电磁流计

1. Profile KFL-DC series electromagnetic flow meter follow the Faraday law of electromagnetic induction. They can be used to accurately measure the flow rate of liquids which are electrical conducting, caustic, and mixed with liquids and solids. They are widely used throughout industries of petroleum, chemical engineering, pharmacology, papermaking, electric power, environmental protection and so forth. Features No Moving Parts, Virtually No Pressure Loss; Corrosion protection, abrasion resistant; High accuracy, Stable performance; High level of anti-vibration and anti-jamming, wide measuring dimensions. Multi-Output Interface4 20mA, Pulse, Alarm Outputs, RS-485 and Modbus Communication.2. Structure and Operation Principle 2.1. Structure KFL-DC series electromagnetic flowmeters are made up of sensor and transducer, together with LCD screen, current and pulse output, alarm signal and RS-485 communication. 2.2 Operating Principle Faradays Laws of Induction form the basis for the electromagnetic flowmeters. It states that a voltage is induced in a conductor as it moves through a magnetic field. This principle is applied to a conductive fluid which flows through a magnetic field generated perpendicular to the flow direction (see Schematic). The voltage induced in the fluid is measured at two electrodes, installed diametrically opposed. This signal voltage UE is proportional to the magnetic induction B, the electrode spacing D and the average flow velocity v. Noting that the magnetic induction B and the electrode spacing D are constants, a proportionality exists between the signal voltage UE and the average flow velocity v. The equation for the volume flow shows that the signal voltage UE is linear and proportional to the volume flowrate. The induced signal voltage is processed in the converter into scaled, analog and digital signals. 3. Specifications Nominal Meter Size 10 to 1000mm (3/8 to 40 inch) Liquid Pressure (MPa) 1.0, 1.6, 2.5, 4.0, 16, 25 Accuracy ±0.5%, ±1% (upon req.) Minimum Conductivity 5μs/cm Electrode Material SST 316L (standard), Hastelloy, Tantalun, titanium, Tungsten Carbide (upon req.) Fluid Temperature -25 to 65 (-13 to 149) -25 to 140(-13 to 284)(opt.) Liner CR, PTFE, PFA Relative Humidity ≤85% Ambient Temperature -30 to 60 (-22 to 140) Current Output 0 to 10mA or 4 to 20mA Frequency Output 0 to 5000Hz with photoelectric isolation Pulse Output Adjustable from 0.001 to 1000 Ltr/Pulse Alarm Output Upper Alarm-ALMH, Lower Alarm-ALML with photoelectric isolation Upper Alarm-ALMH, Lower Alarm-ALML with photoelectric isolation Communications RS-232 without galvanic isolation RS-485 with galvanic isolation, MODBUS. Supply Power 85 to 250VAC (45 to 63Hz) 16 to 36VDC Power S10W/AC, S7.5W/DC