HELLMANN Automatic Rainfall Recorder

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26.000.000,-

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The precipitation is measured with rain gauges according to Hellmann that have a standardized WMO collection area of 200 cm² . It is measured 1.0 or 1.5 m above the ground ( FAO and WMO guideline) and read out once per day. Wind/ rain must not be interfered by adjacent buildings and trees. The minimum distance between the rain gauge recorder and buildings or trees is equal to their height.

The rain gauge recorder according to Hellmann has a standard funnel of 200 cm² ( WMO guideline) . The collected precipitation flows over a pipe into a container that is equipped with a siphon. Every time the precipitation reaches 10 mm, the self-activated mechanism tips the collected precipitation into a container. A continuously working recorder writes down the precipitation amount.

The recording rain gauge according to Hellmann records the precipitation continuously on graph paper for a duration of up to one month, and it is therefore suitable for remote areas where a daily reading is not possible. A further advantage of the continuous record is the possibility to determine the precipitation intensity ( mm/ min) on the basis of the rise of the curve.
Units
mm/ min; mm/ h; mm/ month; mm/ a;
l/ ( s x ha) ;
Analysis
Isohytes for monthly and annual precipitation
Monthly and annual precipitation
Interval of recurrence of precipitation / depth of precipitation and duration
Precipitation hydrograph, cumulative polygon of precipitation

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