Low Tension Gas / Electric Ignition with Flame Surveillance
Ignition Control System
The Igniter control system has been designed to offer maximum reliability and flexibility. The Igniter uses only on low tension cable to transmit the spark and also to receive the flame on signal, giving maximum with less congestion of the equipment.
The Igniter control system is designed to be used in conjunction with a single electrode gas-air mix Igniter rod. The Igniter Coil is mounted at the rear end of the Igniter Rod, and connections are via a 3 way plug and socket. The Igniter coil is fed from a pulsed generator which is switched by a Thyristor. This pulsed supply (140V Half Wave) is applied to the low tension winding of the coil, which in turn, generates the high tension spark.
Duties:Signals required from management
During the Spark On period, the ionisation detector rejects any signals from the spark generated, this being taken care of by a capacitor network, thus flame present detection can only take place after the spark is switched off and a flame on signal from the electrode is detected.
The Flame On signal is achieved by ionisation. When a gas flame is established, this permits the flow of positive ions between the electrode (Anode) and the Igniter body (Cathode). This gives a variable forward resistance. The Igniter Control System has a set resistance threshold and when this is reached; the relay in the control system is energised, indicated by orange Led Flame On. This change is displayed on a 0-10V analogue signal strength meter, which is incorporated into the unit to indicate when the gas air mix is correct.
