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WS303-UMB Smart Weather Sensor - discontinued

Compact all-in-one weather sensor for measurement of temperature, relative humidity, radiation and air pressure.

DISCONTINUED
DISCONTINUED

From the WS product family of professional intelligent measurement transducers with digital interface for environmental applications. Integrated design with ventilated radiation protection for measuring: Air temperature, relative humidity, radiation and air pressure. One external temperature or rain sensor is connectable.

IMPORTANT: WS303-UMB Smart Weather Sensor is discontinued

  • Temperature, relative humidity, radiation and air pressure
  • NTC/T, Capacitive/RH, Tiltable Pyranometer Kipp&Zonen/Radiation, MEMS capacitive/Pressure
  • Compact all-in-one weather sensor, low power, aspirated radiation shield, maintenance-free operation, open communication protocol
  • RS485 with supported protocols UMB-Binary, UMB-ASCII, Modbus-RTU, Modbus-ASCII, XDR and SDI-12
  • 8374.U11

WS303-UMB Smart Weather Sensor is discontinued

Please check the alternative: WS503

Advantages of the Smart Weather Sensor WS303

  • 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 tuiltable
  • Built-in data pre-processing, universal interfaces and selectable output protocols
  • Compatible with many commercially available Met/HydroMet dataloggers and PLS systems thanks to an open communication protocol
  • Maintenance-free operation – no moving parts that can wear out
  • 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

Examples of use of the Smart Weather Sensor WS303

The robust and maintenance-free smart weather sensor WS303 is designed for professional meteorological applications in all climate zones. It delivers reliable data, even in extreme ambient conditions.

Examples of use:

  • PV-Monitoring / Solar Monitoring on photovoltaic farms
  • Hydro-meteorological stations
  • Meteorological reference stations
  • Integration into various other systems/solutions, where these measurement parameters are needed...
EU declaration of conformity - Lufft WS Family
EU declaration of conformity - Lufft WS Family
Firmware - WSXXX
For WSXXX device versions 1 - 29 (see serial number) / Für WSXXX Geräteversionen 1 - 29 (siehe Seriennummer)
Firmware - WSXXX v70
For WSXXX device versions ≥30 (see serial number)
Manual - Lufft UMB Config Tool (EN)
Manual - Lufft UMB Protocol (EN)
Manual - Lufft WSxxx weather sensor (EN)
V49
Software - Lufft - ConfigTool .NET
Version 1.6
Software - UMB Config Tool
Video - Lufft: a passion for precision (Corporate Video)
Video - WS product family - Integration of external sensors
Video - WS product family: 10 Years Lufft WS Product Family - A Success Story
Video - WS product family: Our modular concept of the WS-family
Download as PDF
General
Technical data
Dimensions Ø approx. 150mm, height approx. 392mm
Weight Approx. 1.5kg
Interface RS485, 2-wire, half-duplex
Power supply 4…32 VDC
Power supply 5…11 VDC (electronics with limited precision of measurements)
Power supply 24 VDC +/- 10% (heater)
Power consumption 40 VA (heater)
Operating temperature -50...60°C (with heater)
Operating rel. humidity 0...100% RH
Protection level housing IP66
Cable length 10m
Mast mounting suitable for mast diameter 60 - 76mm
Radiation
Response time (95%) < 18 s
Non-stability (change/year) < 1 %
Non-linearity (0 to 1,000W/m²) < 1 %
Directional error (at 80° with 1,000W/m²) < 20 W/m²
Temperature dependence of sensitivity < 5 % (–10... +40 °C)
Tilt error (at 1000W/m²) < 1 %
Spectral range 300...2800 nm
Measuring range 2000 W/m²
Altitude 0...60 °
Azimuth -10 °...10 °
Temperature
Principle NTC
Measuring range -50 ... 60 °C
Unit °C
Accuracy ±0.2°C (-20...50°C), otherwise ±0.5°C (>-30°C)
Relative humidity
Principle Capacitive
Measuring range 0 ... 100 % RH
Unit % RH
Accuracy ±2% RH
Air pressure
Principle MEMS capacitive
Measuring range 300 ... 1200 hPa
Unit hPa
Accuracy ±0.5 hPa (0...40°C)
Download as PDF

WS product family: Communication after protocol change

How to communicate with a WS-Sensor and the UMB-config-Tool if the protocol was changed for example to Modbus or SDI-12?

After a Reset ( switching On/Off the sensor) every WS-Senor will start up for the first 5 seconds in UMB-protocol and the standard baud rate of 19200Bd. Independend to the configured protocol and baudrate settings of the WS-Sensor.

In this first 5 Seconds you will be able to connect via UMB-config-Tool to the WS-Sensor after this first command was send the UMB-protocol will stay for 10 minutes after that it switches back to the original configured protocol. This Time will always be extended to 10 minutes if a new UMB command was send.

WS product family: SDI-12 wiring plan for Device version >= 42

How to connect a WS-sensor with a device version >= 42 (hardware version >=14) to a SDI-12 system?

The wiring plan has changed compared to the wiring plan of older WS-Sensor device versions.
The new wiring plan is:

  • +VDD = brown
  • GND = white
  • SDI12_Signal = yellow
  • SDI12_GND = white

This is also mentioned as a note in the latest WS-sensor manual in the section 8 Connections

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