Temperature Application Highlights

With a batch heating process, the product is heated to a setpoint temperature and held there for a period of time or removed immediately for further processing. To efficiently produce a quality product, it is important to accurately track the product temperature to the setpoint. When selecting a sensor, alignment and durability are important considerations depending on the product's positioning inside the furnace and the location of the sensor in the process.

Solution
Single-wavelength sensors are most often recommended for batch heating applications because the system geometry tends to reduce the sensitivity to emissivity variance at or near the process setpoint. Fiber optic sensors are often used to simplify the sensor installation and to eliminate requirements for water cooling the sensor in high ambient temperatures. When verification of sensor alignment is required, the visual sighted 4000 series, laser aiming, built-in aim light, or viewing tube options may be selected.

When heating with quartz lamps or exposed electric heating elements, single-wavelength sensors filtered at wavelengths longer than 4.8 microns are generally used to eliminate the interference of reflected energy.