OTT HydroMet

- Model WAD 200 - Weighing Rain Gauge with autmoatic drain

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The OTT WAD 200, a weighing technology combined with a self-emptying collecting system, was developed in addition to the OTT Pluvio² series and is specially designed for the use in subtropical and tropical climates. The new precipitation gauge’s unique measurement principle fulfils the WMO guideline requirements. It issues the measured values on cumulative and precipitation intensity in real time and also in severe weather conditions including hurricanes and typhoons in the impressive range of 0.001 to 720 mm/h. The calibration is performed by means of an ISO standard reference calibration weight instead of the water volume to detect only a low intensity value.

  • Parameters measured: Percipitation intensity and amount in real-time from 0,001 to 720 mm/h
  • Measurement technology: Weighing principle with tipping bucket
  • Product Highlights: Continuous and consistent rain monitoring technology with cumulative data output according WMO guide line No 8
  • Interface: SDI-12 / RS-485, pulse, analog output

  • Installation on 2”-pipe and 200 cm² collecting surface
  • Intensity and amount data output according WMO guide line No 8 with impressive range of 0.001 to 720 mm/h
  • Low power consumption and advanceddata acquisition and processing for signal analysing, filtering and noise reduction
  • Applied algorithm for compensation of temperature and wind induced errors
  • Multiple data interfaces (SDI-12, RS485, pulse output) to be configured by USBport or controlled by commands
  • Weatherproof and durable metal housing for high MTBF
  • Life time calibrated, drift-free instrument
  • Ideal step response for real time intensity and cumulative data
  • The self-emptying, power-saving system can be solar-powered and used unsupervised in remote locations

  • Precipitation Measurement: Both cumulative precipitation and intensity in real-time from 0.001 to 720 mm/h.
  • Early Flood Warning: When combined with water level sensors, the WAD 200 is the central component in an early flood warning system.
  • Urban hydrology: Even with extreme rain events with up to 720 mm/h, the WAD 200 issues the measured values in real time and with high accuracy. Also suitable for the automatization of precipitation monitoring networks to replace the manual, check and tipping bucket gauges.

General:

  • Recordable precipitation: Liquid
  • Collecting area: 200 cm²
  • Capacitiy: 0,2 mm bucket, self-emptying
  • Measurement method: Weighing precipitation gauge
  • Sensor element: Hermetic sealed load cell

Measuring range:

  • Percipitation: 0,001 to 720 mm/h (28 inches/h)
  • Resolution: 0,001 mm/0,001 mm/h (0,00004 inches)
  • Accuracy: ±0,1 mm or ±3 % / ±0,1 mm/h, ±6 mm/h or ±3 %

Electrical parameters:

  • Electronics: 9,8 to 32VDC / 160 mW (SDI-12 & pulse output)

Interfaces:

  • USB: Configuration / Service-Mode
  • Serial Interface; SDI-12 / RS458 2-wire
  • Baude rate: 1200 (SDI-12) / 2400 to 19200 baud (RS458)
  • Pulse output: 0,01 / 0,1 / 0,2 / 0,5 / 1,0 mm
  • Status output: Rain yes / no
  • Analogue output: 0/4 ... 20 mA oder 0 ... 2/5 V

Data output

  • Real time (RT): Intensity & cumulative precipitation
  • Status: Operational mode, hardware
  • Ouput interval: 1 min (intenitiy) / 1 to 60 minutes
  • Output formats: SDI-12 V1.3: metric & imperial units / RS-485 (galvanic isolated): ASCII.TXT and MODBUS

Mechanical parameters:

  • Dimension (Ø x h): 292 mm x 190 mm
  • Weight: 2,5 kg

Material:

  • Pipe house / funnel / rim / mounting platform: Aluminum alloy
  • Load cell: Stainless steel
  • Bucket: Monolithic
  • Mounting / Installation Ø: 2' / 60 mm


Environmental conditions

  • Operating temperature: 0 ... +70°C
  • Storing temperature: -50°C ... +70°C
  • Protection class: Load cell: IP 67 / Instrument: IP 64
  • Wind speed survival: 60 m/s

EMC / EMI and Norms

  • EMC / EMI EN: 61000-4-3, CE conform
  • RoH: 2011/65/EU
  • Norms: WM-NO 8, VDI 3786 BI.7

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