BFI Automation CFC 3000L Original Operating Instructions page 30

Transport, Installation and Connection
Recommendation:
For adjustment, use the optical adjustment aid (available
as an option) as shown in the figure below. The best set-
ting is obtained when a large visual field is achieved.
correct
Risk of damage to the eyes from infrared and ultraviolet
radiation and from escaping gases during visual flame
monitoring!
Wear filtering protective goggles !
The images appear mirror inverted in
horizontal and vertical direction !
The length and the diameter of the sighting tube have a
direct influence on the analysable flame radiation as the
visual angle of the lens system is defined. Without re-
striction of the visual range, the maximum length L of a
sighting tube for conventional tube diameters D is as fol-
lows:
D:
L:
For this reason, the sighting tube should always be as
short as possible. A diameter of 2" is recommended.
At a diameter of 1", the sighting tube should not be any
longer than 50 cm. When doubling the length, double
the diameter to 2" !
4-6
incorrect
1" 1.5"
0.5 m 0.8 m
2"
1.1 m