High energy ignitor

November 2012 Operator Interfaces, Switches & Relays

The Durag D-HG 400 high energy spark ignitor can ignite oil and gas burners of any capacity. In its standard version, the ignition lance and the control unit form a compact module. Depending on the ignition device, ignition can be triggered either through a pushbutton or by feeding the supply voltage automatically.

After fuel ignition the ignitor tip should be retracted from the flame area as a protection against heat overload and then switched off. This can be done manually or automatically. In the latter case this is by way of a Durag D-VE 500 pneumatic retraction unit. With special burner types such as torch systems, no retraction is required if the flame wanders so far off that the thermal load stays within the permissible working temperature. The length of the ignition lance is manufactured to suit the furnace plant’s requirements.

Inside the ignition unit, the energy equivalent of 4,5 W is loaded into a high voltage capacitor. With the help of a robust switching element, this energy is released to the ignition tip where it is converted to heat through an arc discharge. It is this arc discharge that ignites the fuel.

To ensure ignition in the start-up phase, the unit generates 20 ignition sparks during the first 60 seconds and then reduces to 5 ignition sparks/second. When the ignition device is switched to the supply voltage, the ignition function message is issued via the built-in LED and through the ignition signal relay’s output contact. The Durag High Energy Spark Ignitor is also available in an explosion-proof version with separate ignition lance.

For more information contact Mike Andrews, OEN Enterprises, +27 (0)11 675 4447, [email protected], www.oenenterprises.co.za

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