A: A variety of flame detection methods exist. Most designs utilize either a flame’s electrical continuity or its radiation to determine the presence of a flame. The basis of selecting which property to monitor is a decision made on the application, the fuel, the burner geometry and accessibility.
It is important to note that when a burner is to be operated continuously (more than 24 continuous hours by industry definition), the flame safeguard detection equipment must also be rated for continuous operation. This is necessary as some flame safeguard detection equipment can fail into a false positive mode. If that situation were to happen on a continuously running burner the entire flame safeguard system would be compromised.