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OTT Pluvio² S

Compact universal weighing precipitation gauge

The OTT Pluvio² S weighing precipitation gauge measures the intensity and cumulative precipitation in a broad measuring range from 0 to 3,000 mm/h.

The professional rain gauge is a further development of the tried-and-tested OTT Pluvio², with state-of-the-art technology in a compact design that captures up to 400 mm of precipitation on a collecting area of 200 cm². It is virtually maintenance-free, fits onto 2-inch pedestals, needs little space and can replace conventional rain gauges or tipping buckets without any structural work.

  • Cumulative precipitation, precipitation intensity, bucket content in real time and non real time
  • Weighing principle
  • Compact all-weather precipitation gauge for 2-inch pedestals, highly accurate, meets WMO requirements (Guidelines No. 8), nearly maintenance-free, lifetime calibrated
  • SDI-12, RS-485, impulse, status
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  • Compact and relatively light precipitation gauge, with a weather resistant collecting bucket for 400 mm of precipitation (200 cm² collecting area)
  • Minimum space requirement - no problem to install on existing 50 cm x 50 cm concrete bases • any suitable vibration-free 2-inch pedestals can be used again
  • The intensity and cumulative data output fulfils the WMO directive No. 308
  • Highly-developed data capture and processing with signal analysis, filtration and noise reduction as well as algorithms that compensate for the influences of temperature and wind
  • Considerable measuring accuracy of ±1 mm, wide measuring range, and a high data accessibility of 99%
  • Output of high precipitation intensities of up to 3,000 mm/h without any time delay
  • Precise capture of the finest precipitation from as little as 0.03 mm of precipitation in an hour
  • Optionally available with adjustable ring heater – prevents the formation of ice or snow caps and keeps the orifice rim free • also deployable in solar operation in reduced voltage mode
  • Various output interfaces (SDI-12, RS-485, pulse/contact), configurable through USB by means of tablet PC or notebook
  • Low overall operation costs – lifelong calibrated ice-free, drift-free and virtually maintenance-free measuring device

The OTT Pluvio² S is designed for professional use, and is suited for automated and semi-automated measuring networks, especially in locations where only limited space is available.


  • Automated meteorological measuring networks
  • Weather observer measuring networks
  • Urban hydro-meteorological measuring networks
  • Precipitation stations for flood warnings and precipitation-runoff modelling
  • Precipitation stations as part of research projects
  • Weather radar systems for calibration and Z/R correlation
Leaflet - Compact weighing precipitation gauge - OTT - Pluvio² S (EN)
Manual OTT Pluvio² L Modbus
Operating Instructions - Precipitation gauge - OTT - Pluvio² S (EN)
OTT Pluvio - Firmware V1.05.0
Firmware for Pluvio²L, Pluvio²S
OTT_Pluvio² S_Declaration_of_Conformity_DE_EN_FR
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Recordable precipitation Liquid, solid, and mixed
Recordable precipitation amount 400 mm (approx. 8 l)
Collecting area 200 cm²
Measurement method Weighing measurement method
Sensor element Hermetically sealed load cell
Measuring ranges
Precipitation 0 ... 50 mm/min or 0 ... 3000 mm/h
Cumulative precipitation threshold at 60 min. collection time 0.03 mm
Precipitation intensity threshold 0.1 mm/h or 6 mm/h
Accuracy (at -25°C ... +45°C)
Amount ± 0.1 mm or ±1% of measured value
Intensity ± 0.1 mm/min or ± 6 mm/h or ±1% of measured value
SDI-12 and RS-485 Amount: 0.001 mm
Intensity: 0.001 mm/min or 0.01 mm/h
Impulse output 0.05/0.1/0.2 mm, adjustable
Query interval
Amount 6 sec ... 60 min
Intensity 1 min
Output delay
Real-time < 1 min
Non-real-time (filterd values) 5 min
Measurement output
Measured data Intensity RT, amount RT/NRT, amount NRT, amount total NRT, bucket content RT and NRT, temperature of load cell
Status output Pluvio² S status, heating status (if present)
Electrical data
Serial interfaces SDI-12 V1.3, RS-485 (2- or 4-wire), SDI-12 protocol and command line mode (ASCII)
Digital outputs (2/5 Hz) Impulse 0.05/0.1/0.2 mm (adjustable); status 0 ... 120 impulses/min
USB (2.0) For service mode
Power supply 5.5 ... 28 V DC, secured against reverse polarity
Current consumption (without heating) Typically 9.2 mA at 12 VDC
Power consumption (without heating) < 110 mW
Ring heating, optional
Power supply 12 ... 28 VDC, typ. 12/24 VDC, secured against reverse polarity
Heating capacity 24 VDC / max. 50 W, temperature control range 45 K (wind speed 0 m/s);
12 VDC / max. 12.5 W, temperature control range 12 K (wind speed 0 m/s)
Modes of operation of heater control system Disabled, continuously enabled, continuously enabled within a specified temperature range, US NWS standard (time-controlled), enabled in case of precipitation (adjustable after-run time)
Operating range of orifice rim heater -40 °C ... + 60 °C (ambient temperature)
Mechanical data
Dimensions and weight
Pluvio² S 288 mm x 651 mm (Ø x h)
Pedestal Ø 2" / 50 ... 60 mm
Weight Approx. 7.8 kg (empty bucket)
Base plate Stainless steel/aluminium
Collecting bucket/bucket support/pipe housing ASA, UV resistant
Environmental conditions
Temperature, in operation -40 ... +60 °C
Temperature, storage -40 ... +70 °C
Relative humidity 0 ... 100 % rF (non-condensing)
Protection and Standards
Pipe housing closed IP65
Pipe housing open IP63
Load cell IP67
EMC 2004/108/EG; EN 61326-1:2013
Salt resistance EN 60068-2-11
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