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C7015A
INSTALLATION
INSTALLING AN ORIFICE PLATE
AnorificeplatewithahexagonalorificediameterofO.125
in.
[3.2
mm] is available for the
C7915A
Infrared Flame
Detector.
The
orifice can be mounted in front
of
the cell in the
seal-off
adapter
or in a standard
314
in. coupling. (Refer to Fig.
1.)
The size of the sighted area at various distances can be
determined
from
Table 4 or 5. For example, if the distance
fromthephotocelltoa0.125
in.
L3.175
mm] diameterorifice
is4in.
[101.6mm],andfromtheorificetotheflamejunction
(or refractory) is 36 in.
[914.4
mm], the dieter of the
sighted area is 2.4 in.
[70
mm].
Fig. 3 shows how a typical orifice plate restricts the view
of a small area around the flame junction.
TABLE
ADIAMEXER
OF AREA SIGHTED THROUGH ORIFICE, IN IN.
6
-
1.1
1.6
I
2.1
2.6
3.2
TABLE
5-DIAMETER OF AREA SIGHTED THROUGH ORIFICE, IN MM
Fig.
3-4sing
orifice plate to restrict detector field of view to intersection of pilot and main flame, or to
sniall
area
of
hot refrktory.
WlTHOUT ORIFICE PLATE WITH OFilflCE PLATE
PILOT
\
HOT REFRACTORY
\
MAIN FLAME
\
PILOT,
HOT REFRACTORY\
MAIN
FLAME\
6