Measuring temperatures on metal with infrared technology by Optris
In the production as well as in the processing of metal, the monitoring of the temperature with non-contact sensors does not only help in the surveillance and optimization of the procedure, at temperatures of up to 3,000 °C (5,432 °F), it also improves workplace security.
Continous temperature monitoring is a key factor in the rolling mill, within the induction hardening or die forming process. For these purposes, Optris has developed infrared measurement devices that are especially suited for high temperatures and rough environment of the metal industry, since non-contact temperature measurement on metal is not quite as easy, as our technicle article Non-contact temperature measurement on metal surfaces via infrared technology demonstrates.
The following articles will introduce you to several application examples. Should your application be missing, please have a look at our metal brochure or contact our application engineers to help you choose your ideally suitable infrared measuring device.
At a rolling mill, a continuous measurement of forming temperature between individual rolls leads to an optimzed process control and quality assurance. As a rolling mill consists of various stations, we recommend two devices: A fast pyrometer for sheet temperature measurement and a ratio pyrometer for the cooling chamber and wire temperature measurement.
Within the die forming process the temperature of the blank needs to be measured before it is getting hot formed. Furthermore, the formed part should be measured after forming and before the storage. It is basically recommended to use either an online pyrometer for permanent temperature monitoring or a handheld device for sporadic measurements.
Maintenance within the metal industry helps with the early detection of wear in the refractory lining of torpedo cars, slag cars, and ladles. The scheduled maintenance reduces or eliminates the risk of metal runouts. An online thermal imager is recommended for a permanent monitoruing and automatic alarming on detection of hot spots on the outer wall.
Within induction hardening processes, the adherence to an optimum temperature-time profile is essential in order to achieve the desired microstructure of the metal. The process temperature lies between 700 and 1,100°C (1,292 and 2,012 °F) and it is recommended to use an online pyrometer for permanent temperature monitoring and/or a handheld for sporadic measurements.