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Contacts which open and close within a distributor, sending an electrical impulse for a spark from the high-tension ignition coil of an engine.

Related Terms

SECONDARY COMBUSTION

Combustion which occurs as a result of ignition at a point beyond the furnace.

FLAREBACK

A burst of flame from a furnace in a direction opposed to the normal flow, usually caused by the ignition of an accumulation of combustible gases.

FLAME PROPAGATION RATE

Speed of travel of ignition through a combustible mixture.

IGNITION TEMPERATURE

the temperature required to initiate combustion.

FLAME DETECTOR

A device which indicates if fuel, such as liquid, gaseous, or pulverized, is burning or if ignition has been lost. The indication may be transmitted to a signal or to a control system.

INTERMITTENT IGNITION

An igniter which burns during light off and while the main burner is firing and which is shut off with the main burner.

IGNITER BURNER

A burner smaller than the main burner, which is ignited by a spark or other independent and stable ignition source and which provides proven ignition energy required to immediately light off the main burner.

PURGE INTERLOCK

A device so arranged that an air flow to the furnace above a minimum must exist for a definite time interval before the interlocking system will permit an automatic ignition torch to be placed in operation.

LIFT-OFF

This condition occurs when the fuel or fuel/air mixture velocity is too high, thus allowing the fuel to exit the stabilizing zone before it has achieved its ignition temperature.

TRAIL FOR PILOT IGNITION

A timed interval when the pilot valve is held open and an attempt made to ignite and prove it. If the presence of the pilot is proved at the termination of the interval, the main valve is energized; if not the pilot and ignition are cut off followed by a safety lockout.
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