Check Thermocouple Calibration

  1. Thermocouples will drift in reading over time.
  2. This could potentially lead to an overfiring before the thermocouple actually fails.
  3. Although you can not easily check thermocouple calibration, the general accuracy of the entire kiln system can be checked by firing with witness cones. See this link about calibrating your kiln.
  4. It is important to remember that thermocouples do not measure heat-work (which is all that matters in ceramics). You must calibrate your kiln control to match the performance of a cone to get the most accurate representation of the process.