Optical Flame Detectors Flashcards
What part of the flame should the sighting be most concentrated on when sighting an ultraviolet flame detector?
The first third
What part of the flame should the sighting be most concentrated on when sighting an infrared flame detector?
The last third
What part of the flame is visible light most concentrated in?
The middle
Referring to the Figure below, what UV flame scanner position would be the most ideal?
UV scanner #2
Which flame detector is not compatible for supervising oil burners?
Flame rod
Which flame detector is not compatible for supervising natural gas burners?
Photo cell
Which type of flame detector is not light responsive?
Flame rod
Which type of flame detector can be affected by refractory glow?
Infrared
Which type of flame detector can be affected by UV radiation from the ignition spark?
Ultraviolet
What type of test should be performed to ensure the optic flame detector cannot detect ignition spark?
Spark rejection test
What three things can be done to restrict the field of view for an optical flame sensor?
- Adding an orifice to the sighting pipe
- Lengthening the sighting pipe
- Decreasing the diameter of the sighting pipe
Why do UV optical flame sensors use quartz glass to contain the gas and electrodes?
It does not block UV light
When is a self-checking type flame detector required?
When the burner firing cycle can last longer than 24 hours without cycling
