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1. Range of explosion-proof electromagnetic flowmeter
The range of explosion-proof electromagnetic flowmeter needs to be determined by nuclear or combined with flow rate, diameter, and actual working conditions. Its typical range of backflow is 0.16 m3/h to 100000 m3/h, depending on the diameter of the pipeline and the characteristics of the medium. The following is a detailed explanation:
1. The influence of flow rate on the range of measurement. Conventional operating conditions: The flow rate of the measured medium should be 2-4 m/s, and the range of measurement can be calculated using the formula Q=π D2V/4 (Q is the flow rate, D is the inner diameter of the pipeline, and V is the flow rate). Special operating conditions: low flow rate: The minimum flow rate should not be less than 0.2 m/s, otherwise it may cause unstable measurement or inability to start. High flow velocity: The maximum flow velocity should not exceed 8 m/s, exceeding this value may cause cavitation, vibration, or lining wear. Medium containing solid particles: The commonly used flow velocity should be less than 3 m/s to reduce wear on the lining and electrodes. Viscous fluid: The flow velocity can be selected to be greater than 2 m/s, and the flow velocity can be used to automatically remove viscous substances attached to the electrode, improving measurement accuracy.
2. Correspondence between Diameter and Range The range of explosion-proof electromagnetic flowmeter is directly related to the diameter of the pipeline, and the larger the diameter, the wider the range.
. The common caliber and corresponding range are as follows: Small caliber (DN10~DN100): DN10: 10.16~2.5 m3/hDN251.0~16 m3/hDN50: 4.0~60 m3/hDN100: 16~
3、 Precautions for range selection: The range should cover the maximum flow rate: the range Q of the flowmeter should be greater than the expected maximum flow rate value to avoid measurement failure due to flow exceeding the limit. The relationship between normal flow rate and full range: The normal flow rate value should be slightly greater than 50% of the full range scale of the flowmeter. For example, when the full range is 100 m3/h, the recommended normal flow rate is 50-60 m3/h. Avoid extreme flow rates: If the medium flow rate is consistently below 0.2 m/s or above 8 m/s, it is necessary to optimize the operating conditions by adjusting the diameter or adding flow rate control devices (such as pumps and valves). Adaptation of medium characteristics: For media containing solid particles, it is preferable to choose a large-diameter flowmeter and reduce the flow velocity (such as DN200, flow velocity ≤ 3 m/s). Viscous fluid: Choose a medium caliber and increase the flow velocity (such as DN100, flow velocity ≥ 2 m/s).
Example of practical application of range: Industrial water treatment: If the pipeline diameter is DN150 and the expected maximum flow rate is 400 m3/h, a flow meter with a range of 40-600 m3/h can be selected (DN150 corresponds to a range of 40-600 m3/h), and the normal flow rate is controlled at 200-300 m3/h (50% -75% of the full range).
. Chemical viscous liquid transportation: If the pipeline diameter is DN80, the medium viscosity is high, and the expected maximum flow rate is 100 m3/h, a fl