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Tipping bucket rain gauge helps understand the amount of rainfall

by:Rika Sensors     2021-10-03
Tipping bucket rain gauge helps understand the amount of rainfall

For the amount of rainfall, we have many words or idioms to describe, such as: heavy rain, pouring rain, violent storm, pattering, etc., these words are familiar to everyone, such as pouring rain, meaning like Pouring heavy rain describes the appearance of very heavy rain, while pattering describes the sound of light rain falling. But the description of words is often not as accurate as the data.

From the perspective of meteorology, the so-called rainfall is the depth of rain that falls on a horizontal surface (without leakage, evaporation, loss, etc.) within a certain period of time. Measured with a rain gauge, usually using 24 hours as the time unit and millimeter as the rain depth unit, and the rain is divided into light rain, moderate rain, heavy rain, heavy rain, heavy rain and extra heavy rain, that is, the rainfall within 24 hours of 0.1 mm to 9.9 mm It is light rain. The rainfall within 24 hours is between 10.0mm and 24.9mm as moderate rain. Heavy rain refers to the rainfall within 24 hours between 25.0mm and 49.9mm. Heavy rain refers to the rainfall within 24 hours from 50.0mm to 99.9mm. , Rainfall between 100.0 mm and 249.9 mm within 24 hours is called a heavy rainstorm, and a rainstorm with a rainfall of 250.0 mm or more within 24 hours becomes an extremely heavy rainstorm. So how does the rain gauge monitor rainfall?

The working principle of the rain gauge

At present, the tipping bucket rain gauge is the most widely used. The tipping bucket rain gauge is a remote rain measurement instrument composed of a sensor and a signal recorder. It is composed of a water receiver, an upper tipping bucket, a metering tipping bucket, a counting tipping bucket, and a reed switch; the recorder is composed of a counter, a pen recording, a self-recording clock, and a control circuit board. The tipping bucket is injection-molded of engineering plastics and is divided into two half-cone chambers of equal volume with a middle partition. It is a mechanical bistable structure. When one chamber receives water, the other chamber is in a waiting state. When it rains, the rainwater collected by the water receiving port is injected into the metering bucket through the funnel. When the volume of the received rainwater reaches a predetermined value of 0.2mm, the chamber will overturn by itself due to gravity and be in a waiting state, and the other chamber will be in a state of receiving water. When the water receiving capacity reaches the predetermined value, the bucket is turned over again and is in a waiting state. A magnetic steel is installed on the side wall of the tipping bucket, which scans from the side of the dry reed tube when the tipping bucket flips to make the dry reed tube on and off. That is, every time the tipping bucket is overturned, the dry reed pipe is switched on and sends out a pulse signal, so that the rain process can be measured back and forth.

Based on the above principle, the tipping bucket rain gauge can measure and record various rainfall information. It has strong anti-interference ability, all-outdoor design, accurate measurement, long transmission distance, small size, high accuracy, and comprehensive Features such as automatic unattended operation, stable operation, etc., can be used in hydrological automatic forecasting systems for flood control, water supply dispatching, power station and reservoir water regime management, etc.

The core component of the tipping bucket rain gauge-the tipping bucket is made of all stainless steel, with a three-dimensional streamlined design, with a drooping curved surface guide tip, which makes the tipping bucket more smooth, and has self-cleaning dust, easy The function of cleaning. When connecting to the telemetry terminal, it should be equipped with a matching interface circuit to prevent counting and reporting errors caused by the jitter of the reed pipe and the rebound of the bucket. The internal structure assembly is completed when leaving the factory, and there is no need to carry out on-site installation of the internal structure, which is convenient for on-site installation.

The tipping bucket rain gauge can guide customers in terms of data acquisition and control systems that enable it to measure all required parameters. The inner diameter of the rain-bearing mouth is 200mm, and the edge of the rain-bearing mouth is in the shape of a blade. The angle of the blade of the rain-bearing mouth should be within the range of 40°~45°, which meets the requirements of 'Tipping Bucket Rain Sensor' GB/T21978.2-2014 National standard requirements, effectively ensure the accuracy of rainfall monitoring, support 485 signal and pulse type signal output, and have two types of products with a resolution of 0.2 and 0.5.



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