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1. Regarding the principle of open channel flowmeter and selection of weir channel - Tangshan Dafanghui Instrument
The open channel flowmeter adopts the principle of "liquid level method", which measures the liquid level in the standard water weir channel and calculates the flow value by combining the formula. The following will explain the principles, types of weirs, and selection points:
1. Working principle of open channel flowmeter. An open channel flowmeter consists of three parts: a converter, a liquid level sensor, and a standard water weirs. Liquid level measurement: The liquid level sensor monitors the liquid level height in the weirs in real time and converts the liquid level signal into an electrical signal. Flow calculation: The converter automatically calculates instantaneous flow and cumulative flow based on the flow formula corresponding to the liquid level height and weir type. Output function: Supports multiple signal outputs (such as 4-20mA, RS485, etc.) for remote monitoring and data integration.
II. Types and Characteristics of Standard Weir Troughs. The open channel flowmeter is equipped with 11 types of standard weir grooves, suitable for different flow ranges and scenarios: thin-walled weirs, 90 ° triangular thin-walled weirs: suitable for small flow rates (0.1-10 L/s), simple structure, and easy installation.
. Rectangular thin-walled weir: with a wide flow range (1-1000 L/s), it requires high water flow conditions. Trapezoidal thin-walled weir: Combining the advantages of rectangular and triangular weirs, suitable for medium flow rates (10-5000 L/s). Equal width thin-walled weir: stable flow measurement, but high installation accuracy is required. Wide top weir type rec
III. Key points for selecting weir channels: Matching flow range and selecting weir channel type based on actual flow requirements.
. For example, for small flow rates (<10 L/s), priority should be given to selecting a 90 ° triangular thin-walled weir or a rectangular thin-walled weir. High flow rate (with vertical and horizontal flow>1 m3/s): It is recommended to use a Parshall trough or a rectangular wide topped weir. Adaptability of water flow conditions to impurity containing water flow: Choose weirs with strong anti clogging ability (such as flat V-shaped weirs and circular edge wide top weirs). Irregular cross-section: When selecting a triangular cross-section weir or a Parshall trough, the flow rate should be calculated based on the liquid level and cross-section shape. Installation and mainten
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