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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.
Mounting of the monitoring pipe
zMonitoring pipe materials
Use a mounting pipe with a black inside wall. If the inside wall of the
pipe has a stainless steel or electroplated surface, ultraviolet rays will
be reflected irregularly inside the pipe, causing a malfunction.
zMonitoring pipe size
To detect a large amount of ultraviolet radiation from the flame, this
device’s light-receiving surface must have a wide field of view. If the
recommended flame voltage of 2.0VDC or more cannot be ensured,
change the monitoring pipe to a wider one so that sufficient ultravio-
let radiation is received.
• Use as large a monitoring pipe as possible. Connect the pipe to the
device using a reducer.
• Make the length of the monitoring pipe as short as possible.
However, always keep the operating ambient temperature within
100°C (up to 120°C during flame detection).
zMounting space
Leave a sufficient space for easy maintenance, inspection, and service
work.
Reducing socket
Connection
nipple (1")
Weld this
part
Burner
Plate
Tapered monitoring hole
Furnace wall
Air
*
Tees
Monitoring pipe, 1" or more (Use 2" to 3" pipe.)
* If the air purging is needed, tees are
used to supply the air.
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