Lamtec ETAMATIC Manual

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Lamtec ETAMATIC Manual Manual pdf 73 page image

729 Appendix9.2.3 Optical flame sensorsSwitching to Display the Flame IntensityFFS 05, FFS 05 UV, FFS 06, FFS 06 UV (with following sub-types; FFS05, FFS05 UV de-signed for ex-zone 1 or ex-zone 2 as well)The sensor's circuit components are located on 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 FFS 06/FFS06-UV (standard for ETAMATIC)The sensor's circuit components are located on PCBs in a cylindrical housing with a spray-proof, lateral optical aperture. The sensor meets the requirements of protection class IP 65.The computing circuit for all sensor types is located in the ETAMATIC.Cabling from the sensor to the ETAMATIC is 5-pole, static-screened with the sensor housing'spotential (operating earth connection), a six th cable is for measuring the flame signal duringcommisioning.WARNING!If the ETAMATIC is used with an integral flame monitor, terminal 53 may not be connected toany other componentsOptical flame sensor FFS 05 … ; FFS 06The optical flame sensors are supplied together with a connecting cable of ca. 2 m length. Theline between the sensor and the flame monitoring unit may be extended up to a distance of500 m. For implementing an on-site extension we recommend a separate screened, five-wireextension 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 (e.g. anexternal flame monitoring should be used), up to base version 4.0 the automatic flame guardplug-in card has to be removed from the ETAMATIC, 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, theinspection 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 collarsthe part of the flame, which is covered by the sensor, becomes restricted. If necessary, theinspection aperture should be sealed with a suitable protective glass sheet.9.3 Avoiding EMC EffectsThe proper installation normally prevents from the EMC-adverse effects. In exceptional casesit may be necessary by not traceable and /or not removable sources of interference to find anadequate grounding point for the shielding.1 In exceptional cases it is possible, that through the protected earth an interference level isinjected into the shielding. Unmotivated fault shut-downs (especially with low wanted sig-cable type: LiYCY (blue, red, green, yellow, white) 5 x 1 x 0.5 mm2 (AWG 20)