Sensitivity Adjustment - BFI Automation CFC 200 Technical Description

Sensitivity Adjustment

By using a potentiometer which is located on the back side of the compact flame controller beneath a
screw it is easily possible to adapt the controller to various firing conditions.
Turning the potentiometer counter clockwise will reduce the sensitivity. Please note that a reduction of
the sensitivity might also cause a reduction of the current output for the intensity.
Output current selection
Assembly
The correct positioning of the sight tube to the flame with less vibration is an important requirement for
an optimised flame control. The assembly must ensure the primary combustion zone is inside the visi-
ble angle of the flame monitoring device for all loads. This is the only way for discriminating flame con-
trol. The extension of the sight axis may not cross the first third of other flames.
Length and diameter of the sight tube are directly related to the available flame radiation, because the
visibility angle of the device is defined. The maximum length 'L' of a sight tube is related to the tube's
diameter 'd'.
d 1" 1,5"
L 0,5m 0,8m
The tube should be as short as possible. A diameter of 2 inch is recommended.
The right adjustment is shown in the following drawing. The optical adjustment device BFI 235 is
available ex stock (part-no.: P 106)
The compact flame controller is delivered with a flange for quick assembly. The device is equipped
with a supply for purge air which prevents the lens of contamination with dust and a subsequent dam-
age. The optimised assembly kit consists of heating insulator, blocking valve and ball flange.
These mechanical devices are also available on demand.
0-20 mA
2"
1,1m
4-20mA
Jumper
3