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What are the precautions for using a vortex flowmeter?
There must be sufficient straight pipe sections upstream and downstream. In theory, if there are two 90 ° elbows upstream of the sensor installation point on the same plane, the upstream straight pipe section should be ≥ 25D, and the downstream straight pipe section should be ≥ 5D; if there are two 90 ° elbows upstream of the sensor installation point of the vortex flowmeter on different planes, the upstream straight pipe section should be ≥ 40D, and the downstream straight pipe section should be ≥ 5D; in addition, the regulating valve should be installed outside the downstream 5D of the flow sensor. If it must be installed upstream of the sensor, the upstream straight pipe section of the sensor should be no less than 50D, and the downstream should be no less than 5D. For split vortex flowmeters, the selection of pressure measuring points and temperature measuring points should be based on measurement needs. The pressure measuring point should be at 3-5D downstream of the sensor, and the temperature measuring point should be at 3-5D downstream of the sensor. Downstream 6-8D. We generally recommend customers to use an integrated vortex flowmeter with temperature voltage code compensation function. This intelligent flowmeter integrates temperature sensors, pressure sensors, and flow sensors, which can improve the measurement accuracy of the flowmeter itself and synchronously display the temperature and pressure values of the medium in the pipeline on the LCD head of the instrument itself. More importantly, it avoids the construction trouble of setting up additional temperature and pressure measurement points.
2. How to use vortex flowmeter correctly_600x400.jpg)
Vortex flowmeter, also known as Karman vortex flowmeter.
. It is a separated flowmeter made using the principle of natural fluid oscillation. When a fluid flows through an object perpendicular to its flow direction at a sufficiently high velocity, if the size of the object is appropriate, a neatly arranged and opposite turning vortex column will be generated behind the object along two parallel straight lines. Among them, S is the Strouhal number, V is the average flow velocity inside the pipeline, and d is the width of the upstream face of the cylindrical body. Therefore, by measuring the frequency of the vortex, the flow velocity of the fluid can be determined, and the flow rate of the fluid can be measured. Precautions for sensor installation(1) The sensor should be installed horizontally or vertically (the flow direction of the fluid should be from bottom to top) on the pipeline corresponding to the nominal diameter.
(2) When using a vortex flowmeter for flow regulation, special attention should be paid to installing the flow regulating valve behind the sensor, otherwise it is easy to generate jets at low flow rates, resulting in a fault phenomenon where the medium flow rate is inversely proportional to the valve opening during flow regulation.
(3) When installing the flowmeter, a certain length of straight pipe section should be configured for the upstream and downstream virtual stools.
(4) Flow meters should not be installed on pipelines with strong vibrations to avoid affecting measurement accuracy. Precautions for use
(1) In the water supply system, flow meters are generally installed in the instrument well. To prevent damage to the instrument due to water entering the
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