Rain And Snow Gauge

How Rain And Snow Gauge works:

Rain And Snow Gauge measures total precipitation from rain, snow, sleet and hail by collecting rain and snow in heated water collectors.Rain And Snow Gauge is based on weighing principle technology and uses high-precision weighing sensors to measure the "precipitation increment" and can carry out all types of precipitation such as solid (snowfall), liquid (rainfall) and solid-liquid mixed (sleet, frozen rain) Quantity monitoring.

Hardware configuration: Rain And Snow Gauge is mainly composed of main control device, rain bearing port, water collector, drainage device, weighing sensor, protective shell, mounting base, windproof ring, etc.

Comply with national standards:

The SL/T 811.4-2021 "Precipitation Observation Instruments" issued by the Ministry of Water Resources of the People's Republic of China Rain And Snow Gauge Standard for the Water Conservancy Industry.

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

Power supply: 10~30V DC

Average power consumption:

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

Rain And Snow Gauge communication method:

Pulse type: The user obtains the number of pulses on and off times of the rain meter, and calculates the rainfall in different time periods based on the corresponding resolution of the rain meter.

RS485 type: The rainfall meter is Modbus-RTU protocol. The device comes with a clock. It has a variety of defined rainfall programs internally, including "Rainfall on the day", "Minute rainfall on the day", "Yesterday rainfall" and "Total Rainfall, rainfall intensity and other parameters can be directly read through 485 specifications.

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 of soil;

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 weighing sensors.

The acquired weight information is converted into pulses, RS485 output signal.

When the water volume reaches the set threshold, the drainage device will automatically drain.

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

Chengyukou:

The depth of the inner wall of Chengyu mouth is greater than 100mm, which ensures that the rainfall entering Chengyu mouth will not splash outside Chengyu mouth.

Inner diameter of Chengyukou φ200+0.6mm

Acute angle of blade 40°~45°

Water collector:

The water collector is located below the rain entrance and collects precipitation. It is a stainless steel cylindrical structure.

The default capacity of the water collector is 28L, and it supports the linkage main control device to control automatic drainage.

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 the antifreeze is mixed with precipitation, some antifreeze will be discharged during the process. If drainage occurs in winter, please pay attention to changing the antifreeze.

Evaporation inhibition oil floats on the surface of the liquid due to its low density and will not be automatically removed with the liquid.

Weighing sensor:

The weighing parts use a piezoelectric weighing sensor to induce pressure changes, converting the precipitation increment into the corresponding precipitation output.

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

Protective shell:

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

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

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

Installation base:

The base is installed for easy loading and unloading, and plays a certain protective role on the load sensor, drainage device, and main control device.

The installation base is firm and reliable, and should have vibration damping and leveling functions.

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

Windproof ring:

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

In sites where solid precipitation monitoring needs, the installed Rain And Snow Gauge should be equipped with a windproof ring.