1. Measurement principle
Venturi tube flowmeter is a differential pressure meter for flow measurement. Venturi tubes are divided into standard Venturi tubes and general Venturi tubes according to the results. When the fluid that fills the tube body, when it flows through the throat of the venturi tube, it forms a local contraction, so the flow velocity increases and the static pressure decreases, thereby forming a pressure difference. The structure of the Venturi tube is relatively simple, and there is no sharp edge abrasion and fouling problems similar to the orifice plate throttling during use, and it can affect the main distribution gradient of the fluid velocity in the tube before the throttling and various non-axisymmetric problems that may be affected. The speed and distribution are scientifically and effectively rectified, so that the flow control measurement with high accuracy and high stability can be realized.
2. Performance characteristics
High measurement accuracy, the use of high-precision differential pressure transmitter can achieve accurate flow measurement.
The measurement system has good stability, the flow coefficient remains constant for a long time, and the verification period is long.
The measurement range (turndown ratio) is wide, and it can reach more than 10:1 without software correction of the sub-meter.
It has strong ability to adapt to medium, and can measure system high-pressure and low-pressure fluids, high-humidity gases and fluids with various products dirty.
The installation requirements for straight pipe sections are low, which can effectively avoid or reduce the additional measurement uncertainty of the measurement system.
The pressure is huge, the loss is small, and the resources are saved.
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