Clean the right essentials of anticorrosion electrode electromagnetic flowmeter and related five detection

by:Kaidi Sensors     2020-08-20
Electromagnetic flowmeter, as a kind of intelligent precision pipe flow measurement instrument, what with other types of flow meter does not have many advantages, such as from the fluid density, viscosity, temperature, pressure and the influence of the conductivity changes; Measuring pipe unimpeded flow components, no pressure loss, straight pipe requirements is low; Sensor lining and electrode materials have a variety of choice; Converter adopts novel excitation method, low power consumption, zero point stability, high precision. Therefore has been widely used in industrial production, at the same time for a variety of different media and different measurement conditions, the electromagnetic flowmeter types to adapt to the different media and different environment, such as the battery model, anti-corrosion type, diving type electromagnetic flowmeter. Anticorrosive if electromagnetic flowmeter measurement of medium to long-term is dirty, so electromagnetic flowmeter in work after period of time, electrode nine will produce scale. When scaling material conductivity and electrical conductivity of the measured medium is not at the same time, there would be a measurement error. Sludge, oil pollution of electrode, also can make the instrument output swing and drift. Therefore, in this case we need regular electrode electromagnetic flowmeter for maintenance and cleaning. 1, to the inorganic pollution, electrode can be immersed in 0. 1 mol/L 30 minutes in dilute hydrochloric acid, clean with water, then immersed in 3. 5 mol/L potassium chloride solution soak for use after 6 hours. 2, 4% hydrogen fluoride solution at 3 ~ 5 s, extracted with distilled water rinse, then at 0. 1 mol/L in hydrochloric acid solution soak for several hours, with distilled water is rinsed clean, calibration. 3, serious pollution formation on the surface of platinum oxide film, can use toothpaste for platinum or gold surface polishing, and then clean with water, then immersed in 3. 5 mol/L potassium chloride solution soak for use after 6 hours. 4, to the organic pollution and pollution of oil film, can use detergent to clean platinum or gold surface with water after cleaning, then immersed in 3. 5 mol/L potassium chloride solution soak for use after 6 hours. Five anticorrosive electromagnetic flowmeter test 1. Electrode contact resistance. Measuring contact resistance, electrode spoon liquid can be not discharged from the pipe flow sensor and indirect assessment of electrode and lining layer surface conditions generally, help to analysis the cause of the problem. 2. The electrode polarization voltage. Measuring electrode polarization voltage between the liquid and will help to judge whether the fault of the unstable zero or output shaking caused by electrode is covered by pollution or. With 2 v dc digital multimeter, respectively measure the polarization between the two electrodes and ground voltage ( Electromagnetic flowmeter can not power, power measurement) 。 If two measured values close to nearly equal, electrode not contaminated or overwritten. Polarization voltage size depends on the electrode materials & other; Electrode potential & throughout; And the properties of the liquid measurements may be between a few mV to a few hundred mV. Because, in fact, in the operation of the two electrodes contamination situation can't be exactly the same symmetry, then the voltage on the electrode formed asymmetric common-mode voltage. Asymmetry of the common-mode voltage becomes differential mode signal, zero offset. 3. Pipeline stray current flow. Sometimes looking for pipeline stray interference sources in the flow sensor of the upstream or downstream, in order to narrow your search, try to reduce or eliminate stray current interference effects. 4. Determination of the interference signal cable. Signal cable from electrostatic induction and electromagnetic induction interference can make the electromagnetic flowmeter zero change. To determine whether changes in zero due to the effect of electric potential signal cable interference, to determine the influence degree of the interference range and the electromagnetic flowmeter. 5. To determine whether the ground potential. Electromagnetic flow juice during normal use, such as sensors, near motor ( Force) State changes ( Such as leakage) , grounding potential changes caused by zero change. Check whether have the influence, the converter can be work terminal short circuit, grounding C terminal and protection of G to zero ( Or instruction value) Changes in judgment for ground potential. ( In this paper, published by the embellish of instrument science and technology co. , LTD. )
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