The allowable range of the mounting posture is that the upper limit is 90° (conduit
tube port becomes horizontal) and the lower limit is 45°.
Vertical
plane
Upper limit 90°
Lower limit 45°
Horizontal
plane
Side
90°
45°
Handling Precautions
Mount this unit at an appropriate angle so that it monitors the burner •
from the upper slanted position. If this unit is mounted so that it moni-
tors the burner from the lower slanted position or horizontal position,
dust or soot may accumulate on the monitoring window or in the moni-
toring pipe. This may block the ultraviolet rays, causing the flame not to
be detected.
Mounting of monitoring pipe n
Materials of monitoring pipe ●
Use a monitoring pipe with a black inside wall. If a pipe with the stainless steel or
galvanized inside wall is used, diffused reflection of the ultraviolet rays occurs in-
side the pipe, causing a malfunction.
Size of monitoring pipe ●
To detect the ultraviolet rays radiation of the flame at its optimal level, it is neces-
sary to widen the light receiving area of this unit. If a recommended flame voltage
of 2.0 V or more cannot be kept, make the monitoring pipe thicker to receive a suf-
ficient amount of ultraviolet rays.
• Use the monitoring pipe as thick as possible and connect the pipe to this unit
with the reducing socket.
• 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).
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