IFC 110 F V2.0 IFC 110 F-EEx V2.0 - Krohne

Sect. 6.10 Part C Special applications, functional checks, service, and order numbers6.10 Stable signal outputs with empty measuring tubeImportant, please note!• Observe the directions and regulations and the electrical data specified in theEC type test certificate.• In addition to the regulations for heavy-current installations (VDE 0100),pay particular attention to the requirements specified in EN 60079-14 “Electricalequipment in hazardous areas”.• Assembly, installation, commissioning and maintenance work may only be carriedout by “personnel trained in explosion protection”!Output signals can be stabilized to values as for ”zero” flow to prevent undefined output signalswhen the measuring tube is empty.– Display 0– Current output 0 or 4 mA, see setting in Fct. 1.05– Pulse output P no pulses (= 0 Hz), see setting in Fct. 1.06– 2nd pulse output A1 no pulses (= 0 Hz), see setting in Fct. 1.07Prerequisite: • electrical conductivity of process liquid ≥ 200 mS/cm,≥ 500 mS/cm for sizes DN 2.5 - 15 and 1 / 10 ” - 1 / 2 ”.• Signal cable length ≤ 20 / ≤ 65 ft and vibration free with signalconverter.LA / S2 Empty Tube stabilizationsteady display at “0“ flowLA / S2 should be used when problems areencountered with EPD or the limits of theapplication are exceeded.At “0“ flow, the electrodes are connected to 0 V(chassis) via high-resistance resistors.LA / S4 electrode cleaningand Empty Tube stabilizationLA / S4 prevents any deposits of highresistancelayers on the electrodes (e.g. fatfrom very creamy milk) and effects stabilizationsimilar to the LA / S2.For this purpose, the electrodes are connectedto –12 V via high-resistance resistors.0 V - 12 V - 12 VTo join the “semicircles“ of the three solderingpoints S1, S2 and S4, see under ”Point 8“.Possibly reset low-flow cutoff (SMU),see under Point 11To join the “semicircles“ of the three solderingpoints S1, S3 and S4, see under ”Point 8“.Possibly reset low-flow cutoff (SMU),see under Point 11Please note!Only use the two functions, if Empty Pipe Detection (EPD) is switched off, see Sect. 6.9 and inFct. 3.06 Application → EMPTY PIPE.66 IFC 110 F 05/2003