LSI LASTEM proposes the necessary equipment to divide the first rain from the following rain to support the realization of the “first rain” plants. The legislation provides that for some types of sites, there is a management of rainwater and washing of external areas for which there is, in relation to the activities carried out, a risk of pollutant run-off.
In particular, it is envisaged that a certain amount of water used for cleaning or rainfall on potentially polluted surfaces should not be released directly into the sewer system, but must first be accumulated in so-called “first rain” tanks and disposed of in the centralized treatment plant or treated in advance.
For first rainwater the first 5 mm are considered of water evenly distributed over the entire draining surface rained over a certain period of time.
When the 5 mm of rain is reached, the “further rain” phase begins. If the precipitation stops, before reaching 5 mm, after a programmed period, the “no rain” condition is passed.
The start of precipitation is signaled by the DGP020 instrument which opens the contact until the cumulative 5 mm is reached, or upon the cessation of precipitation within the programmed period, when the contact is closed.
- Complete detector / Intervention system, rain gauge and containment, feeding and fixing accessories;
- Implementation of a contact (relay 1 A 250 V) depending on the state of precipitation: no rain, first rain, further rain;
- Programming of rainfall event durations and amount of rainfall that determine precipitation states;
- Indication of precipitation intensity;
- Display for programming and for displaying the current status, including precipitation intensity;
- Status indication LED;
- Rain gauge according to WMO standard.
