Thank you for your information
This is Derek from Taiwan. The kiln that had reached 1516â„ƒwas built by my master, Mr. Lin. As he doesn't speak English, I am here to respond for him.
Mr. Lin uses type R thermocouples as thereâ€™s only type K and R in Taiwan.He havenâ€™t used any cone for over 10 years as he tried type R thermocouples,cone 16, PCTR, and Infrared thermometer once in his horizontal wood firing kiln ten years ago. The cone melted into liquid, and both TCPC and Infrared thermometer indicated over 1500â„ƒwhen the peak pyrometer read 1447â„ƒ with type R thermocouples. He took the pyrometer reading and decided not to use cone ever since. In his way of firing in the last 10 years, he always reaches peak at between 1380-1420â„ƒ and maintain the temperature over 1300â„ƒover 12 hours.
This very kiln that hit 1516â„ƒis a downdraft style wood firing kiln built by him in May, 2012. Within the 54-hour burning process, temperature was remained over 1400â„ƒover 12 hours, and we hit temperature over 1500â„ƒ over five times in 8 hours.
He will open the kiln this Saturday and we will post the picture to share with everybody ASAP.