Weighing Rain Gauge

How Weighing Rain Gauge works:

Weighing Rain Gauge can be used to measure not only liquid precipitation, but also solid precipitation and solid-liquid mixed precipitation by real-time bucket weight change.Weighing Rain Gauge is based on weighing principle technology and uses high-precision weighing sensors to measure "precipitation increments". It can measure all types of precipitation, including solid (snowfall), liquid (rainfall), and solid-liquid mixed states (sleet, freezing rain). monitor.

Hardware configuration: Weighing Rain Gauge is mainly composed of a main control device, a rain-bearing opening, a water collector, a drainage device, a load cell, a protective shell, an installation base, and a windproof ring.

Comply with national standards:

SL/T 811.4-2021 "Precipitation Observation Instrument" issued by the Ministry of Water Resources of the People's Republic of China is the Weighing Rain Gauge standard for the water conservancy industry.

QX/T 320-2016 "Weighing Rain Gauge Meter" issued by the Meteorological Administration of the People's Republic of China is the meteorological industry Weighing Rain Gauge standard.

Power supply: 10~30V DC

Average power consumption:

High cold type: 30W (equipped with heating module, powered by DC12V)

Weighing Rain Gauge communication:

Pulse type: The user obtains the pulse on-off times of the rain gauge and calculates the rainfall in different time periods based on the corresponding resolution of the rain gauge.

RS485 type: The rain gauge adopts the Modbus-RTU protocol. The device has its own clock and a variety of defined rainfall programs are preset internally, including "rainfall of the day", "rainfall of minutes", "rainfall of yesterday", "total rainfall". Rainfall", "Rainfall Intensity" and other parameters, users can directly read the above rainfall data through 485 designation

Resolution: 0.1mm/0.2mm/0.5mm/1mm

Rain intensity range: 6~1800mm/h

Typical accuracy:

When the precipitation is ≤10mm, the maximum allowable error is 0.2mm;

When the precipitation is >10mm, the maximum allowable error is ±2%;

Working environment: -35℃~+65℃, 0%RH~95%RH non-condensing

Main control device:

Collect real-time data from load cells.

Convert the acquired weight information into pulse and RS485 output signals.

When the water volume reaches the set threshold, the drainage device is controlled to drain automatically.

The temperature on site is low, and the heating equipment is controlled to avoid freezing of rain and snow.

Chengyukou:

The depth of the inner wall of the rain-bearing opening is greater than 100mm, which ensures that rainfall entering the rain-bearing opening will not splash out of the rain-bearing opening.

The inner diameter of the rain-bearing mouth is φ200+0.6mm

Sharp edge angle 40°～45°

Water collector:

The water collector is located under the rain-bearing opening to collect precipitation. It is a stainless steel cylindrical structure.

The water collector capacity is 28L by default and supports automatic drainage controlled by the linkage main control device.

Drainage device:

When the water volume reaches 80% of the water collector capacity, the drainage device starts to control automatic drainage.

The drainage process of the drainage device lasts about 1 minute. The rainfall is not measured during the drainage period. After the drainage is completed, about 1-2L of liquid will remain in the water collector.

Because antifreeze is mixed with precipitation, part of the antifreeze will be discharged during the process. If drainage occurs in winter, pay attention to replacing the antifreeze.

The evaporation-inhibiting oil floats on the surface of the liquid due to its low density and will not be automatically discharged with the liquid.

Load cell:

The weighing component uses a piezoelectric load sensor to sense pressure changes and convert the precipitation increment into a corresponding precipitation output.

The load cell adopts a closed structure and a load-bearing weighing method.

Protective shell:

The protective shell can protect the precipitation weighing unit, precipitation data processing unit and other parts.

The protective shell is made of stainless steel, and the surface is sprayed with a white matte anti-salt spray corrosion coating.

The shell design is in a "convex" shape, which can prevent wind, reduce evaporation and increase precipitation capture.

Installation base:

The installation base facilitates loading and unloading, and plays a certain protective role for the load cell, drainage device, and main control device.

The installation base should be firm and reliable, and should have vibration reduction and leveling functions.

Made of stainless steel, the surface is sprayed with white matte anti-salt spray corrosion coating.

Windproof ring:

The windproof ring is composed of a circular keel, a T-shaped frame, and a single windshield. The surface is sprayed with a white matte anti-salt spray corrosion coating.

In sites where solid precipitation monitoring is required, the installed Weighing Rain Gauge should be equipped with a windproof ring.