WS303-UMB
From the Lufft WS product family of professional intelligent measurement transducers with digital interface for environmental applications.
Key features
- All-in-one housing concept of a compact weather sensor combining several measurement parameters in one housing with only one cable connection
- Integrated Kipp & Zonen CMP3 Pyranometer, which is tiltable
- Built-in data pre-processing, universal interfaces and selectable output protocols
- Maintenance-free operation – no moving parts that can wear out
- Compatible with many commercially available Met/HydroMet data loggers and PLS systems thanks to an open communication protocol
- Suitable for all climate zones; also for solar-powered automatic meteorological stations
- Ventilated temperature and humidity measurement according to WMO guidelines
- Integrated heater that can be switched on if there is danger of frost
The WS303-UMB Smart Weather Sensor for measuring of air temperature, relative humidity, solar radiation, and air pressure. Relative humidity is measured by means of a capacitive sensor element; a precision NTC measuring element is used to measure air temperature. The world renowned technology of Kipp & Zonen CMP3 is integrated. Measurement output can be accessed by the following protocols: UMB-Binary, UMB-ASCII, SDI-12, MODBUS. One external temperature or rain sensor is connectable.
Technical specification
| Principle | NTC |
| Measuring Range | -50...60°C |
| Accuracy | ±0,2°C (-20°C...+50°C), otherwise ±0.5°C (>-30°C) |
| Principle | Capacitive |
| Measuring Range | 0...100% RH |
| Accuracy | ±2% RH |
| Response Time (95%) | < 18s |
| Non-stability (change/year) | < 1% |
| Non-linearity (0 to 1,000 W/m²) | < 1% |
| Directional error (at 80° with 1,000 W/m²) | < 20 W/m² |
| Temperature dependence of sensitivity | < 5% (-10 bis 40°) |
| Tilt error (at 1000 W/m²) | < 1% |
| Spectral range (50% points) | 300 to 2,800nm |
| Measuring range | 1400 W/m² |
| Altitude | 0...60° |
| Azimuth | -10°...10° |
| Principle | MEMS Capacitive |
| Measuring Range | 300...1200 hPa |
| Accuracy | +/- 0.5 hPa (...+40°C) |
| Heating | 20VA at 24VDC |
| Interface | RS485, 2-wire, half-duplex |
| Operating Power Consumption | 4....32 VDC |
| Operating Humidity Range | 0...100% |
| Operating Temperature Range | -50...60%°C |
