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How to choose a tipping bucket rain gauge

by:Rika Sensors     2021-10-15
How to choose a tipping bucket rain gauge
Rainfall from the sky to the ground, the depth of the water layer that accumulates on the water surface without evaporation, infiltration, or loss, we call it rainfall (in millimeters), which can intuitively indicate the amount of rainfall.

At present, the main tools used by meteorology and hydrology to measure rainfall are tipping bucket rain gauges. The tipping bucket rain gauge flows the received rainfall into a small bucket, and when it reaches a certain amount, it is automatically dumped, and the corresponding rainfall record is formed at the same time, and it is converted into a digital information output in the form of a switch, which meets the requirements of national hydrology, Measurement requirements for weather stations, smart agriculture and other scenarios.

With the increase in demand, many tipping bucket rain gauges have emerged on the market, and the quality is uneven. So how should we choose tipping bucket rain gauges? After many investigations and comparisons, the editor summarized the following three points, hoping to help everyone!

First point: The rain-bearing caliber must conform to the national standard.

The national standard GB/T 11832-2002 'Tipping Bucket Rain Gauge' (issued by the General Administration of Quality Supervision, Inspection and Quarantine) stipulates that the inner diameter of the rain-bearing port is 200mm. When measuring the rainfall per square meter, the measured rainfall per minute is divided by the cross-sectional area of u200bu200bthe rain-bearing mouth. If the rain-bearing mouth is inaccurate, the calculated data is wrong. The editor found that many rain gauges on the market have only 160mm or 120mm rain gauges, so you should pay attention to them when you buy them.

The second point: The rain-bearing mouth must be in the shape of a blade

The national standard GB/T 11832-2002 'Tipping Bucket Rain Gauge' stipulates that the material of the rain-bearing mouth should be solid, and its mouth should be a blade. Shape, smooth inner wall, no trachoma. Burrs, bruises, peeling of the coating. Defects such as leakage. The cutting edge has an acute angle of 40°~45°, and the rain entering the rain-bearing vent should not splash out of the rain-bearing vent.

The cutting edge must be as sharp as a knife. The function is to make it clear that the raindrops fall within or outside the rain-bearing caliber. Consider using a thin stainless steel plate to replace the cutting edge. There is no guarantee that the raindrops falling on the stainless steel plate will eventually fall into the barrel or out of the barrel. This will increase the measurement error and not meet the national standard. There are also manufacturers who use stainless steel to bend the cutting edge, which cannot achieve the effect of the cutting edge in the national standard.

The tipping bucket rain gauge, the inner diameter of the rain opening is 200mm, the stainless steel tube wall is used, the edge is a sharp edge of 44°, the inner wall is smooth, the wetting loss is small, and the accuracy is high. The service life is more than 7 years, and it is durable. It complies with the national standard GB/T 11832-2002 'Tipping Bucket Rain Gauge'.

The third point: tipping should be sensitive

The sensitivity of tipping directly determines the accuracy of measurement, so be sure to check whether tipping is sensitive when buying.

The tipping bucket rain gauge adopts leading design technology, which greatly reduces the friction resistance, makes the flip more sensitive and the measurement more accurate.

The above is the summary of the editor. There are many products on the market, so you must pay attention when choosing!



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