How to deal with the impact of interference on meter scale

Abstract: how to deal with the effects of interference on meter scale information produced by excellent flow meter, flow meter manufacturer to offer you the quotation. In numerous traffic detection solution, the vortex street flowmeter due to their high measurement precision, small pressure loss, easy installation, not affected by the physical properties of measured medium, signal facilitate remote transmission characteristics, application technology improvement, especially in the big diameter and water. More flow meter manufacturers choose model price quote you are welcome to inquire, here's how to deal with the effects of interference on meter scale article details. In numerous traffic detection solution, the vortex street flowmeter due to their high measurement precision, small pressure loss, easy installation, not affected by the physical properties of measured medium, signal facilitate remote transmission characteristics, application technology improvement, especially in the big diameter and the flow of water, oil and other liquid medium measurement used more widely. Vortex flowmeter is made on the basis of the principle of fluid dynamics of the karman vortex street. In a certain range of Reynolds number, fluid velocity or volume flow and vortex frequency is proportional to the physical properties of the fluid ( Pressure, temperature, density, etc. ) Has nothing to do, i. e. , Q = k f type: Q is a volume flow; K is constant instrument; F vortex frequency. According to the principle of the measurement, a characteristics of vortex flowmeter is vulnerable to electromagnetic interference and mechanical vibration, the resulting restrictions on several occasions that the normal use of vortex flowmeters, this also is the working conditions of vortex flowmeter. Solve the problem of anti-jamming is extended range lower limit, an effective way to improve vortex flowmeter. 2 working conditions of bluff body vortex flowmeter with piezoelectric crystals to detect vortex frequency, piezoelectric signal amplified by communication and trigger, the vortex frequency into pulse signals. Pulse signal to secondary instrument after conversion according to the measured flow. Among them, the ac amplifier amplification factor K and the trigger threshold voltage can be adjusted, as shown in figure 1. In figure 1 for E, interference signal voltage signal is converted to the input V, threshold voltage U convert to input for U, ac magnification for K. Because u = the UK, the adjusting effect of K or u are the same. In order to make the threshold voltage can prevent interference signals in order to make sure the output can effectively, must make jamming signal V is less than the threshold voltage u, E is greater than the threshold voltage and effective signal voltage u, that is, the working conditions of vortex flowmeter is: E & gt; u > V the size of the jamming signal V decide vortex flowmeter range limit. So extend the range of vortex flowmeter are lower limit must start from reducing interference signal. Adjust the magnification factor K of the output signal only strengthen communication, and the range limit and cannot be extended. 3 anti-interference measures the jamming signal of vortex flowmeter are mainly two kinds of electromagnetic interference and mechanical vibration interference, how to solve these two kinds of anti-interference problem becomes the key to improve the vortex street flowmeter. Vortex flowmeter is usually adopts metal case, shell shielding effect can prevent electric field and radio frequency interference; For the interference of magnetic field, can be in the internal circuit design through the reasonable selection of magnetic components, printed circuit board wiring solution, with the development of electronic technology and the improvement of the manufacturing process is not a problem. So the resistance to electromagnetic interference are mainly ground current interference. Vortex street flowmeter of piezoelectric crystal is installed on the bluff body structure, one end of the piezoelectric crystal shell, so the signal preamplifier grounding inevitably. The output signal of vortex flowmeter to secondary instrument, the dc power required to signal amplification and provided by the secondary instrument. Piezoelectric crystals between the ground and secondary instrument of ground form current step is likely to exist. The current flow in the ground of amplifier will have the pressure drop, the pressure drop and the effective signal superposition together, not separation, is the interference of ground current. Vortex street flowmeter interference of ground current solution is to reduce or eliminate the ground current, zui radical idea is to turn the secondary instrument to dc power supply isolation. The dc power supply after isolation transformer rectifier again into the dc supply of vortex flowmeters, make secondary instrument ground with no electrical connection between the ground plane piezoelectric crystal. At the same time effective measure after preamplifier signal into pulse signal, the pulse transformer output to the secondary instrument, fundamentally eliminate the influence of ground current, is an extremely effective anti-interference measures. Transformer isolation method costs are relatively high, however, big volume, manufacturing process is not easy to implement, greatly reduces the practicality. Optical isolation current-limiting anti-interference measures, can effectively reduce the interference of ground current. The principle is shown in figure 2. Figure, a is the ground of a piezoelectric crystal, b is secondary instrument of the ground. Access in the ground loop resistance r, so the ground current between two points a and b are limited by resistance r, the voltage drop between two points a and b on both ends of the resistance r.

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