Comparison GARDENA T 380 8205-29 vs GARDENA OS 140‎ 8220-29

— Static. The simplest type of sprinklers: devices that do not have external moving parts and supply water flow in only one, initially specified direction (or in all directions at once). However some models may provide a change in direction and/or mode of operation; however, this is done by manual switching and not by "programmed" operation. And the adjustment of the irrigation range is most often provided by changing the water pressure at the inlet. The main advantages of static models are extreme simplicity and low cost. Among the shortcomings, in addition to limited capabilities, it is worth noting the increased requirements for water purity: it is advisable to connect a static sprinkler through a filter (or make sure there is a built-in filter), otherwise the nozzle may become clogged with debris that has entered the water.

— Spinner. The simplest type of rotary sprinklers : watering is carried out using a continuous jet beating from a rotating nozzle (in many models, the rotating head has several nozzles). The nozzle describes a full circle during operation, the design does not provide adjustment of the irrigation angle, and in general, the turntables are quite simple and unpretentious in terms of functionality: for example, the irrigation range is usually regulated by changing the pressure. On the other hand, such models are simple, reliable and provide fairly uniform watering. In general, t...his option (also called "circle sprinklers") is well suited for round areas, such as flower beds.

— Pulse. In accordance with the name, this type of sprinkler does not supply water in a continuous stream, but in separate pulses. Due to this, such devices are less sensitive to contaminants in the water than models with a continuous water supply (for example, turntables — see above). However, the main advantage is that in this way it is possible to provide a high irrigation range and, accordingly, a large area coverage; it is these devices that are considered most suitable for large spaces such as stadiums, golf courses, etc. At the same time, pulse sprinklers are most often quite advanced devices with a high degree of automation. For example, most models have adjustable irrigation angle, and the distance changes automatically during operation: first, the farthest part of the treated sector is watered, then the jet gradually moves closer and closer to the sprinkler. The main disadvantage of impulse models is their rather high cost.

— Oscillating. A type of sprinkler, originally designed for rectangular areas; also known as "pendulum". The working element of such a device is a horizontal tube with holes through which water enters. The tube during operation rotates back and forth around the longitudinal axis, due to which the water is evenly distributed over a rectangular area. Many models allow you to adjust the angle of rotation, thus changing the size of the irrigation spot.

— Microdroplet. Sprinklers designed for use in drip irrigation systems — when water is not sprayed “over the areas”, but is supplied “addressally”, under the roots of each individual plant. Such systems are quite complex and expensive, but extremely efficient and economical; they perform particularly well in arid regions where water conservation is an urgent need. The micro-drop sprinklers themselves, in accordance with their purpose, are small in size and have low productivity (and the latter in this case is not a disadvantage, but a necessary condition for normal operation).

— Turbo sprinkler. Turbo sprinklers are quite advanced devices with high productivity and irrigation range, usually having a rotary design with the ability to adjust the spraying range and angle. The jet in turbo sprinklers, unlike impulse models, is solid, thanks to which such devices operate noticeably quieter (which is important, for example, in the private sector). At the same time, various tricks are used in the design that improve the uniformity and overall quality of irrigation — for example, a divider for "spraying" water. Turbo sprinklers are worth paying attention to, first of all, if you plan to regularly water fairly large areas.

— Contour. The name of this variety of sprinklers is due to the fact that they are able to provide irrigation within the area with given contours. This can be very useful on irregularly shaped lawns — the device can be programmed to spray the entire area without leaving unwatered places and at the same time not entering garden paths and other places that do not require irrigation. The main disadvantage of such models is that such "smart" irrigation requires complex electronics, which is very expensive. For this reason, contour models are relatively rare on the market.

— Micro sprinkler. The simplest sprinklers, which are, in accordance with the name, small in size and, usually, are not equipped with their own mounting brackets (see below). Irrigation capabilities in such models are very limited — for example, the range usually does not exceed 3 m; and any "bells and whistles" like pulse mode, angle adjustment, etc. not included in the design. The main application of micro-sprinklers is small areas, indoor complexes like greenhouses or greenhouses, as well as automatic systems with several sprinklers.

The number of spray modes provided in the design of the sprinkler.

Different spray modes provide different jet parameters — for example, in one mode, water is supplied in a continuous stream, in another it expands and breaks into smaller drops, in the third it is sprayed almost to a fog state. The more such options, the more versatile the sprinkler, the easier it is to configure it for a specific situation. On the other hand, an increase in the number of modes complicates and increases the cost of the design (although much depends on the implementation features: for example, an inexpensive rotary nozzle with different types of holes can be used for switching).

The number of individual nozzles (nozzles) provided for in the design of the sprinkler. This number corresponds to the number of jets that the device is capable of delivering at the same time.

Theoretically, the more jets, the thinner they are and the more evenly the water is sprayed. However, in fact, this indicator by itself has practically no effect on irrigation efficiency: for example, a single nozzle of a properly selected design may not be inferior in efficiency to a set of several nozzles. Therefore, when choosing, it is worth focus not so much on the number of nozzles, but on other practical characteristics and features of the jet (the latter can be clarified, for example, from video reviews). We only note that oscillating sprinklers(see "Type"), by definition, are equipped with a set of several nozzles (up to 25 – 28).

The irrigation width provided by the sprinkler, to be more precise, the width of the area covered by the device at a time, without turning the nozzles horizontally.

This parameter is relevant primarily for oscillating models (see "Type") — they evenly capture a rectangular space, and the width is one of the main dimensions for a rectangle. In other types of sprinklers, we are talking about the width of the jet at maximum range (because the jet expands as it moves away from the nozzle); however, for such models, it is more convenient to indicate the size of the captured space by the angle of irrigation (see above), and the width for them is rarely indicated.

The maximum range that the sprinkler can provide.

The choice for this parameter depends primarily on the size of the area to be covered. However, keep in mind that a high range usually requires fairly high pressure and can degrade watering efficiency close to the nozzles. Therefore, even in large areas, it is sometimes more convenient to use a system of several sprinklers with a short range, rather than a long-range device.

The largest area that the sprinkler can cover during operation (or the standard coverage area for models that do not allow changing the size of the captured area).

The larger the area, the more watering area it may require. At the same time, the irrigation system must correspond not only to the area, but also to the shape of the site. Therefore, a model covering a large area is not always the best choice — sometimes (especially in areas of complex shape) it is easier to cover the required space with a few relatively modest sprinklers.

In some cases, knowing the irrigation area, you can determine other characteristics of the device: for example, for a sprinkler with an irrigation angle of 360 °, you can calculate the maximum range without much difficulty, even if it is not indicated in the characteristics.

The pressure of the water in the connected hose/pipe that the sprinkler is designed to handle: lower pressure will not give the device the required performance, higher pressure may cause damage. And even if too high pressure did not lead to an "accident" immediately, it can happen at any time. Therefore, this parameter should never be ignored.

The best option is considered to be the situation when the pressure in the hose is slightly (by 0.4 — 0.5 bar) does not reach the claimed maximum — this allows you to fully realize all the capabilities of the sprinkler and at the same time gives a guarantee against breakage in case of pressure surges.

The diameter of the hose (or pipeline) that the sprinkler is designed to connect to, in other words, the diameter of the mounting thread provided in the device. This parameter allows you to determine compatibility with a specific hose: if the mounting diameters do not match, you will not be able to connect the sprinkler directly, you will need an adapter.

Hose diameters are traditionally indicated in inches — for example, 3/4" or 1.5".