An incorrectly sized mixer or a simple tee arrangement can not only restrict adjustment but more importantly can cause unsafe conditions to occur. The common principle with all these burner ends is the requirement for flame retention. Full automatic ignition and flame safety is frequently fitted to automate the process and provide quick lockout on flame out or process stop. The safety module controls solenoid valves fitted to the gas train and high temperature ignition and sensing probes mounted to the tip supply the high tension spark and complete the flame sensing rectification circuit. We can also provide flame out alarms if preferred.
More technical information is available on any of the above concepts.
It is imperative these are correctly sized relative to the burner port area and mixture pressure. Hoses must be used that have minimal pressure drop and there must not be valving in the mixture line from the mixer to the burner tip. Inadequate turn down and lightback are the most common. This will be apparent as an inability to control from a high to a low flame on ratio and is usually caused by lack of adequate negative pressure on the gas inlet to the mixer. A pressure check should be performed on the air line just prior to the air orifice with the burner or air rate on maximum.