Solid flow meter | Electromagnetic flow meter: selection of range and flow rate | SILVER,transit time ultrasonic flow meter

Flow Meters – Silver Automation Instruments

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1. Precautions for installation of split type electromagnetic flowmeter

When installing a split type electromagnetic flowmeter, attention should be paid to key points such as vertical installation, prevention of foreign object interference, avoidance of negative pressure, and reserved maintenance space. Specifically, the installation should be perpendicular to the fluid direction sensor, and the fluid direction should flow from bottom to top. This installation method ensures that solid particles (such as sediment and small stones) in the solid-liquid mixture remain suspended, avoiding sedimentation that may block the measuring tube or adhere to the electrode, thereby ensuring measurement accuracy. If the fluid flows horizontally or from top to bottom, solid particles may deposit at the bottom of the measuring tube, causing signal distortion or equipment damage. Preventing foreign objects from interfering with fish and weeds: If there may be fish or weeds in the pipeline, their movement or attachment near the electrode can cause fluctuations in the output signal of the flowmeter (such as back and forth oscillation of the output value). A metal filter screen needs to be installed at the upstream inlet of the flowmeter to intercept foreign objects entering the measuring tube. Solid particles: For media containing solid particles, vertical installation can reduce the risk of sedimentation, but it is still necessary to regularly check the filter screen and the inner wall of the measuring tube to avoid particle accumulation affecting the measurement. Avoiding the risk of negative pressure: If the upstream and downstream valves of the flowmeter are closed at the same time, and the fluid temperature is higher than the

ambient temperature, the contraction of the fluid after cooling may cause a decrease in pressure inside the pipe, forming negative pressure. Negative pressure can damage the internal structure of the sensor (such as peeling off the lining and metal conduit, electrode leakage). Protective measures: Install a negative pressure prevention valve near the flowmeter. When the valve is opened, it can be connected to atmospheric pressure to balance the pressure inside the pipe. If a vertical pipeline is connected downstream, avoid using upstream valves to regulate flow, otherwise negative pressure may form inside the measuring pipe. It is necessary to prevent negative pressure by adding back pressure (such as installing elbows or regulating valves) or using downstream valves for regulation. Reserved maintenance space for instrument well installation: Large caliber flow meters are often installed in instrument wells, and sufficient space needs to be reserved for pipeline installation, wiring, inspection, and maintenance. Installation height: The instrument should be at a certain height above the ground (usually recommended not less than 0.5 meters) for easy observation, wiring, cleaning, and installation operations, while avoiding damage to the equipment caused by damp ground or stagnant water. Other precautions: Grounding requirements: Ensure that the sensor and converter are well grounded to avoid electromagnetic interference affecting measurement accuracy. Environmental conditions: Avoid strong vibrations, strong magnetic fields, or high temperature environments to prevent equipment performance degradation or damage. Regular inspection: After installation, it is necessary to regularly check the condition of the filter screen,

Solid flow meter | Electromagnetic flow meter: selection of range and flow rate

1. Precautions for installation of split type electromagnetic flowmeter

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