OTT - Model Parsivel2 -Laser Present Weather Sensor
The OTT Parsivel² is a modern laser disdrometer for comprehensive measurement of all precipitation types. The Parsivel² captures both the size and speed of falling particles, classifying them into one of 32 separate size and velocity classes. The raw data are used to calculate the type, amount, intensity and kinetic energy of the precipitation, the visibility in the precipitation, and the equivalent radar reflectivity.
Direct and simultaneous physical measuring principle of hydrometeors
The Parsivel² captures both the size and speed of falling particles by applied laser extinction method.
Classification of each single hydrometeors
Classification into one of 32 separate size and velocity classes and particles distribution in numbers.
Precise particles size measurements and uncertainty of rain intensity with +-5% according WMO guide line
Distinction of type of present weather and calculation of the type, amount, intensity and kinetic energy of the precipitation, the visibility in the precipitation, and the equivalent radar reflectivity.
Life time calibration and drift free measurement
Automatic compensation of temperature induced error and laser fluctuation emittance.
Unattended and maintenance free
Automatic compensation of contamination on optics by dust and aerosal layers.
Technical Attributes
- *Parameters Measured:
- Precipitation type
- Intensity
- Drop size distribution
- Radar reflectivity
- Accuracy:
- ± 1 size class ( 0.2 - 2 mm)
- ± 0.5 size class ( > 2 mm)
- ± 5 % (liquid) /± 20 % (solid)
- Classification: 32 size and 32 velocity classes
- Dimensions: 26.4 x 23.6 x 4.5 in (670 x 600 x 114 mm)
- Heating capacity:
- 50 W (default)
- 100 W (adjustable)
- IEC/EN 60825-1: 2014
- Installation Requirement: 2 in pipe (50.8 mm), Ø 1.97 in - 2.44 in (Ø 50 - 62 mm)
- Intensity Threshold: 0,001 - 47 in/h (0,001 - 1200 mm/h)
- Interface: RS-485 for all values incl. spectral data (EIA-485; 1,200 - 57,600 Baud) SDI-12 for calculated values USB for PC connection (configuration and service) Output relay for pulse output of the precipitation amount in 0.1 mm/pulse with max. 2 Hz pulse rate
- IP Rating: IP65, resistant to salt spray
- Kinetic energy: 0 - 999,999 J/(m2h)
- Laser Class: 1
- Measurement technology: Laser optical
- Measuring Range:
- Size:
- Liquid precipitation: 0.008 - 0.315 in (0.2 - 8 mm)
- Solid precipitation: 0.008 - 1.0 in (0.2 - 25 mm)
- Velocity:
- 0.65 - 65.6 ft/s (0.2 - 20 m/s)
- Velocity:
- 0,65 - 65.6 ft/s (0.2 - 20 m/s)
- Measuring surface: 7.1 x 1.2 in (180 x 30 mm)
- Power Consumption: 65 mA@24 V DC
- Power Output: 0,2 mW
- Power Supply: 10 - 28 V DC, reverse polarity protection Optimum heating output of the sensor head heating system can be guaranteed with a power supply voltage of at least 20 V DC.
- Product highlights: Simultaneous measurement of 32 classes for particle sizes and velocities
- Protection:
- De-icing protection:
- Microprocessor controlled heating
- Lightning protection:
- Integrated
- Radar reflectivity: - 9.999 - 99.999 dBz
- Relative Humidity: 0 - 100 %
- Reports:
- WMO 4680/4677 (SYNOP)
- 4678 (METAR/SPECI) and NWS tables
- Special Notes: Proof under laboratory conditions using an OTT test system with reference particle simulation of 0.02 in (0.5 mm), 0.04 in (1.0 mm), 0.08 in (2.0 mm) and 0.16 in (4.0 mm)
- ASDO configuration software supplied (basic version)
- Standards: EN 61326-1: 2013, CE compliant 2014/30/EU, CE compliant
- Temperature Range: -40 - 158 °F (-40 - 70 °C)
- Types of precipitation: Drizzle, rain, hail, snow ˂gt/˃ 97 % (compared to a weather observer) Snow depth intensity (volume equivalent)
- Visibility in precipitation: 0 - 12.4 miles (0 - 20.000 m)
- Wavelength: 650 mW
- Weight: Max. 14 lbs (6.35 kg)
- Discharge
- Flow and Discharge
- Flood Warning
- HydroMet