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Chapter 2. MOUNTING
Handling Precautions
•
Mount this device so that it monitors the burner at an angle from
above. If it monitors the burner at an angle from below or from
the same level, dust, soot, etc., will accumulate on the monitoring
window or in the monitoring pipe. This may block the ultraviolet
rays, preventing flame detection.
•
Mount this device so that its monitoring orientation intersects
the flame axis at as small an angle as possible. This maximizes the
overlap between the flame and the area monitored by the device.
Thus, the amount of detected ultraviolet rays also increases.
Flame surface area monitored is small.
Unburnt fuel
Flame surface area monitored is large and much ultraviolet radiation is detected.
Burner
Good sighting position
(low angle sighting)
Poor sighting position
zTemporary welding for monitoring pipe positioning
(1) Preparing a monitoring pipe and making the mounting hole
Make the mounting hole at the selected location for the monitor-
ing pipe. Cut threads on one end of the monitoring pipe and cut
it to the desired length, making it as short as possible.
(2) Welding the monitoring pipe temporarily
Weld the monitoring pipe temporarily to the plate of the com-
bustion chamber of the boiler, etc. Do not weld the monitoring
pipe completely at this time, because inspection and adjustment
are required for successful flame detection.
Monitoring pipe
Temporary welds
Furnace wall (refractories) Plate
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