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1. What flow meter can measure the flow rate of incomplete pipes?
Electromagnetic flowmeter, ultrasonic flowmeter, and open channel flowmeter are common choices in the scenario of measuring the flow rate of the pipeline.
. 1. The electromagnetic flowmeter is designed based on the principle of electromagnetic induction, and calculates the flow rate by measuring the induced electromotive force generated by a conductive liquid in a magnetic field. Advantages: Strong adaptability to conductive liquids, unaffected by factors such as fluid density and temperature, and high measurement accuracy. Applicable scenarios: Non full tube measurement of conductive liquids such as sewage treatment, chemical acid and alkali media, etc.2. Ultrasonic flowmeter adopts the principle of time difference of ultrasonic co current/counter current propagation, and non-contact measurement of flow velocity. Advantages: Flexible installation, minimal pressure loss, suitable for irregular pipeline laying environments. Applicable scenarios: Large diameter water supply pipelines, circulating water systems, and other situations where fluid does not need to be cut off. 3. Open channel flow meters measure flow by linking liquid level height with channel geometric parameters and require a matching weir structure. Advantages: Suitable for rectangular/trapezoidal/circular open channels, with low maintenance costs. Applicable scenarios: open channel flow monitoring for agricultural irrigation, municipal drainage, etc.
2. Qingtian Instrument teaches you how to solve the problem of measuring media that cannot reach the non full tube electromagnetic flowmeter?
Qingtian Instrument teaches you how to solve the problem of e
1. Understand the impact of non full pipe conditions. Non full pipe conditions can be understood as extreme situations where the measured liquid medium contains a large number of bubbles. There are two situations where the pipeline is not filled with liquid: when the liquid level is above the electrode level and when the liquid level is below the electrode level. Although the measurement data of the former may be relatively stable, there is a significant measurement error due to the inclusion of gas volume inside the pipeline; The latter will cause the electrodes to be exposed in the air, and the measurement circuit will be in a clear signal circuit state, making the electrodes unable to function properly.
2. Method for determining non full tube state Bubble discrimination method: Use a pointer multimeter to measure the electrode resistance. If the electrode circuit resistance significantly increases, it can be determined as an abnormality in the electrode circuit, and then it can be judged that there may be an empty tube situation.
. The specific operation is to measure with a domestic multimeter multiplied by a range of 1k. If the measured resistance value is greater than 100 kiloohms, it can be determined that the e
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