Accurate Temperature Measurement in the Roadstone Industry Today's roadstone plants are facing ever increasing demands for tighter quality control and many have now introduced quality assurance schemes to ensure that material leaving the site is within specification. The temperature of the material, both during production and prior to leaving the site is measured as part of this quality requirement. Temperature measurement of the material during production can improve the control of the process and give significant savings in energy costs. Temperature measurement using thermocouples are not recommended because the slow response time introduces lags in the system, which ultimately results in poor control. Damage and wear caused by being in contact with the product means that thermocouples are unreliable and have constantly to be replaced. Land developed non contact infrared thermometers for this application and have over 30 years experience in the roadstone industry. The RT8A with its linear, industry standard 4 to 20mA output signal, interfaces with all types of low cost indicators, controllers and recorders. RT8A thermometer features and benefits: • Faster response. • No interference with the material or process, or damage to the measuring system. • Accurate, reliable and stable temperature measurement to aid product quality control. • Saves energy and heating costs. • Maximizes production rates. The RT8A thermometer can be used on all roadstone applications. • Drier exit chute for measurement and control of aggregate temperature. • Mixed material temperature in the mixer. • Coated roadstone mixer/storage bin end. • Drum mix plant, coated material temperature at the collector box (drum exit). When the RT8A is used in the roadstone industry a standard 12 month warranty is offered. Non-Contact Temperature Measurement Solutions Land Instruments International Ltd Dronfield S18 1DJ, England • Tel: +44 (0) 1246 417691 Email: [email protected] • www.landinst.com AMETEK Land, Inc. 150 Freeport Rd., Pittsburgh, PA 15238, U.S.A. • Tel: +1 412 826 4444 Email: [email protected] • www.ametek-land.com For full details of all international offices and distributors please visit our websites

Drier Exit Chute The RT8A thermometer sights onto a stream of aggregate at the exit chute. The thermometer output can either be used to indicate aggregate temperature, or utilised in a closed loop control system to control the burner, thus minimising fuel wastage and maximising efficiency whilst controlling aggregate temperature. Mixing Material (Batch Heaters) Due to the batch nature of the mixing process, automatic burner control is not possible, but knowledge of the hot stone temperature and its subsequent effect on the binder and filler temperature is a useful aid to process control. Once...