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Industrial-Grade Optical Rain Gauge RG-9 Rain Sensor

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Industrial-Grade Optical Rain Gauge RG-9 detects the size of raindrops and provides information on rain intensity to the users. It features easy-installation and maintenance-free, suitable for applications in weather and climate studies, hydrological network monitoring, agriculture, and other scenarios that need monitoring rainfall.

In stock
  • 10+: $44.00



Needing Rain Gauges measuring accurate rainfall volume and intensity? Our Industrial-Grade Optical Rain Gauge RG-15 would be your option. We also provide a chart showing the difference between RG-9 and RG-15 down below for you. Please feel free to check and learn more!


Please send email to sensecap[at]seeed[dot]cc to request any technological support for this product.


  • Industrial-grade: round and reliable lens surface which discourages the collection of debris and dirt
  • Easy-installation: on weather station masts, buildings, and other infrastructures
  • Maintenance-free: as a low maintenance rain gauge, it can be used for 7-10 years without replacement
  • Compacted Sized: as small as a tennis ball
  • Wide Application Scenarios
Rainfall volume provides important information for people's decisions and actions in weather and climate studies, hydrological network monitoring, agriculture, food delivery, and many other industries. Taking agriculture as an example, rainfall is one of the most important sources of water for plant cultivation. With accessible precipitation information, farmers can make sound decisions for the irrigation schedule and amount, thus make sure there is sufficient water for crop growth, and not too much water that leads to waste, root rot, or other diseases.
Detecting rain intensity is of vital importance. Thus, this industrial-grade RG-9 Rain Sensor is a perfect fit. It's a reliable, cost-effective, maintenance-free, and compacted rain gauge that uses the change in light beams intensity to determine the rainfall status and the size of raindrop. It sensitively detects when raining is starting and when it is not.
This industrial-grade optical rain gauge is intended to replace conventional tipping buckets of rain gauges. It uses beams of infrared light within a plastic lens which are about the size of tennis balls. It is maintenance-free: with the round surface of the lens, there are no collections of debris, no moving parts to stick, or water-pathways to clog. The sensitivity levels include: Rain Drops, Very Light, Medium, and Heavy. The duration of the positive detection is also selectable: No Hold, Hold Time 5 Minutes, Hold Time 10 Minutes, and Hold Time 15 Minutes.
RG-9 Solid State Rain Sensor features an open-collector output that emulates a conventional tipping bucket, as well as RS232 serial communications that provide more detailed data allowing for configuration of the device. It can be configured through the serial port, or optionally via DIP switches. A built-in mounting arm allows for convenient mounting to weather station masts, buildings, and other infrastructure. It's also suitable for solar-powered applications.


  • Smart Agriculture
  • Smart City
  • Climate Studies
  • Hydrological Network Monitoring
  • Condensation and Frost Sensing
  • Irrigation Control 
  • Drop Detection
  • Process Control
  • Opening and Closing Skylights, Vents, Louvers, or Windows


Input Voltage Range 5-15 VDC on J1 Reverse polarity protected to 50V or 3.3VDC through pin 8 on J2
Current Drain 110 uA nominal. (No outputs on, dry not raining) 2-4 mA when raining
Output NPN Open Collector Output 500 mA / 80V/300mW Max
Operating Temperature -40°C to +60°C (Will not detect rain when freezing)
DIP Selectable Sensitivity Rain Drops
Very light
RS232 Port 3.3V
Supported Baud Rates 1200, 2400, 4800, 9600, 19200, 38400, 57600
High Accuracy Tipping Bucket -
Wiper Control - -
Drop Detection - -
Condensation Sensing - -
Irrigation Control - -
Rain Water Harvest - -
"It's Raining Mode" -
Low Power
Unique Hardware - -
Current Drain 110 uA Nominal 4 mA Raining 110 uA Nominal 4 mA Raining
Tipping Bucket Accuracy ±10% in our controlled environment -
Serial Communication RS232 Command Based Bidirectional Command Based Bidirectional



HSCODE 9031900090
USHSCODE 9026104000
EUHSCODE 9013101000
COO China
RoHS 1




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  1. Documentation
    Product Quality
    from order view
    Delivery was quick to the UK. The RG-9 works really well and is well made. And Seed Studio had the best price I could find anywhere.


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