Calibration of a high temperature furnace

Initially, we checked the location and accessibility of the calibration gauge. We then set up a table near the calibration gauge, on which we installed a laptop with dedicated software and a digital standard gauge. The meter was connected to a thermocouple sensor (type K; up to 1200 °C), which sensed the temperature of the furnace. Reference measuring equipment was used, which is regularly maintained and checked as part of the regular checking of measuring equipment. As the ambient conditions need to be monitored throughout the calibration process, we have placed a temperature and relative humidity meter in close proximity to the measuring equipment. Before starting the measurements, we waited for all the measuring equipment to come up to temperature. This means that after transport and exposure to ambient temperature, the temperature of the measuring equipment is brought to the same temperature as the room temperature.

For field calibrations, the same calibration procedures as for laboratory work shall be used as a basis, with appropriate adjustments as agreed with the customer, who shall provide suitable facilities and conditions for calibration. In this case, we focused on the calibration of a high-temperature furnace operating at 800 °C. We chose measuring equipment that was suitable for this temperature range and a furnace design that we checked properly before going into the field. The benchmark was adapted to be placed in close proximity to the measuring section of the furnace, while ensuring adequate enclosure of the working space (insulation). We monitored the temperature rise in the furnace on a computer using the above-mentioned measuring equipment.

Once the stove had warmed up to the desired temperature, we then monitored its operation for some time to determine the temperature fluctuations during its steady state. After calibration, the specimen was provided with a calibration label.

After the calibration was completed, we switched off the oven and allowed it to cool down gradually. Cooling down too quickly or exposing it to room temperature too quickly would risk damaging both the stove and our reference measuring equipment. Once the stove had cooled down, we safely removed the measuring equipment. The measuring equipment was properly stowed in the protective transport cases provided, and we left the premises in the same condition as when we arrived. All the reference measuring equipment used was then checked again in our calibration laboratory.