How to Measure the Temperature Inside of a Furnace/Kiln
Are you skeptical about your temperature probe calibration? Are you trying to measure a high temperature inside your furnace that thermocouples won't handle? Does the part get enough energy even if the temperature is right?
The belt furnace/pusher kiln, as the Non-Standard Product, could have a various temperature range. In the past 30 years, THT/Hengli has designed all kinds of heat treatment devices. Some of them has a really high temperature and the thermo probe won't resist that heat. To those situations, we recommend our customer to use pyrometric cones, a device that uses melting as an indicator of the temperature and time.
We recommend our customer put 5 of the pyrometric cones in a row. Pyrometric cones are made from controlled compositions. Each cone number is unique in measuring temperature within a small temperature range. Cones measure the amount of heat absorbed. As the cone nears its maturing range, it softens and the tip begins to bend, drawn down by the influence of gravity or the weight of the sensing rod for cones used in the Kiln-Sitter. Each higher cone number requires more heat to bend. Faster heating rates require the cone to be heated to a higher temperature.
Nowadays, furnace users don't need to use pyrometric cones as often as the old time, thanks to the accuracy and maturity of the temperature-censoring devices and computer situations. A good furnace can save money from defective products and time for factory technicians. However, the pyrometric cones is still needed sometimes and it is still an efficient way to measure/calibrate the system.
A good belt furnace can save more time and money from defective products.