The water flow sensor is a device that controls the pressure inside the water supply system. It is connected to the pumps through the nozzles. The main parameters of the devices should include not only the limiting pressure, but also the output voltage. Also, manufacturers indicate throughput without fail. To date, there are many types of modifications. To understand the issue in more detail, it is worth first of all to study the device of the water flow sensor.
Device model
A standard water flow sensor circuit includes a relay and a set of plates. Inside the modification there is a wide camera. The flask is always stationary. Inside it is a small float. The output has a feed channel. Many modifications are made with an adjusting tap, which is installed at the outlet. Valve models are equipped with movable type fittings. For their work involved magnetic force.
Sensor: do it yourself
Making a water flow sensor with your own hands is quite simple. First of all, it is recommended to do the installation of the camera. A small plastic container is suitable for this. Then you have to cut three plates that are installed in a horizontal position. As a result, the flask should not come into contact with them. If we consider a simple model, then one float is enough. It is more expedient to install the union on two adapters. The valve must withstand a pressure of at least 5 Pa.
Types of modifications
By design, only relay and choke devices are distinguished. Additionally, the separation of modifications is carried out according to the pressure level. In a separate subcategory, devices for circulating pumps are highlighted.
Relay models
The water flow switch for a gas boiler is suitable for small pumps. As a rule, models are produced with a single camera. Many experts say that they have low conductivity. However, it is worth noting that there are devices with a vertical arrangement of plates. The maximum pressure in them is at least 5 Pa. Protection systems are quite often used by the P48 series. All this suggests that water leaks are rarely observed. Modifications are characterized by excellent stability. Their suction power is at least 3 N. Very rarely, taps are found in models.
Fitting devices
The most common devices for pumps are considered fitting modifications, which are made with a single chamber. The plates they are usually located in a horizontal position. Some modifications are equipped with two valves. And the parameter of the ultimate pressure is approximately 5 Pa. Protection systems are often used class P58. In this case, the conductivity depends on the size of the nozzle. Some modifications can boast a high pumping speed. Compounds they are quite common threaded type. Also on the market are sensors on clamps, which are not very popular.
Low pressure devices
Low pressure versions are well suited for centrifugal pumps up to 4 kW. Their conductivity depends on the size of the camera. The most common water flow sensor on the market for a two-float pump. Moreover, the average pumping force is 5 N. Protection systems are used in different classes. Many sensors are mounted through pads. Output contacts are designed for wire adapters. It is also worth noting that there are many inexpensive models on the market.
High Pressure Modifications
High pressure models are typically manufactured with one elongated fitting. The plates on the water flow sensor for the pump are most often installed in a horizontal position. If you believe the reviews of experts, the models are great for centrifugal pumps. When choosing a modification, it is important to pay attention to the bandwidth of the devices. The dimensions of the devices are also taken into account. Many models are made with two cameras. However, they only use one valve. If we consider the standard model, then the maximum pressure on average is not more than 6 Pa. The protection system in the devices is used in class P70. It is very rare to find models with a crane. Basically, conventional switches are installed.
Circulation Pump Devices
Sensors for circulation pumps are very popular. A distinctive feature of the modifications is low reducibility. The ultimate pressure averages 3.3 Pa. Security systems are used in a wide variety of classes. Very rarely there are devices on two cameras. When choosing a model, it is important to pay attention to the shape of the fitting. It should have a wide head and a narrow channel. Otherwise, leaks will often occur. Additionally, it is worth noting that float devices are on the market. Their contacts are designed for adapters.
Features of models on two cameras
Sensors for two chambers, as a rule, are distinguished by large dimensions and a high pressure parameter. There are many two valve models on the market. They have a suction force of 4 N. Protection systems are used in the P88 series. Sensor plates are always installed horizontally. If we talk about the shortcomings of the devices, it is important to note that they use very large output channels. For pumps with power up to 8 kW, models are not unique. There are devices on the market with and without cranes. Additionally, there are modifications based on contactor switches.
Three Camera Devices
Three-chamber sensors are connected for centrifugal pumps. The ultimate compression force is very high. It is also worth noting that the models are produced with short channels. Their valves are used rotary type. They are protected by a special membrane. According to experts, the conductivity depends on the size of the camera. If we talk about designs, it is worth noting that there are models on the market with elongated fittings. They have extremely low suction power. However, they can last a long time. Devices with switches are very rare in stores. Typically, models with three cameras are made with small taps.
Models for low power pumps
The water flow sensor for low power pumps should be selected only among the fitting modifications. The ultimate pressure indicator should be about 5 Pa. Protection system is welcomed class P48. Many experts praise devices based on two cameras. Their suction power is approximately 4 N. Relay modifications for low power pumps are not suitable in the best way.
Modifications with vertical arrangement of plates
Devices of this type perform well on centrifugal pumps. They have good conductivity and no problems with high blood pressure. However, do not forget about the flaws of the modifications. First of all, their channel is often clogged. If we consider an inexpensive water flow sensor, then it may have problems with the valve. For normal operation of the system, it is more advisable to select devices with output contacts of 12 V. The protection system should be installed in class P55. Experts also say that the water flow sensor should be with a contactor switch.
Devices with a horizontal arrangement of plates
The water flow sensor for this type of boiler is suitable for a wide variety of pumps. The conductivity of the models depends on the dimensions of the camera itself, as well as the channel. Additionally, the diameter of the fitting is taken into account. Many experts recommend installing dual-chamber modifications. The pumping force from them, as a rule, does not fall below 5 N. The protection system is often used by the P50 series. All this suggests that the manufacturer guarantees a high degree of sealing and overall reliability.
When choosing a device, it is important to evaluate valve parameters. If it is made of ordinary plastic, then it is not able to last long. Copper counterparts show themselves well, but are expensive. The main bulb of the sensors is made of plastic. Modifications with transition contacts are very rare. Relay modifications are able to boast of high conductivity. They are not afraid of overloads. And they use quality protection systems.