ELPRO LEPENIK Calibration Laboratory We offer field calibration of furnaces up to 1200 °C with our advanced measuring equipment and thermocouples, which are the result of our development and production.
|Calibration of high-temperature furnaces is essential to ensure the accuracy and reliability of temperature measurements in industrial and laboratory processes. In this article, we present an example of a field calibration carried out at a client’s site. We will describe the steps we took during the calibration, including the use of the necessary equipment and measuring instruments.|
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.
The data collected was then evaluated in the laboratory and graphically displayed. We analysed the temperature values obtained at different time intervals. Based on these results, a calibration certificate was prepared, containing the values of the measurements obtained.
The field calibration of the temperature furnace has been successfully carried out. The analysis of the results showed that the temperature measurements reached the expected values and met the client’s requirements.
Calibration of high-temperature furnaces is essential to ensure accurate and reliable temperature measurements in industrial environments and laboratories. The entire calibration process was carried out in accordance with ISO/IEC 17025. The example of field calibration presented in this article illustrates the importance of careful preparation, using the correct measurement equipment and analysing and evaluating the data obtained. Properly performed, calibration can ensure high-quality and reliable measurement results and increase the efficiency and reliability of industrial and laboratory processes based on high temperatures.
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They are always available for opinions and explanations:
Aleksandra Lepenik, expert in temperature measurements
Measurement expert Zoran Lepenik
Mojca Kugler and Žiga Grušovnik, May 2023