Flow meter

The working principle of electromagnetic flow meters is based on Faraday’s Law of Induction: when a conductive fluid flows through a magnetic field, it cuts through the magnetic flux lines, generating an induced electromotive force (EMF). The magnitude of this EMF is proportional to the flow velocity, which is then used to calculate the flow […]

1. Core Principle (Kármán Vortex Street) When fluid flows past a non-streamlined vortex generator, alternating vortices are formed on either side, arranged in a regular pattern (Kármán Vortex Street). Vortex shedding frequency: f=St×vdf = St times frac{v}{d} StSt : Strouhal number (approximately 0.16–0.22, stable within Reynolds number 2×1032 times 10^3  to 7×1067 times 10^6 )

Choosing the right flowmeter is a critical decision that directly affects the accuracy, reliability, and efficiency of your flow measurement process. Here’s a comprehensive guide to help you select the appropriate flowmeter for your application. 1. Fluid and Operating Conditions (The Foundation of Selection) Accurate fluid characterization and working conditions are key to determining the

1. Introduction A Differential Pressure Flow Meter (DP Flow Meter) measures flow rate by detecting the pressure difference generated by a primary element installed in a pipeline. The flow rate is calculated based on: Measured differential pressure Known fluid properties Geometric dimensions of the primary element and pipe A typical DP flow measurement system consists

1. Abnormal Cumulative Flow in Mass Flow Meter Troubleshooting: A mass flow meter at a plant showed cumulative flow even when there was no process flow. Upon inspection, it was found that the supports at both ends of the sensor did not meet installation requirements. Specifically, the support distances were uneven, and the bottom of

Thermal mass flow meters, commonly used for measuring the mass flow rate of gases or small amounts of liquids, may experience significant fluctuations, leading to unstable readings that can impact process control. The causes of such fluctuations should be investigated from multiple aspects, including the properties of the medium, instrument installation, equipment parameters, and external

1. Issue: Display of the 8800D Saturated Steam Flowmeter Shows Low Readings Fault Diagnosis: This was a newly installed meter. Upon rechecking the settings, it was found that the flow measurement unit was set incorrectly— the range upper limit of 16,000 kg/h was mistakenly set to 16,000 m³/h. Fault Resolution: After correcting the range upper

A Practical Troubleshooting Case Study In industrial steam measurement systems, discrepancies between sub-meters and the main flow meter are not uncommon. One particularly confusing situation is when the branch flow meter shows a stable flow rate, while the main meter continuously indicates zero flow. Is this a sensor failure?A wiring problem?Or is the issue hidden

Abstract Small-signal cutoff is an essential technique in industrial flow measurement used to suppress erroneous readings caused by zero drift, noise, and non-ideal process conditions.Although the phenomenon is common across all flowmeter types, the mechanisms that generate small signals differ significantly depending on measurement principle, instrument quality, environmental factors, and installation conditions.Appropriate cutoff configuration therefore

Selecting the proper electrode and liner materials is critical to ensure accuracy, reliability, and long service life of electromagnetic flow meters.Material choices must be made according to fluid properties such as corrosion, abrasiveness, temperature, and pressure. 1. Electrode Material Selection Principles Electrodes are in direct contact with the process fluid and serve as the signal