metal pouring streams, an application that has always been considered difficult with infra-red pyrometers.
The surface of a pouring stream of molten metal produces thin oxide layers, which have to be taken into consideration for infra-red measurements since the emissivity of these layers varies significantly from the emissivity of the actual metal being poured.
For this reason, the firm recommends a dual-wavelength (ratio) pyrometer is used.
These pyrometers detect the emitted radiation at two wavelengths and the mathematics show that the resultant temperature measurement becomes mainly independent of the emissivity of the pouring metal.
However, a standard ratio pyrometer alone will not be successful for many pouring stream measurements, since there are other influencing factors that can give rise to incorrect readings.
The main problem being that at the beginning and end of the pour, the stream can break up and the pyrometer becomes confused by the significant change in the stream appearance.
Recognising this problem, Impac has introduced the Isar 12-LO/GS, which has application specific signal conditioning to remove those parts of the reading to provide only the valid temperature data needed for temperature control.
Impac has also introduced the IS 8-GS handheld instrument for pouring stream measurements.
This single wavelength instrument works at a very short wavelength and incorporates software for overcoming the identified problems of measuring molten metal streams.
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Contact Impac Infrared
Tel +44 1246 269066
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