Pump water flow sensor for a gas boiler: circuit, device

The water flow sensor is a device that regulates 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 ultimate pressure, but also the output voltage. Also manufacturers specify mandatory bandwidth. To date, there are many types of modifications. In order to understand the issue in more detail, it is first of all to study the device of the water flow sensor.

Device model

The standard water flow sensor circuit includes a relay and a set of plates. Inside the modification there is a wide camera. The bulb is always stationary. Inside it is a small float. There is a make-up channel on the output. Many modifications are made with an adjustment tap, which is installed at the outlet. Models with valves are equipped with movable type fittings. For their work, the magnetic force is involved.

Sensor: do it yourself

Making a water flow sensor with your own hands is quite simple. First of all, it is recommended to start installing the camera. For this, a small plastic container is suitable. Then you have to cut three plates, which are installed in a horizontal position. The bulb as a result should not come into contact with them. If we consider a simple model, then one float will suffice. It is more advisable to install the adapter 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 allocated. Additionally, the modifications are divided according to the level of pressure. Devices for circulating pumps are highlighted in a separate subcategory.

Relay Models

The water flow sensor for the gas boiler is suitable for low-power pumps. As a rule, models are produced with one camera. Many experts say that they have low conductivity. However, it should be noted that there are devices with a vertical arrangement of plates. The limiting pressure at them is equal not less than 5 Pa. Protection systems are often used series P48. All this suggests that water leaks are rarely observed. Modifications are characterized by excellent stability of operation. The suction force at them equals not less than 3 N. Very rarely, models have craters.

Tightening devices

The most common devices for pumps are choke modifications, which are made with one camera. Plates in them, as a rule, are located in a horizontal position. Some modifications are equipped with two valves. And the parameter of limiting pressure at them is equal approximately 5 Pa. Protection systems are often used in the P58 class. In this case, the conductivity depends on the dimensions of the nozzle. Some modifications can boast of high pumping speed. The connections are quite often found in the threaded type. Also on the market are sensors on the clamps, which are not very popular.

Low-pressure devices

Modifications of low pressure are well suited for centrifugal pumps up to 4 kW. Conductivity in them depends on the size of the camera. Most often in the market there is a water flow sensor for a pump for two floats. At the same time, the pumping force is on average 5 N. The protection systems are used in different classes. Many sensors are installed through the lining. Output contacts are designed for wire adapters. Also worth noting that the market has many inexpensive models.

Modifications of high pressure

Models of high pressure, as a rule, are produced with one elongated nozzle. Plates for 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. Also the dimensions of the devices are taken into account. Many models are made with two cameras. However, they only have one valve. If we consider the standard model, then the average pressure is not more than 6 Pa. The protection system in devices is of the class P70. It is very rare to find models with a crane. Basically, the usual switches are installed.

Circulating pump devices

Sensors for circulation pumps are very much in demand. A distinctive feature of the modifications is low reducibility. The limiting pressure on average is 3.3 Pa. Protection systems are used in a variety of classes. Very rarely there are devices for two cameras. When choosing a model, it is important to pay attention to the shape of the nozzle. It should have a wide head and a narrow channel. Otherwise, leaks will often occur. In addition, it is worth noting that the market presents devices on floats. Contacts for them are designed for adapters.

Features of models for two cameras

Sensors for two chambers, as a rule, are distinguished by large dimensions and a high pressure parameter. There are many models on the market for two valves. They have a suction force of 4 N. The protection systems are applied in series P88. Plates at the sensors are always installed in a horizontal position. If we talk about the shortcomings of devices, it is important to note that they use very large channels at the output. For pumps with a power of up to 8 kW, the models are not uniquely suited. In the market there are devices with cranes and without them. Additionally, there are modifications based on contactor switches.

Devices for three cameras

Sensors for three cameras are connected to centrifugal pumps. The limiting compression force is very high. It is also worth noting that the models are made with short channels. Valves at them are applied rotary type. They are protected by a special membrane. If you believe the experts, the conductivity depends on the size of the camera. If we talk about the design, it is worth noting that in the market there are models with oblong fittings. They have an extremely low suction force. However, they can last a long time. In shops, devices with switches are very rare. As a rule, models for three cameras are produced with small cranes.

Models for low-power pumps

The water flow sensor for low-power pumps should only be selected among choke modifications. The indicator of the limiting pressure should be about 5 Pa. The protection system is welcomed by the P48 class. Many experts praise devices based on two cameras. They have a suction force of about 4 N. Relay modifications for pumps of low power are not suitable.

Modifications with vertical arrangement of plates

Devices of this type show themselves well at centrifugal pumps. They have good conductivity and there are no problems with increased pressure. However, do not forget about the shortcomings of the modifications. First of all, they often clog the channel. 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 appropriate to select devices with 12 V output contacts. The protection system must be installed in class P55. Still experts 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. Conductivity in models depends on the dimensions of the camera itself, as well as the channel. Additionally, the diameter of the union is taken into account. Many experts recommend installing two-chamber modifications. The pumping power in them, as a rule, does not drop below the 5N mark. The P50 series is often used for the protection system. All this shows that the manufacturer guarantees a high degree of sealing and overall reliability.

When choosing a device, it is important to evaluate the valve parameters. If it is made of ordinary plastic, it can not last long. Copper analogues show themselves well, but they are expensive. The main bulb of the sensors is made of plastic. Very rarely there are modifications with transient contacts. Relay modifications can boast of high conductivity. They are not afraid of overloading. And they use high-quality protection systems.