One of the problems with moving product on open conveyor systems is the measurement of temperature of that product. Conventional contact principals like thermocouples and RTDs/PT100s are not suitable to drag in fast moving materials. Contact probes in slow moving and granular products still have problems like friction and static generation.
If you need to detect the movement of hot products or hot pieces of product then the response time of a contact system is far too slow and large volumes of over spec or dangerous product have to flow past the detector before an alarm can be generated.
A possible solution is the use of non-contact infrared thermometers. Infrared technology is not a new phenomenon, it has been utilised successfully in industrial and research applications for decades. New innovations have reduced cost, increased reliability and resulted in non-contact infrared sensors offering smaller units of measurement. All of these factors have contributed to infrared technology becoming an area of interest to all kinds of users in all applications.
The advantages of non-contact temperature measurement are:
* Speed of response - fast response to temperature changes in the millisecond range, dependent on unit.
* Moving target - measurement of small spots of hot product can be detected on open conveyors moving at speed.
* Hazardous and inaccessible processes - corrosive products are not touched and if you can see it you can measure it.
* High and low temperature ranges - you can measure anywhere between -50 and 3000°C by choosing the correct product to fit the application.
* No contamination - with no contact you cannot contaminate the product.
An innovation in infrared thermometers is the smart sensor (Raytek TXS Systems). This allows the user to adjust sensors remotely from the control room without interrupting the process. Temperature range, emissivity, filter and peak/valley hold parameters can all be changed from a distance with the HART protocol, standard on the Raytek TXS range.
The Raytek TX and MID systems have been used throughout South Africa and the world on materials handling systems. Large coal moving conveyors have Raytek systems integrated into their trip systems and any spike of temperature from a hot spot in the coal causes a trip so preventing the movement of fire to or from a stock pile.
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