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Thursday 21 October 2021
Posted in Thermocouple Information by Pyrosales

How do thermocouples help in Furnaces, Kilns and Ovens Industries?

IndustriesPyrosales has developed a strong reputation across many numerous processing and manufacturing industries as a dependable provider of precision temperature measurement instruments and complementary accessories. Our products include precision temperature instruments and gauges such as infrared thermal imaging cameras and related products, Bi-metal and gas filled temperature gauges and thermocouples along with high quality accessories, such as thermowells, fittings and connectors.

We can design, fabricate, and repair temperature monitoring and process control instruments for businesses across many industries.

Industries serviced by Pyrosales:

Glass Iron Steel Petrochemical Aluminium Copper Lead Zinc Power generation Food and Beverage Plastics Aerospace Furnaces, ovens and kilns Civil Construction Commercial Building Fire safety

These industries require precision temperature gauging instruments to monitor and control their processes and for identifying faults, allowing continued productivity, efficiency, and safety.

Furnaces, Kilns and Ovens

Energy costs continue to rise, so it is critical to maintain the control of temperature in furnaces, kilns, and ovens to minimise energy consumption, costs and, pollution emission. Infrared thermal temperature controls provide an optimum solution to monitoring the extreme conditions in high heat equipment where contact temperature measurement is difficult.

New Picture 1 imageFurnaces and kilns often present harsh conditions, with high temperatures and demanding environments, requiring the use of specialised temperature sensors, such as thermocouples. This, combined with the correct digital temperature controller, will ensure that the most effective control is implemented. There are numerous options when it comes to selecting the correct thermocouple and most appropriate thermowell or protection sheath. This is dependent on the operating temperature the instruments must withstand. Platinum-based thermocouples (Type R, S and B) are essential for use in high temperature processes above 1250°C. For temperatures below 1250°C, the use of high-cost platinum-based thermocouples can be avoided in some cases by utilising a designed thermocouple system using Nicrobell® or equivalent sheathed type N mineral-insulated thermocouples.  In lower temperature environments, such as some ovens, it may be appropriate to use an RTD if the temperature is not going to exceed 600°C. A digital temperature controller provides precise monitoring of the environment to ensure you have complete control of the temperature.

 Infrared Thermal Imaging and Infrared Sensors

testo 875 1i versatilethermal imager 1 imageThermal Imaging Cameras are an effective way of checking the integrity and insulation of any furnace, oven, or kiln, by inspecting the exterior while the oven is in use. If the environments do not allow contact temperature measurement, the use of Infrared thermal temperature gauges and thermometers may be the most appropriate solution to ensure an accurate measurement.

Thermowells/Thermocouple Protection Sheaths

For thermocouples to perform successfully and survive the harsh environments present in high temperature applications, it is necessary to install the thermocouple in a thermowell or a protection sheath.

Screenshot 2021 09 03 103559 imageCeramic TubesMetal thermowells or sheaths can be used up to 1200°C, however, they need to be carefully selected. Factors to consider include atmosphere and chemical composition of the process medium. Materials such as 310SS, Inconel, 446SS, and 253MA, as well as many other more exotic metals are all available to provide the most appropriate interface.

Higher temperatures require ceramic protection sheaths. There are various option available, such as Alumina, Hexaloy ®SE, Metal Ceramic, Silicon Nitride, Silicon Carbide, Zirconia or Sialon.

Pyrosales’ engineers have over 40 years’ experience producing specialised solutions for high temperature applications. Whether this is an infrared temperature monitoring system or a more traditional contact temperature system, we can design and supply the most effective temperature and process control equipment for furnaces, ovens, kilns, and other extreme heat applications.

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