Rainfall Measuring Instrument – Tipping Bucket Rain Gauge

A rainfall measuring instrument is used to measure the amount of precipitation received at a specific location. For automatic weather stations, agriculture, hydrology and remote environmental monitoring, the tipping bucket rain gauge is one of the most widely used automatic rainfall measurement instruments.

The NiuBoL rainfall sensor collects rain through a Φ200 mm collector and converts each calibrated tipping event into rainfall data. The standard configuration provides 0.2 mm resolution and can be supplied with pulse, voltage or RS485 communication depending on the selected model.

It can be connected to an automatic weather station, PLC, RTU, data logger or IoT gateway for unattended rainfall monitoring and remote data transmission.

What Is a Rainfall Measuring Instrument?

A rainfall measuring instrument measures precipitation as an equivalent water depth, normally expressed in millimeters (mm).

For example:

1 mm rainfall = 1 liter of water per square meter

Rainfall can be measured using several technologies, including manual gauges, tipping bucket gauges, weighing gauges and electronic rainfall sensors. For automatic field monitoring, tipping bucket instruments provide a practical combination of automatic measurement, digital integration and relatively simple maintenance.

NiuBoL Tipping Bucket Rainfall Measuring Instrument

The NiuBoL tipping bucket rainfall sensor is designed for automatic measurement of liquid precipitation. Rain enters through the collector and is directed into the internal tipping mechanism.

Rainfall Measuring Instrument Specifications

Actual specifications and output configuration should be confirmed according to the selected model before ordering.

How Does a Tipping Bucket Rain Gauge Work?

The instrument contains a collector, funnel and two-sided tipping bucket mechanism.

The measurement process is:

1. Rain falls into the collector.

2. The funnel directs the water toward one side of the tipping bucket.

3. When the calibrated water volume is reached, the bucket tips.

4. The opposite side moves into the collection position.

5. The tipping event generates an electrical signal.

6. The logger counts the number and timing of tipping events.

7. The system converts those events into accumulated rainfall and rainfall intensity.

For a 0.2 mm tipping bucket instrument:

Rainfall Amount vs Rainfall Intensity

These two measurements should not be confused.

The rain gauge counts tipping events to determine rainfall accumulation. The time interval between tipping events can also be used by the logger or software to calculate rainfall intensity.

Main Components of the Rain Gauge

A tipping bucket rainfall measuring instrument normally contains:

• Outer protective enclosure

• Rainfall collector

• Water-guiding funnel

• Tipping bucket assembly

• Magnetic or switching detection mechanism

• Level adjustment system

• Drainage outlet

• Signal cable or RS485 transmitter

• Mounting feet

The collector and internal water path should remain clean so that all collected rain reaches the tipping mechanism correctly.

Pulse vs RS485 Rainfall Measurement

The correct output type depends on the data-acquisition system.

For a new IoT project, the output should be selected according to the PLC, RTU, data logger or gateway that will receive the rainfall measurement.

Rainfall Monitoring System Architecture

An automatic rain gauge can operate as an independent rainfall sensor or as part of a complete weather monitoring system.

Rain Gauge → Pulse / RS485 → Data Logger → 4G / Ethernet → MQTT / HTTP → Cloud or Private Server

A complete system can also combine rainfall with wind, temperature, humidity, atmospheric pressure, solar radiation and soil measurements.

Where Is a Rainfall Measuring Instrument Used?

1. Automatic Weather Stations

Rainfall is one of the main meteorological parameters measured by an automatic weather station. The rain gauge can operate together with temperature, humidity, wind and pressure sensors.

2. Hydrological Monitoring

Rainfall data can be combined with river level, reservoir level and flow measurements to analyse precipitation and catchment response.

3. Flood Monitoring

Real-time rainfall amount and intensity provide useful inputs for flood-monitoring systems. A rain gauge does not predict flooding by itself; rainfall data normally needs to be combined with water level, previous rainfall, catchment information and hydrological models or warning logic.

4. Agriculture and Irrigation

Rainfall measurements help determine natural water input to farmland. Rainfall data can be combined with soil-moisture measurements when planning irrigation.

5. Reservoir and Water Resource Management

Rain gauges installed across a catchment can provide precipitation data for reservoir inflow analysis, flood-control planning and water-resource management.

Rain Gauge in an Automatic Weather Station

The rainfall measuring instrument can be installed together with other meteorological sensors on a complete automatic weather station.

A typical station may include:

• Rain gauge

• Wind speed sensor

• Wind direction sensor

• Air temperature and humidity sensor

• Atmospheric pressure sensor

• Solar radiation sensor

• Data logger

• Solar panel and battery

• 4G or other communication equipment

How to Install a Tipping Bucket Rain Gauge

Choose an Open Location

Install the instrument in a representative open area and minimize interference from nearby buildings, trees and other obstacles.

Keep the Gauge Level

The tipping mechanism depends on correct leveling. Use the built-in level indicator where provided and adjust the mounting feet before operation.

Use a Stable Mounting Base

The support should remain stable during wind and severe weather. Excessive vibration can affect measurement quality.

Prevent Splash Interference

Avoid installation positions where rainwater can splash from nearby roofs, walls or ground surfaces into the collector.

Protect the Cable

Route the cable securely and protect it from machinery, rodents, standing water and mechanical damage.

Rain Gauge Maintenance and Calibration

A tipping bucket rain gauge is not maintenance-free and should not be described as permanently self-calibrating.

Periodic inspection is important because outdoor conditions can affect the collector and tipping mechanism.

• Remove leaves, insects, dust and mud from the collector.

• Check the funnel and drainage path for blockage.

• Confirm that the tipping bucket moves freely.

• Verify that the instrument remains level.

• Inspect cables and connectors.

• Compare or calibrate the gauge periodically according to project requirements.

• Check measurements if unusually high or low rainfall values appear.

Calibration frequency depends on the monitoring standard, operating environment and project requirements. There is no universal interval suitable for every installation.

Factors That Affect Rainfall Measurement Accuracy

Can a Tipping Bucket Rain Gauge Measure Snow?

A standard unheated tipping bucket rainfall measuring instrument is mainly intended for liquid precipitation.

Snow, freezing rain and other frozen precipitation require an appropriate heated or specialized precipitation gauge. Heating requirements should be confirmed according to local climate and project specifications.

How to Select a Rainfall Measuring Instrument

Before ordering, confirm:

• Required rainfall resolution

• Expected maximum rainfall intensity

• Liquid rain only or snow / freezing conditions

• Pulse, voltage or RS485 output

• PLC, RTU or data logger compatibility

• Power supply

• Cable length

• Installation environment

• Quantity

• Solar power requirements

• 4G or other remote communication requirements

• Cloud platform or private server requirements

Rainfall Measuring Instrument FAQ

Q1. What instrument is used to measure rainfall?

A1. A rain gauge is used to measure rainfall. Automatic systems commonly use tipping bucket rain gauges, weighing gauges or electronic rainfall sensors.

Q2. What does a tipping bucket rain gauge measure?

A2. It measures accumulated liquid precipitation. The timing of tipping events can also be used to calculate rainfall intensity.

Q3. What does 0.2 mm resolution mean?

A3. For this tipping bucket configuration, each completed tip represents 0.2 mm of rainfall.

Q4. Is 0.2 mm resolution the same as ±0.2 mm accuracy?

A4. No. Resolution is the smallest reported rainfall increment. Accuracy describes how close the measured rainfall is to the reference value.

Q5. Can a tipping bucket rain gauge measure rainfall intensity?

A5. Yes. Rainfall intensity can be calculated from the number and timing of tipping events.

Q6. Is a tipping bucket rain gauge self-calibrating?

A6. No. Its mechanical structure is calibrated to a defined tipping volume, but installation, contamination and mechanical changes can affect measurements. Periodic inspection and calibration or comparison are recommended according to the project requirements.

Q7. Can this rainfall instrument use RS485?

A7. Yes. An RS485 configuration is available for integration with compatible PLCs, RTUs, data loggers and IoT gateways.

Q8. Can several rainfall stations send data to one server?

A8. Yes. Each station can use an appropriate data logger or gateway to send measurements to a centralized cloud platform or private server.

Q9. Can the rain gauge operate with solar power?

A9. Yes. A complete remote rainfall-monitoring station can use a solar panel and battery. The power system should be sized according to the logger, communication equipment and required autonomy.

Q10. Can a standard rain gauge measure snow?

A10. A standard unheated tipping bucket is intended mainly for liquid precipitation. Snow and freezing conditions require a suitable heated or specialized instrument.

Rainfall Measuring Instrument Datasheets

NBL-W-ARS-Tipping-bucket-rain-gauge-instruction-manual.pdf

NBL-W-RS-Rain-sensors-instruction-manual-V4.0.pdf

Request a Rainfall Measuring Instrument Quotation

NiuBoL provides tipping bucket rainfall sensors and complete rainfall-monitoring systems for meteorology, agriculture, hydrology, reservoirs and environmental monitoring.

For quotation, provide the required quantity, rainfall resolution, output signal, cable length, installation country and whether you require a data logger, solar power, 4G communication or private-server integration.

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