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Parsivel 2

The Parsivel² captures both the size and speed of falling particles, classifying them into one of 32 separate size and velocity classes. 

Parameters measured: Precipitation type, intensity, drop size distribution, radar reflectivity
Measurement technology: Laser optical
Product Highlights: Simultaneous measurement of 32 classes for particle sizes and velocities
Interface: SDI-12 / RS-485, pulse

  • Accurate – the exact size and speed of every precipitation particle that passes in the measurement area is recorded and from these measurements all relevant meteorological parameters are derived

  • Maintenance-free –  no moving parts or a collection bucket, unlike tipping bucket rain gauges
  • Durable – continuous and precise precipitation data in all environmental conditions with integrated overvoltage protection
  • Energy-efficient – economical electronics and galvanically separate, controllable head heating, providing a power supply that is flexibly designed with minimal power consumption
  • Easy-to-use – integrated USB port configuration and online monitoring for simple PC data review with OTT ASDO user software


Measurement range


Particle size

of liquid precipitation 0.2 ?... 5 mm

Particle size

of solid precipitation 0.2 ?... 25 mm

Particle velocity

0.2 ...? 20 m/s

Type and identification

precipitation intensity / amount

Distribution of precipitation particles

32 size classes and 32 velocity classes
8 precipitation types (drizzle, drizzle/rain, rain, snow/rain, snow, snow grain, sleet, hail)
radar reflectivity Z

Weather code reports

WMO 4680/4677 (SYNOP), 4678 (METAR) and NWS tables differentiation of precipitation types drizzle, rain, hail, snow ; > 97 % accordance with human observer values

Visibility at precipitation

measurement range (MOR) 100 ... 5000 m; ±10%

Rain rate


Minimal intensity

0.001 mm/h drizzle/rain

Maximal intensity

1.200 mm/h


±5 % (liquid) / ±20 % (solid)

Optical sensor

wave length 780 nm, 0.5 mW output power

Laser diode

Laser class 1, 1 (21 CFR 1040.10 and 1040.11), 1 (IEC/EN 60825-1 A2:2001)

Beam dimension

W x D 180 x 30 mm

Measurement area

54 cm², detection of border events

All weather conditions proofed

self-controlled heating against ice or snow coverage of housing (min. 24 V DC)

Housing material

powder-coated aluminium housing

Protection class

IP65, resistant to salt spray

Environmental conditions


Temperature range

-40 ... +70 °C


0 ... 100 % rel. air humidity

Dimensions (HxWxD)

670 x 600 x 114 mm

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