1. Overview
The Dragino WSS-21 Rain Gauge is a weather monitoring instrument designed to accurately measure and report rainfall. It utilizes a precision tipping bucket mechanism to detect rainfall, engineered with a 3D streamline shape to ensure smooth operation and ease of cleaning. This model is an upgraded version of the WSS-01.
The WSS-21 is specifically designed to integrate seamlessly with the Dragino Weather Station solution. It connects via an RS485 interface to a WSC1-L main processor, which then automatically detects the rainfall data and uploads it to a LoRaWAN Server for remote monitoring and analysis.
Key Features:
- RS485 Rain Gauge for reliable data transmission.
- Durable ABS enclosure.
- Horizontally adjustable for optimal positioning.
- Compact design for easy installation.
- Equipped with vents under the funnel to prevent blockages from leaves or debris, ensuring accurate rain flow.
2. Specifications
| Parameter | Value |
|---|---|
| Model Number | WSS-21 |
| Resolution | 0.2 mm |
| Accuracy | ±1% |
| Rainfall Strength Range | 0 mm ~ 4 mm/min (max 8 mm/min) |
| Input Power | DC 5-24V |
| Interface | RS485 |
| Working Temperature | 0°C ~ 70°C |
| Working Humidity | <100% (non-condensing) |
| Power Consumption | 4mA @ 12V |
| Weight | 1400g |
| Dimensions | 29 x 29 x 29 cm |
3. Package Contents
The standard package for the Dragino WSS-21 Rain Gauge typically includes:
- 1x Dragino WSS-21 Rain Gauge Unit
- 1x Connecting Cable (RS485 interface)
- Mounting Screws/Bolts for ground installation
Note: If you intend to install the WSS-21 on a pole, the WS-K2 bracket kit must be purchased separately.
4. Installation and Setup
4.1 Site Selection
Choose a location that is open and free from obstructions (e.g., trees, buildings) that could block rainfall or cause splashing, ensuring accurate readings.
4.2 Mounting the Rain Gauge
- Ground Installation: Use the provided screws to securely mount the WSS-21 to a stable, horizontal surface on the ground.
- Pole Installation (Optional): If mounting on a pole, use the separately purchased WS-K2 bracket kit. Ensure the pole is vertical and stable.
- Leveling: The tipping bucket mechanism requires precise leveling for accurate measurements. After mounting, adjust the bottom of the rain gauge horizontally until it is perfectly level.
4.3 Electrical Connection
The WSS-21 connects to a Dragino WSC1-L Main Process Unit via its RS485 interface. Follow these steps for connection:
- Connect the WSS-21's RS485 cable to the corresponding RS485/Modbus input on the WSC1-L unit.
- Ensure all connections are secure to prevent data loss or power issues.
- The WSC1-L and connected sensors are typically powered by a solar power system via an MPPT (Maximum Power Point Tracking) charge controller. Ensure the power supply to the WSC1-L is stable and within the DC 5-24V range required by the WSS-21.
5. Operation
Once properly installed and connected to the WSC1-L Main Process Unit, the Dragino WSS-21 Rain Gauge operates automatically:
- Rainfall Detection: As rain falls into the funnel, it collects in one side of the tipping bucket. When a specific amount of water (corresponding to the 0.2mm resolution) is collected, the bucket tips, emptying the water and bringing the other side into position to collect rain. Each tip is recorded.
- Data Transmission: The WSS-21 transmits the detected rainfall data via its RS485 interface to the connected WSC1-L.
- Data Upload: The WSC1-L processes the data from the WSS-21 and other connected sensors, then uploads this information to a LoRaWAN Server.
- Monitoring: Users can access and monitor the rainfall data through a dashboard provided by their chosen application server, which receives data from the LoRaWAN Server.
6. Maintenance
Regular maintenance ensures the longevity and accuracy of your WSS-21 Rain Gauge:
- Cleaning: The tipping bucket's 3D streamline shape is designed for easy cleaning. Periodically inspect the funnel and tipping bucket for any accumulated debris, leaves, or dirt. Clean gently with water and a soft brush if necessary.
- Funnel Vents: Ensure the vents located under the funnel remain clear to prevent blockages and ensure proper rain flow into the tipping bucket.
- Leveling Check: Periodically verify that the rain gauge remains perfectly horizontal. Strong winds or ground shifts can affect its level, impacting accuracy.
- Cable Inspection: Check the RS485 connecting cable for any signs of wear, damage, or loose connections.
7. Troubleshooting
Common Issues and Solutions:
- No Rainfall Data / Inaccurate Readings:
- Check Leveling: Ensure the rain gauge is perfectly horizontal. An unlevel device will cause inaccurate tipping.
- Clear Obstructions: Verify that the funnel and tipping bucket are free from leaves, debris, or insect nests.
- Cable Connection: Inspect the RS485 cable for secure connections to both the WSS-21 and the WSC1-L. Check for any physical damage to the cable.
- Power Supply: Confirm that the WSC1-L unit, which powers the WSS-21, is receiving adequate and stable power (DC 5-24V).
- Operation in Freezing Temperatures:
- The WSS-21 is designed for operation between 0°C and 70°C. Below 0°C, water can freeze and turn into ice, which will prevent the tipping bucket from functioning correctly and may cause damage. It is not recommended for use in conditions where temperatures consistently drop below freezing without additional protective measures (not provided with this unit).
If issues persist after performing these checks, please refer to the WSC1-L manual or contact Dragino support.
8. User Tips
No specific user tips were available from external reviews or Q&A for this product at this time. Always ensure the device is level and free from debris for optimal performance.
9. Warranty and Support
For information regarding warranty coverage, technical support, or service, please contact your retailer or the manufacturer, Dragino, directly. Ensure you have your product model number (WSS-21) and purchase details available when seeking support.
