Tianjin Solid Flow Meter | Explosion proof Electromagnetic Flow Meter Range

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1. Electromagnetic flowmeter: Selection of range and flow rate

The range of anti-corrosion electromagnetic flowmeter should be greater than the expected maximum flow value, and the normal flow value should be slightly greater than 50% of the full range; The selection of flow velocity should be based on the characteristics of the fluid. For general industrial media, it is recommended to have a flow rate of 2-4m/s, while viscous fluids can have a flow rate greater than 2m/s. For media containing solid particles, the flow rate should be less than 3m/s. In special cases, the minimum flow rate should not be less than 0.2m/s and the maximum flow rate should not exceed 8m/s. The principle of range selection: Range definition and core requirements. The range (Q) of anti-corrosion electromagnetic flowmeter refers to its maximum measurable flow range. The core requirement is that the range must cover the maximum flow value in actual working conditions, while avoiding a decrease in measurement accuracy caused by a large range at low flow rates. The specific standard is that the range Q should be greater than the expected maximum flow rate value, and the normal operating flow rate value should be slightly greater than 50% of the full scale of the flow meter. For example, if the maximum flow rate is expected to be 100m3/h, the measurement range should be chosen to be above 120m3/h, and the measurement accuracy is highest when the daily flow rate is maintained at 60-80m3/h (i.e. 50% -70% of the full range). After determining the flow velocity (V), the correlation calculation between the range and caliber can be used to calculate the required inner diameter (D) of the pipeline using the formula Q=π D2V/4, in order to select

the appropriate caliber flowmeter. Among them, Q is the flow rate (unit: m3/h), D is the inner diameter of the pipeline (unit: m), and V is the flow velocity (unit: m/s, to be calculated uniformly at m/h). For example, if the range Q is 100m3/h and the flow velocity V is 3m/s (i.e. 10800m/h), substituting the formula yields D ≈ 0.11m (i.e. 110mm). At this point, a flow meter with a diameter of DN100 or DN125 needs to be selected. The principle of selecting flow velocity is generally within the range of industrial medium flow velocity. The flow velocity of the measured medium in conventional industrial anti-corrosion electromagnetic flow meters should be between 2-4m/s. Within this range, measurement accuracy and equipment lifespan can be balanced: low flow bridge velocity (such as<0.2m/s) may result in insufficient signal strength, while high flow velocity (such as>8m/s) may exacerbate electrode and lining wear. Special fluid velocity adjustment for viscous fluids: The velocity must be greater than 2m/s. High flow velocity can automatically eliminate viscous substances (such as grease, polymers, etc.) attached to the electrode through fluid flushing, avoiding signal distortion caused by adhesion and thus improving the accuracy of measuring sensitive skin. Medium containing solid particles: The commonly used flow velocity should be less than 3m/s. Solid particles (such as sand and dust) accelerate the wear of liners (such as rubber and polytetrafluoroethylene) and electrodes at high flow rates, shortening equipment life. Extreme working conditions: In special circumstances (such as pipeline diameter limitations, process requirements), the minimum flow velocity should not be less than 0.2m/s (to avoid signal drift), and th

Tianjin Solid Flow Meter | Explosion proof Electromagnetic Flow Meter Range

1. Electromagnetic flowmeter: Selection of range and flow rate

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