9
3
Functional Description
3
Functional Description
3.1
Design
The compact-type flame detector is composed of a cylindrical casing comprising an axial light
incidence aperture, a processing status indicator at the rear of the unit and operational con-
trols which can be accessed by removing the cover.
When closed the flame detector complies with the requirements of IP 67 (F200K) or IP66
(F200K..EX) protection degree.
The detector is installed at the burner by optionally using the FH30, FV30, FH40, FV40 adjust-
able holding devices or with an air-cooled housing of types FS50, FS51 or FS56.
The detector consists of the following functional units:
–
sensor unit providing for digitalisation of the flame signal
–
digital frequency evaluation
–
self-monitoring
–
switching amplifier
The device is connected through an integrated standard plug and using the a connection cable
required for this (8 pins, static shielded) with coupler.
The cable provides for the following connections:
–
Infeed of power supply
–
connection of the operational earthing FPE
–
connection of external power circuits to a failsafe change-over contact to control the con-
trol states ’Flame out’ and ’Flame in’
–
connection of the intensity measurement output
–
connection for an external sensitivity change-over, only for F200K2
–
connection of the screen via the connector housing
The layout of the operational controls is represented in chapter
