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Cautions regarding UV sources other than flames
The table below shows various radiation sources other than the burner flame that
may activate the flame detector. Make sure that the flame voltage is not affected
under any conditions of the flame response test.
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Safety shutoff test
After all operational adjustments have been completed, carry out the safety shutoff
test.
• Pilot ignition failure (ignition failure)
(1) Close the manual fuel valves to the pilot and main burners.
(2) Press the ignition switch to begin combustion.
(3) The pilot valve opens for pilot burner ignition, but ignition is not possible.
Check that the FLAME LED does not light up, and the main valve does not
open.
Do not hold the ignition switch for a long time.
• Flame failure during normal combustion
(1) Open the pilot and main manual fuel valves.
(2) Press the ignition switch to start operation.
(3) When the sequence has progressed correctly and normal combustion (main
valve open) has begun, close the pilot and main manual fuel valves to put
out the burner flame. Then, check that the flame failure is detected and that
safety shutoff occurs correctly.
Chapter 3. ADJUSTMENTS FOR TRIAL OPERATION
Ultraviolet ray sources
Red-hot chamber wall with temperature 1371 °C or more
Sparks
• Ignition transformer • Welding arc • Lightning
Gas laser
Sunlamp
Germicidal lamp
Strong flashlight (toward UV sensor)
Gamma ray and X-ray sources
Regression analyzer
Electron microscope
X-ray camera
High-voltage vacuum switch
High-voltage capacitor
Radioactive isotope
Other sources producing ultraviolet rays, gamma rays and X-rays
