Flow meter liquid| venturi tube flow meter

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1. What flowmeter is good for slow liquid flow rate? When the liquid flow rate is slow, it is preferred to choose elliptical gear flowmeter, electromagnetic flowmeter or Coriolis mass flowmeter that are sensitive to low flow rate. 1. The elliptical gear flowmeter measures flow rate by a fixed volume driven by liquid to rotate the elliptical gear, with high accuracy (± 0.5%~1%) and minimal viscosity impact. Suitable for high viscosity fluids such as crude oil and Mu Lu lubricating oil, and can maintain accurate measurement even in low flow rate environments. two The electromagnetic flowmeter measures flow velocity based on the principle of generating electromotive force by cutting magnetic induction lines with conductive liquid, with minimal pressure loss and the ability to capture extremely low flow velocities (such as below 0.1m/s). Conductive liquids such as acid, alkali, and salt solutions are commonly used in this type and are widely used in the chemical and water treatment industries. three The Coriolis mass flowmeter utilizes the Coriolis effect generated by fluid vibration to directly measure mass flow rate, with the highest accuracy and no interference from temperature and density. Low flow rate scenarios with strict requirements such as pharmaceuticals and food processing are preferred, but there are high requirements for installation location and liquid cleanliness.

2. Factors and solutions affecting liquid flow meters

Factors and solutions affecting liquid flow meters

1. Installation factors influencing factors: Sensor flange is not aligned with the central axis of the pipeline: If the sensor flange of the flow meter is not aligned with the central axis of the pipeline, or if the pipel

ine temperature changes, stress will be generated, causing asymmetry or deformation of the detection probe, leading to zero drift and measurement errors.

. Solution: Strictly follow the installation specifications: Ensure that the sensor flange is parallel to the pipeline flange and aligned with the center during the installation of the flowmeter. Zeroing and inspection: After installation, call out the "Zeroing Menu" and record the factory zero preset value. After zero adjustment, observe the zero value at this time. If there is a large difference between the two values, it indicates that the installation stress is large, and it should be reinstalled. 2. Environmental vibration and electromagnetic interference influencing factors: Environmental vibration: The measuring tube of the flowmeter is sensitive to external vibration. If there are other vibration sources, it can cause abnormal vibration and zero drift. Electromagnetic interference: The sensor vibrates the measuring tube by exciting the coil. If there is a large magnetic field interference nearby, it will affect the measurement results. Solution: Choose advanced technology flow meters: Choose flow meters with DSP digital signal processing technology and MVD technology to reduce signal noise and optimize measurement signals. Stay away from interference sources: When designing, stay away from large transformers, motors, and other equipment that generate large magnetic fields. Take isolation measures: When vibration interference cannot be avoided, use flexible pipe connections, vibration isolation support frames, and other isolation measures.

III. Influencing factors of measuring medium pressure: Differences between operating pressure and calibration press

Flow meter liquid

2. Factors and solutions affecting liquid flow meters

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