74
10 Appendix
10.2.3 Optical Flame Sensors
10.2.3.1 Switching to Display the Flame Intensity
FFS07, FFS05 (is replaced by FFS07) and subtypes.
The sensor's circuit components are located on printed circuit board (PCBs) in a cylindrical
housing with a spray-proof, axial optical aperture.
The sensor meets the requirements of protection class IP 65.
Optical flame sensor FFS08, FFS06 (is replaced by FFS08) and subtypes (standard sensor
for ETAMATIC OEM)
The sensor's circuit components are located on printed circuit boards (PCBs) in a cylindrical
housing with a spray-proof, lateral optical aperture. The sensor meets the requirements of pro-
tection class IP 65.
The computing circuit for all sensor types is located in the ETAMATIC OEM.
Cabling from the sensor to the ETAMATIC OEM is 5-pole, static-screened with the sensor
housing's potential (operating earth connection), a six
th
cable is for measuring the flame signal
during commissioning.
WARNING!
If the ETAMATIC OEM is used with an integral flame monitor, terminal 53 may not be connect-
ed to any other components
The optical flame sensors are supplied together with a connecting cable of ca. 2 m length. The
line between the sensor and the flame monitoring unit may be extended up to a distance of
500 m. For implementing an on-site extension we recommend a separate screened, five-wire
extension cable that can be connected to the sensor cable via an FG 24 (with ex-applications)
or FG 21 connector box, e.g.
WARNING!
If the option "integral flame monitoring" is deactivated subsequently in the ETAMATIC OEM
(e.g. an external flame monitoring should be used), up to base version 4.0 the automatic flame
guard plug-in card has to be removed from the ETAMATIC OEM, from base version 5.0 on the
bridge 450 (beside the 96-pole plug) has to be switched.
The cable's screening may not be used as a low-frequency carrying operational link. The sen-
sors should be so mounted at the inspection aperture, that the burner's flame is properly vis-
ible across the entire combustion facility's "operating range”. For selective monitoring, the
inspection aperture should be so placed that the sensor covers the monitored flame's root
(near the burner's mouth). Attention should be paid to the fact that with extended tube collars
the part of the flame, which is covered by the sensor, becomes restricted. If necessary, the
inspection aperture should be sealed with a suitable protective glass sheet.
cable type: LiYCY (blue, red, green, yellow, white) 5 x 1 x 0.5 mm
2
(AWG 20)
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