The WS401 Weather Sensor measures air temperature / relative humidity / air pressure / precipitation.

From the WS product family of professional intelligent measurement transducers with digital interface for environmental applications. It has an Integrated design with ventilated radiation protection.

Model: 8377-U01

Relative humidity is measured by means of a capacitive sensor element; a precision NTC measuring element is used to measure air temperature. Optionally, the WS401-UMB can be equipped with a leaf wetness sensor in addition. Precipitation is measured by tipping spoon and tipping bucket processes. The flexible tipping bucket allows a 0.2mm or a 0.5mm resolution of the rainfall.

Measurement output can be accessed by the following protocols: UMB-Binary, UMB-ASCII, SDI-12, MODBUS.

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Technical Data

Additional Equipment

• WS401-UMB	8377-U01
  Dimensions	Ø approx. 150 mm, height approx. 380 mm
  Weight	approx. 1.5kg
  Temperature
  Principle	NTC
  Measuring range	-50...60°C
  Accuracy	±0.2°C (-20°C...+50°C), otherwise ±0.5°C (> -30 ° C)
  Relative humidity
  Principle	capacitive
  Measuring range	0…100% RH
  Accuracy	±2% RH
  Precipitation
  Resolution	0.01mm
  Accuracy	±2%
  Air Pressure
  Principle	MEMS capacitive
  Measuring range	300...1200 hPa
  Accuracy	±0.5hPa
  General Information
  Protection type housing	IP65
  Interface	RS 485 2-wire, half duplex
  Operating power consumption	24 VDC +/- 10% < 4VA (without heating)
  Operating humidity range	0...100%
  Operating temperature range	-50...60°C

• Accessories
  Surge protection	8379-USP
  Power supply 24V/2.5A	8366-USV4
  Power supply 24V/4A	8366-USV1
  Traverse Mounting Bracket	8367-TRAV1
  Digital-analog-converter	8160-UDAC
  Temperature Sensor WT1	8160-WT1
  Rain sensor WTB100	8353-10
  WS Cables	8370-UKAB (several lengths available)
  Tripod, Portable Tripod Mast 6 to 10 ft	ME905
  Converter Cable RS485 to USB	8160-RS485USB
  GPRS/GSM modem with Camera Port	8160-MODVIOLA
  RS232 Connection Cable	8160-KAB
  Netronix node with Thiamis ICU	RN500ICU820
  Surge Protector for night vision cameras	8379USPRJ45