Electromagnetic flow meter scale atc detection and alarm

Abstract: the electromagnetic flow meter scale atc detection and alarm information produced by excellent flow meter, flow meter manufacturer to offer you the quotation. When talking about the principle of electromagnetic flowmeter, once referred to a measuring condition that needs to be conductive liquid fills the measuring tube, this is because the disgruntled pipe area is uncertain, can't get the correct flow through the measuring tube actually, but also may bring all kinds of interference. More flow meter manufacturers choose model price quote you are welcome to inquire, here is the electromagnetic flowmeter scale traffic detection and alarm the article details. When talking about the principle of electromagnetic flowmeter, once referred to a measuring condition that needs to be conductive liquid fills the measuring tube, this is because the disgruntled pipe area is uncertain, can't get the correct flow through the measuring tube actually, but also may bring all kinds of jamming signal. This false measurement as measurement will cause trade disputes, control of the manufacturing process, will cause to adjust and control error. Therefore, in the intelligent electromagnetic flow converter, often atc detection circuit design, not to alarm sensor pipe full of state. Atc testing method are many, zui simple and reliable detection approaches is to use the liquid level detection method. However, this method need to be at the same time, liquid level sensor is installed on the measuring tube. Therefore, would increase the cost of measuring instrument, installed on the trouble. Generally rarely used, namely using this method, only with a liquid level contact the police. Below in order to adopt the method of measuring liquid conductivity atc testing, to a certain extent can also said the liquid relative electric conductivity. Figure 4 - Is domestic L - 56 Mag atc alarm in type electromagnetic flow converter principle block diagram. E, is to provide the conductance measurement circuit of high frequency ac power supply ( v） ； R is used for measuring the conductivity of partial pressure resistance ( Q） ； Rx is said zui electromagnetic flow sensor electrode (between the fluid and Signal ground) Internal resistance resistance, usually we call signal. The size of the Rx and fluid conductivity d ( Unit is the S/m, S = 1 / n) Relationship is: using the measuring conductivity detection atc, there are two points are worth noting. First of all, should choose the frequency of the ac power is different with the traffic signal frequency, and can't appear additional polarization voltage on the electrode. So you can use the 2000 hz ac power. Secondly, using the electrode to detect atc state, in sequential seven do not conflict with traffic signal sampling sequence. Atc test usually use time is the forefront of the magnetic field waveform is backward, but to enter the flow sampling time. Electromagnetic flowmeter flow signal sampling time is by the waveform after along forward, leaving the integral transition period. The voltage comparing with the smell of value set voltage E is a monostable way of working. Considering the fluid conductivity measurement application range is wide, is the voltage v. The range is wide, monostable dynamic range is too big, can appear alarm is not reliable. So application software set a & other Atc range correction & throughout; Correction factor to adjust the gain of the amplifier, which detects the voltage of the conductivity of different v, after amplified by the amplifier I get close to the voltage of the output amplitude values. This is similar to instrument measuring the range of adjustment. Is inversely proportional with the conductivity, the conductance ratio and conductivity detection is nonlinear relationship. So, & other; Atc range correction & throughout; Correction factor is nonlinear with the conductance of the display. Thus, in different & other; Empty throughout her range correction &; Coefficient, auxiliary out, show that the electrical conductivity of numerical change was widespread phenomenon, and the setting of threshold range may be less than the conductivity than the numerical range of measurement, so it is easy to appear the atc false alarm. （ l） Atc range correction & other; Atc zui throughout Fu correction &; The conductance of the value, the greater the detection showed lower than; “ Atc range correction & throughout; The smaller the value, test shows the conductance ratio is higher. So, to dealer conductivity detection, use small & other Atc range correction & throughout; Value. Of electromagnetic flowmeter is low conductivity detection, the need to use high & other; Atc range correction & throughout; Value to the conductivity is higher than tap water around 50 ys/CRN conductivity, for example, & other; Atc range correction & throughout; Oooo, detection of conductance than universal meet the threshold for 999. 9% of the requirements. For 1 second higher conductivity, can reduce & other; Atc range correction & other; Value or lower the threshold to improve the detection sensitivity and I for fluid conductivity low f50yS/cm, you need to will & other; Atc range correction & throughout; A value is large, for example is set to 3. 0000, at the same time, the threshold is set to 999. 9%. Then reduce the conductance ratio of display, make it less than the threshold, to prevent false alarm with a fluid. （ 2) Figure 4 - 58 data is under the condition of not connect transmission cables.
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