1. Working principle of portable open channel flowmeter

The working principle of portable open channel flowmeter is based on non-contact ultrasonic measurement technology, which measures the liquid level height in the open channel weir trough through acoustic reflection, and combines the mathematical relationship between flow rate and liquid level to achieve flow calculation. The specific principle is as follows:

1. Ultrasonic liquid level measurement non-contact detection: the instrument emits ultrasonic pulses to the liquid level of the open channel, and the sound waves reflect back to the sensor after encountering the liquid level. By calculating the round-trip time (time difference) of the sound waves and the known sound speed, the liquid level height is obtained. Advantages: No mechanical transmission components, avoiding wear and tear, with features such as maintenance free, long service life, and strong anti-interference ability; Digital signal processing technology further improves measurement stability and accuracy. 2. Mathematical conversion of flow rate and liquid level. Flow characteristics of open channels: In open channels, the flow rate is positively correlated with the liquid level height - the larger the flow rate, the higher the liquid level; The smaller the flow rate, the lower the liquid level. The function of a measuring weir groove is to establish a definite functional relationship between flow rate and liquid level by installing geometric dimensions and material fixed measuring weir grooves (such as triangular weirs, rectangular weirs, Bacher grooves, etc.). For example, a triangular weir: The relationship between flow rate (Q) and liquid level (H) is (Q=C cdot H ^ {2.5}) ((C) is the weir channel coefficient). Rectangular weir: flow rate (Q=C cdot H ^ {1.5} cdot sqrt {2g} cdot B) ((B) is the width of the weir mouth, (g) is the acceleration due to gravity). Simplified measurement: The measuring weir converts tedious flow measurement into easy to implement liquid level measurement, directly calculating flow rate through preset formulas. 3. Error comparison and calibration The instrument has a built-in standard flow model, which substitutes real-time measured liquid level data into preset functions to calculate theoretical flow values, and compares them with actual flow rates to correct errors. Digital processing technology: By using algorithms such as signal filtering and noise suppression, environmental interference (such as water flow fluctuations and temperature changes) is eliminated to ensure measurement accuracy. 4. Technical advantages: high reliability: no mechanical components, reduced failure rate, suitable for long-term field use. Low power design: suitable for portable devices, extending battery life. Strong adaptability: It is compatible with various types of water measuring weirs and channels, meeting the needs of different scenarios. Summary: Portable open channel flow meters use ultrasonic non-contact measurement of liquid level, combined with the flow level function relationship of the measuring weir, to achieve efficient and accurate flow calculation. Its core advantages lie in maintenance free, anti-interference, and low power consumption, and it is widely used in fields such as environmental monitoring and water conservancy engineering.

2. HX-F5 Portable Open Channel Flow Meter (Flow Meter Comparison Device)

HX-F5 Portable Open Channel Flow Meter (Flow Meter Compar

『SILVER Official Website SERVICE』