See blog post: Solenoid valves ā which ones are there and how do they differ? Fixed or flexibly expandable number of valve connections The battery-operated watering computers do not work with the normal 24 volt solenoid valves, but with 9 volt solenoid valves. Hunter, Rain Bird and Orbit also offer battery-operated models in their range, Hunter also has a hybrid model that can be operated with both batteries and electricity. Irrigation computers for valve control are usually powered by electricity, which means you need a connection to the power grid to be able to operate the computer. With Hunter and Rain Bird, the indoor models can be recognized by an āiā in the type designation. In outdoor models, the transformer is housed in the irrigation computer, in indoor models it hangs outside. The former are a cheaper alternative if you can mount the computer in the basement or technical room, for example, otherwise you need the wind and weather-protected outdoor model in any case. Irrigation computers are offered that are only suitable for indoor use and those that can be used outdoors. In addition, there are a handful of other fundamental differences that also explain the large number of different irrigation computer models and types from the major suppliers like Hunter, Rain Bird, Orbit or Racchio. The number of valves that can be connected and thus the number of irrigation sectors that are possible with the computer is the basic key figure when selecting the computer. Another type of irrigation computer, in which the valve is permanently integrated in the irrigation computer and the water flows through, is dealt with in a second blog post of sprinkler timers. In the professional sector, this type of irrigation computer is used almost exclusively. Because the black phase cables are bundled in a community cable and therefore they always need exactly one connection option, regardless of the number. Although two cables lead from each solenoid valve to connect to the irrigation computer, each additional valve only requires one additional connection option in the irrigation computer. In principle, these can be imagined as electrical junction boxes, except that the cables are not connected here for a circuit, but for the switching of solenoid valves. Only those computers that are required to control solenoid valves are dealt with here. The most important models available on the market are presented and explained what distinguishes them from one another and what criteria to look out for when buying such a computer. This article is about irrigation computers for controlling solenoid valves.
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