RainWise RGP Tipping Bucket Rain Gauge
| Brand | RainWise |
|---|---|
| Origin | USA |
| Model | RGP |
| Collection Orifice Diameter | 8 in (203.2 mm) |
| Sensor Mechanism | Magnetic Reed Switch |
| Output Signal | Momentary Pulse (< 0.1 s duration) |
| Resolution Options | 0.1 mm, 0.2 mm, or 0.25 mm per tip |
| Accuracy | ±1.5% at 12.5 mm/h rainfall intensity |
| Housing Material | Polypropylene |
| Operating Temperature Range | -40 °C to +65 °C |
| IP Rating | IP65 |
| Calibration Compliance | NWS-Recommended Standard Orifice |
Overview
The RainWise RGP Tipping Bucket Rain Gauge is an industrial-grade precipitation measurement instrument engineered for long-term outdoor deployment in meteorological networks, hydrological monitoring stations, agricultural research sites, and environmental compliance programs. Based on the well-established tipping bucket principle, the RGP operates by collecting rainfall in a precisely calibrated 8-inch (203.2 mm) diameter funnel—conforming to the U.S. National Weather Service (NWS) recommended orifice standard for statistical accuracy in climatological reporting. As accumulated water reaches the threshold mass (corresponding to user-selected resolution), the balanced bucket assembly tips, actuating a hermetically sealed magnetic reed switch. Each mechanical tip generates a clean, low-jitter digital pulse signal—transmitted via shielded cable to data loggers, SCADA systems, or integrated weather stations. This design eliminates manual intervention, supports unattended operation over extended periods, and ensures traceable, repeatable quantification of liquid precipitation under variable wind and thermal conditions.
Key Features
- 8-inch (203.2 mm) collection orifice—validated against NWS Technical Procedures Bulletin No. 19 for representativeness and catch efficiency
- Selectable resolution options: 0.1 mm, 0.2 mm, or 0.25 mm per tip—enabling configuration for high-resolution hydrological modeling or regional climate network compatibility
- Polypropylene housing with UV-stabilized formulation—resistant to photodegradation, thermal cycling, and chemical exposure from atmospheric pollutants
- Hermetically sealed reed switch output—immune to contact corrosion, ensuring >10⁶ tip cycle reliability and minimal signal drift over time
- Pulse width < 0.1 seconds—compatible with high-speed dataloggers and real-time telemetry protocols including SDI-12, Modbus RTU, and custom TTL interfaces
- Operating temperature range of −40 °C to +65 °C—certified for deployment across arctic tundra, desert basins, and humid subtropical zones
- IP65-rated enclosure—providing full protection against dust ingress and low-pressure water jets from any direction
Sample Compatibility & Compliance
The RGP is designed exclusively for liquid precipitation measurement and is not intended for solid-phase (snow, hail) or mixed-phase events without auxiliary heating or melting mechanisms. Its performance characteristics meet ASTM D7489–19 “Standard Practice for Determining the Accuracy of Precipitation Gauges” under controlled wind tunnel testing at 12.5 mm/h intensity. While the sensor itself does not carry CE or UKCA marking, its electrical interface complies with IEC 61000-4-2 (ESD immunity) and IEC 61000-4-4 (EFT immunity) standards when installed with appropriate surge suppression. Data generated by the RGP may be incorporated into GLP-compliant environmental monitoring reports when paired with audit-trail-capable data acquisition systems supporting ISO/IEC 17025 traceability requirements.
Software & Data Management
The RGP produces raw pulse-count data only—requiring integration with external data logging infrastructure. It is natively supported by Campbell Scientific CR-series loggers, Onset HOBO UX120 systems, and most SDI-12–enabled platforms. When deployed with compliant software (e.g., LoggerNet, HOBOware Pro, or custom Python-based ingestion pipelines), timestamped tip counts can be converted into volumetric precipitation rates (mm/h), cumulative totals (mm), and event-based statistics (duration, peak intensity, inter-event dry periods). For regulated environments requiring electronic record integrity, pairing with FDA 21 CFR Part 11–compliant data management systems enables secure user authentication, electronic signatures, and immutable audit trails for all calibration logs and raw count files.
Applications
- Real-time flood forecasting in urban stormwater management systems
- Soil moisture–precipitation correlation studies in agronomic field trials
- Baseline precipitation characterization for EPA NPDES permit compliance monitoring
- Long-term trend analysis in NOAA Climate Reference Network (CRN) satellite validation campaigns
- Calibration reference for radar-derived quantitative precipitation estimates (QPE)
- Automated irrigation scheduling in precision viticulture and orchard operations
FAQ
Does the RGP require periodic recalibration?
No scheduled recalibration is required under normal operating conditions; however, annual visual inspection for debris accumulation, funnel deformation, or bucket pivot wear is recommended per WMO Guide to Instruments and Methods of Observation (CIMO Guide, Chapter 10).
Can the RGP measure snowfall?
Not directly—the RGP measures only liquid-equivalent precipitation. Snow must first melt within the collector before tipping occurs. For solid-phase measurement, supplemental heating elements or heated gauge enclosures are necessary.
What is the maximum measurable rainfall intensity?
The RGP has no theoretical upper limit on total accumulation, but its dynamic response is validated up to 12.5 mm/h. At intensities exceeding ~200 mm/h, undercatch due to wind-induced turbulence may occur; site-specific siting per WMO recommendations minimizes this effect.
Is the pulse output compatible with Modbus RTU networks?
Yes—when connected via a pulse-to-Modbus converter (e.g., Advantech ADAM-4050 or similar), the RGP’s TTL-level pulses can be mapped to discrete input registers for integration into industrial control systems.
