Abstract
This article covers the topic of temperature measurement on top of a gas burner fire in order to recognize pot removal from a gas burner and subsequently, to cut off the gas supply. The possibility of applying a factory-mounted thermocouple was investigated with the assumption that its output signal could be used to detect the presence of a pot on a gas burner. However, the characteristic of such a thermocouple is not fully linear and as the research has shown that such a thermocouple would not fit enough for the assumed purpose, thus another sensor needs to be used. Therefore, in this paper, the linear thermocouple and IR diode are used. The best localizations of theses sensors were investigated in order to obtain a signal suitable for the pot presence recognition over the burner. These investigations are supported by the use of an infrared camera. In the investigations, the temperature changes also caused by casual air blast or caused by increasing and decreasing the valve opening are recorded and analyzed. Finally, the changes of the thermocouple’s signals are used as an input signal to propose an algorithm for pot absence recognition over the burner. The microprocessor-based circuit with a control unit for detection of the pot absence is designed, built and investigated.
Highlights
Different methods have been developed for the measuring of different flame temperatures [1,2].These methods can be divided into probe thermometry, optical thermometry, flame gases density based and laser-based measurements
If there is no flame on a burner, the energy generated by the thermocouple is too small to sustain the valve opening and as a result the valve switches off the gas supply
The results showed an increase in critical mass flux with a decreased heat of combustion
Summary
Different methods have been developed for the measuring of different flame temperatures [1,2]. In every gas home cooker produced nowadays, a thermocouple is used as the safety switch element, which cuts off the valve when there is no flame in the burner. Some producers use additional switch or infrared sensors to detect the presence of the pot and to switch off the gas valve Such solutions are cumbersome in practice because these sensors are soiled and their effectiveness deteriorates; their application does not guarantee the required reliability. In order to propose a more convenient and more reliable solution to improve pot detection on a burner, research on the possibility of using a thermocouple or IR diode output signal has been undertaken in this paper. The results of the gas flame temperature measurement are presented when the pot was put on and removed from the gas burner. The presented solution in this paper has not yet been offered by any gas cooker manufacturer
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