Installing the groove sensor for hot water. Water duct sensors for gas boilers and pumps. Installation and manufacture with your own hands

Now we will understand why the water flow sensor is needed (they call the "Relay of Duch") and look at the principle of its work. Also you will learn what kinds of these sensors and how to install it yourself.

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In everyday life sometimes happens emergency inclusion The pump without water, which can lead to equipment breakdown. Due to the so-called "dry stroke", the engine overheats and the parts are deformed. In order for the pump functioning with maximum efficiency, it is important to ensure water supply without interruptions. To do this, equip the heating system and hot water supply with such a device as a water flow sensor.

Water Drift Sensor

Device and principle of operation

The water flow sensor is a device that monitors the pressure inside the water supply system, it is connected to the pump by means of pipes.

Standard water flow sensor diagram:

relay;
set of plates;
inside the device there is a wide chamber;
float small sizewhich is placed inside the fixed flask;
channel feeding at the exit;
most models are equipped with an adjustable crane installed at the output.

Principle of the sensor: when there is no fluid flow, it automatically suspends pump station And it does not allow "dry go", and when water appears, it starts the device.

Application area

Water duct sensors are usually found in devices where it is necessary to continuously monitor life support system and comply with a certain mode of their work.

Most often, water duct sensors are used in boilers operating on gas. Modern gas boilers equipped with such sensors are used both for heating and water heating.

The device that is on the feed pipeline water water When water entered, the signal is sent to the boiler control and operation. circulating pump stops. Then the board includes nozzles responsible for heating flowing water, and water in the heat exchanger begins to heat up. When the crane is closed, the sensor notifies that the water supply is suspended.

Most of the households are equipped with autonomous water supply systems, thanks to which you can have the most comfortable conditions.

The water flow sensor function is that when you turn on any of the devices connected to the water supply system, the sensor turns on the pump and water begins to flow.

Choosing a water duct sensor, be sure to consider throughput devices and their size.

Types of water flow sensors

By type of construction, relay and fitting devices are distinguished. In addition, variations are distinguished by pressure level.

Relay type water duct sensor Used for pumps with not high power. Usually these models are single-chamber. Specialists note their low conductivity. Models are produced with a vertical location of the plates, their maximum pressure is at least 5 pa.

Protection systems are often used by the P48 series. Thanks to all these indicators, water leaks almost does not happen, also similar devices are characterized by good stability.

The most widely used water duct sensors for pumps - equipment models. The plates are usually placed horizontally, separate samples are equipped with two valves. The maximum pressure of them is approximately 5 pa. Protection systems most often class P58. The conductivity is in direct dependence on the size of the fitting.

Sensors low pressure Applicable pumps with power no more than 4 kW. The size of the chamber affects conductivity. Most often in the market, you can find the water flow sensor for the pump for two floors. Their price is low and easily you can choose the desired model.

High pressure models are usually produced with one elongated fitting, the plates are mounted horizontally. Experts advise to establish such samples into centrifugal pumps. Maximum pressure - does not exceed 6 Pa, Class P70 protection system.

Also, the action mechanism is divided into:

water sensor based on the principle of the Hall sensor: signals not only about the water duct, but also about the feed rate;
the germ sensor acting according to the principle of the magnet: inside it is located a magnetic float, which, as water pressure grows, it moves through the chamber and has an impact on the German.

Device and principle of operation of the generic water flow sensor

Installation and manufacture with your own hands

Most of the water flow sensors are in the design of the devices, so it is required to produce their installation solely in the event of a breakdown and need to replace. However, there are cases when the water duct sensor must be installed separately, for example, if necessary, an increase in water supply pressure. This is due to the fact that in the system of the central water supply system, the pressure is low and does not reach the norm. And in order to turn on the gas boiler in the hot water regime, you need a good pressure.

In such situations auxiliary circulation pumpwhich is equipped with a water duct sensor. First, the pump is mounted, and after the sensor. It follows that as soon as the water starts to flow, the sensor will turn on the pump and the pressure will begin to increase.

Pressure Enhancement Pump For System water supply Grundfos. UPA 15-90 with built-in water duct sensor

Make a water flow sensor with your own hands is not difficult. First you need to install the chamber, then you need to cut three plates, it should be mounted horizontally, there should be no contact between them and the flask. For a simple design, one float will be enough.

The fitting is rational to install on two adapters, the valve must withstand the pressure of at least 5 pa.

Manufacturers

Manufacturer	Characteristic
Water flow sensor for grundfos pump UPA 120 (Denmark)	Designed to ensure water supply individual house, Apartments equipped with an individual water supply system. The inclusion of the sensor automation occurs at a stable fluid flow in the range of 90-120 liters per hour. The main function - the pump protection from idle move. The launch of the pump is performed at a 1.5 liter water consumption per minute. Operating voltage of the sensor - 220-240 V. Maximum current consumed - 8 A. Power consumption - up to 2.2 kW. Degree of protection - IP 65. Price - about 1,800 rubles.
Genyo Water Drift Sensor - Lowara Genyo 8A (Poland)	Used to control the pump household water supply system based on the actual water consumption. The main feature of the sensor is to control the pressure in the plumbing during operation. The launch of the pump is performed at a 1.5 liter water consumption per minute. Operating voltage - 220-240 V. Current frequency - 50-60 Hz. Maximum current consumed - 8a. Power consumption - up to 2.4 kW. Range of operating temperatures - 5-60 degrees Celsius. Degree of protection - IP 65. Price - about 1,800 rubles.
Duch Sensor 1.028570 (Italy)	Designed for installation in the gas double-circuit boilers of the brand immergas. Compatible with models: Mini 24 3 E, VICTRIX 26, MAJOR EOLO 24 4E \| 28 4e. Designed for installation in gas bolery trademark Immergaz chimney and turbocharged versions. Made in a plastic housing with a threaded connection. The Hall Sensor 1.028570 allows you to receive water from the stable temperature at the output from the contour of the hot water supply. Price - approximately 2,400 rubles.

Thus, the water flow sensor is designed to secure the work of the boilers and pumping equipment.

The introduction of water flow sensor for the boiler to the heating and hot water supply system allows you to protect communication from such a phenomenon as a "dry course". So specialists call emergency activation of the pump in conditions when there is no water in the diagram, the likelipatibility of engine overheating and the failure of bonding components is large.

Water flow sensor for gas boiler It is a device combined with a pump through nozzles, it controls pressure indicators in the water supply system. IN standard complete set The node under consideration includes:

relay;
wide internal chamber;
output channel feeding;
set of plates;
compact float inserted into a fixed flask;
small adjustable cranemounted at the exit.

The sensor acts as follows: if the system does not flow the working fluid in the system, the device automatically turns off the pumping station so that the scheme does not work on the "dry run" when water appears, the aggregates are started again.

Through the pipe, the liquid falls into the apparatus, on its inner wall Provided petal or valve. The germ switch is isolated from other components, it is responsible for the connection with the power supply. Also in the design includes various-caliber springs.

When water is affected on the valve, it shifts relative to its axis, and the magnet, which is opposed, is approaching the switch. A similar movement causes a contact closer, the pump is connected as a result. When the fluid flow is stopped when the pressure is reduced, due to the weakening compression, the valve returns to its original position. Manit shifts, contact is disconnected, the pump stops working.

Devices that follow the flow of water are often embedded in schemes in need of constant and comprehensive tracking of life support system indicators, equipment operating in complex automatic mode. Usually, such a sensor is used in a tandem with a gas boiler and pump, improved ligaments are equally effective for hot water supply, and for heating in the private sector.

The duct sensor is installed on the pipeline through which the liquid is supplied from the water pipeline. When water enters the system, the device sends a signal received by the boiler board, as a result, the functioning of the circulation pump is suspended. The boiler control board activates the nozzles that ensure the preheating of flow water, due to which the temperature of the fluid in the heat exchanger begins to rise. When closing the crane, the sensor is noting the system of stopping the water supply.

Modern communication systems are based on autonomous water supply - In this case, the most comfortable living conditions are created. Here, the entire functionality of the duct sensor is reduced to the fact that when activating any of the devices embedded in the water supply system, the pump is connected and water flows. Therefore, when choosing a model, it is important to take into account its size and bandwidth.

Varieties of model range

By type of execution, the nodes are classified for fitting and relay, they are also typified by the operating pressure indicator.

Relay devices are installed on pumps that do not have high power. As a rule, relay sensors serve as a rational addition of single-chamber devices. Experts warn that this device class shows low conductivity. The profile market there are models characterized by vertical placement of plates. The upper limit of their working pressure is 5 pa. IN protective systems Representatives of the P48 series are often introduced, they minimize the probability of leaks, attract stability and reliable work.

Widespread fitting devices, functionally complementary pumps. They can be distinguished by characteristic horizontal placement Plates, in samples with improved technology, you can see two valves. Here, the maximum pressure in the system should not exceed 5 pa, but the protection class differs from the previous version - P58. The level of progress of the node is directly dependent on the dimensions of the fitting.

If you consider the device's response mechanism, you can use one of two scenarios:

the model operating on the principle of the Hall sensor - it gives signals both about the presence of water flow and the parameters of its feed (that is, speeds);
the generic sensors are triggered by the principle of magnet - there is a magnetic float in their body, it commensurately increasing the pressure of the fluid moves along the inner cavity, thereby influenced the location of Herron.

Low pressure devices are rational for installation on pumps, the power of which does not exceed 4 kW. The parameters of the chamber have a direct impact on the degree of maintenance of the device. The profile market is filled with two float models of sensors on pumps. A rich assortment range and loyal cost contribute to their universal use.

In the design of high-pressure devices, a single extended fitting is provided, plates are placed in a horizontal direction. It is recommended to use similar samples in a tandem with centrifugal pumps. It provides for the Protection Class P70, the maximum pressure mark is at the level of 6 pa.

Criteria for selecting the device

electricity consumption level;
maximum pressure;
priority method of mounting boiler, pump, directly sensor;
the range of mosquito equipment, which does not hurt the boiler performance;
requirements for the quality of the transmitted water;
device performance.

On the labeling of nodes, models are usually indicated full characteristics Equipment, in tandem with which a specific device will fully function. The cost of products have influence such factors such as body material, type of fixation, weight, power consumption and working pressure.

Strengths of aggregates:

simple installation - installation can be carried out on your own;
the ability to coordinate all the parameters of the flow of water or working fluid;
the ability to automatically turn off the pump when an emergency situation occurs;
a rich assortment and flexible price range.

When choosing, it should be borne in mind that when weakening the springs, the correctness of the node will be questioned. Not in each heating system You can implement a similar component, here you need to delve into the specification.

Review of products of the best manufacturers

Companies whose range includes double-circuit boilers, offer users highly specialized users optional equipment, among which a special niche occupy a protrusion sensors.

Products of the Concern Electrolux are combined with the series GCB 24 x FI and GCB 24 XI, their weight is only 150 g, the maximum working pressure is 1.5 Pa. Dimensions of devices are compact - 40x115x45 mm, the pressure range does not exceed 3 bar, the upper mark of the permissible humidity of the medium is 70%.

Viessmann Vitopend WH1D.

The Wisman duct sensor is installed in the gas boiler on the left side of the hydroblock. This element is necessary to control the parameters and productivity of the hot water flow. The model is designed for Vitopend and Vitopend 100 series.

Ariston Genus Clas B 24

Sensor Genot ARIRISON is necessary for coordinating water heating by a gas boiler. Under the exchange rate email The latter is received, as a result, the equipment goes into operation mode. A magnetic float is concluded into the composite plastic housing, it affects the gercon of which the contacts of which are closed (the boiler starts to produce hot water) or open (heating is provided).

Grundfos Upa 120.

The device protects the pump from idling, is introduced into the system of individual water supply. The automation functionality needs to ensure a stable fluid flow of at least 90-120 l / h. The instrument protection class - IP65, the power consumption of this budget model does not exceed 2.2 kW. The borders of the operating temperatures are kept in the positive range - from 5 to 60 ° C, 8 A is the maximum current consumed.

Universally applied in household systems Water supply, the basis for its activity is the actual water consumption. The sensor is able to track the pressure level in the plumbing. The pump starts only when the empty water consumption will reach 1.5 liters. The degree of protection of the unit - IP65, the operating voltage is used in the range of 220-240 V. The power consumption is kept at a 2.4 kW mark.

Immergas 1.028570.

Initially, the model was designed for use with the boilers of the brand of the same name, it is compatible with a two-door gas equipment Series Victrix 26, Mini 24 3 E, Major Eolo 24 4e. The device is permissible to use with boilers of turbocharged and chimney versions. The sensor is enclosed in a plastic case, equipped with a threaded element for introducing into the system. An additional option is the possibility of obtaining hot water having a stable temperature.

A significant segment of water duct sensors for the boiler is supplied with heating equipmentTherefore, the need for their installation occurs only in the event of a breakdown, the code has to think about a commensurate replacement. A rare case when a separate installation of the device is planned - the need to increase the pressure of the fluid being supplied to the system. Such a situation occurs if the central water supply is characterized by low pressure, barely reaching the needs of the boiler. To gas device It was capable of providing proper quality of hot water, it should deal with good pressure.

To solve this problem, an additional circulation pump is mounted and equipped with a water flow sensor (the introduction of components into the system should be made in this order). With the beginning of the water intake, the device activates the operation of the pump, which leads to an increase in pressure.

Homemade models are made from the chamber, which will be used together with three plates installed horizontally. It is important that the latter cannot be contacted between themselves and do not touch the flasks.

For the simplest modifications, it is enough to introduce one float. The fitting should be mounted in a tandem with two adapters, the maximum allowable valve pressure is 5 Pa.

The water duct sensor is a device that adjusts the pressure inside the water supply system. It connects to pumps through nozzles. The main parameters of the fixtures should include not only the limit pressure, but also the output voltage. Also manufacturers indicate obligatory bandwidth. To date, there are many types of modifications. In order to figure out in more detail on the question, it is primarily to explore the device of the water flow sensor.

Device model

The standard water flow sensor diagram includes a relay and a set of plates. Inside the modification there is a wide camera. The flask is always in a fixed state. Inside it is a small float. The output there is a feeding channel. Many modifications are made with adjustable crane, which is installed at the output. Models with valves are equipped with moving type fittings. Magnetic power is involved for their work.

Sensor: do it yourself

Make a water flow sensor with your own hands is quite simple. First of all, it is recommended to do the installation of the camera. For this, a small plastic container is suitable. Then you will have to cut three plates that are installed in a horizontal position. The flask in the end should not touch them. If we consider simple model, I'll have one float. The fitting is expedient to install on two adapters. The valve must withstand the pressure of at least 5 pa.

Types of modifications

On design, only relay and fitting devices are distinguished. Additionally, the separation of modifications is carried out in terms of pressure. In a separate subcategory, devices for circulation pumps are isolated.

Relay models

Relay water flow sensor for gas boiler is suitable for low power pumps. As a rule, models are made with one chamber. Many experts suggest that they have low conductivity. However, it is worth noting that there are devices with a vertical location of the plates. The limit pressure is equal to at least 5 pa. Protection systems are quite commonly used series P48. All this suggests that water leaks are rarely observed. Modifications are characterized by excellent stability. The strength of suction is equal to at least 3 N. Very rarely, the models meet crane.

Equipment

The most common pumps for pumps are indicator modifications that are produced with one chamber. They are usually located in a horizontal position. Some modifications are equipped with two valves. And the parameter of the limit pressure is equal to about 5 pa. Protection systems are quite commonly used class P58. In this case, conductivity depends on the size of the fitting. Some modifications are able to boast high speed pumping. Connections they often have a threaded type. Also on the market presented sensors on clamps that are not very popular.

Low pressure devices

Low pressure modifications are well suited for centrifugal pumps with a capacity of up to 4 kW. Their conductivity depends on the size of the camera. Most often on the market there is a water duct sensor for a pump for two floors. At the same time, the force of pumping on average is 5 N. Protection systems apply to different classes. Many sensors are installed through lining. The output contacts are designed for wired adapters. It is also worth noting that there are many inexpensive models on the market.

High pressure modifications

High pressure models are usually produced with one oblong fitting. The plates on the water duct sensor for the pump are most often installed in a horizontal position. If you believe the reviews of experts, the models are remarkably suitable for centrifugal pumps. When choosing a modification, it is important to pay attention to the bandwidth of the devices. The dimensions are also taken into account. Many models are made with two cameras. However, the valve is used only one. If we consider the standard model, then the limit pressure on average is not more than 6 pa. The protection system in devices is used class P70. It is very rare to meet models with a crane. Mainly set conventional switches.

Devices for circulation pumps

Sensors for circulation pumps are very popular. Distinctive feature Modifications are considered low lifting. The limit pressure on average equals 3.3 pa. Protection systems apply to various classes. Very rarely there are devices for two cameras. When the model is selected, it is important to pay attention to the shape of the fitting. He must have a wide head and a narrow canal. Otherwise, there will often be leaks. Additionally, it is worth noting that the market contains devices on floats. They are designed for adapters.

Features of models for two cameras

The sensors into two chambers are usually highlighted by large dimensions and a high pressure parameter. There are many models on the market for two valves. They have a suction force equals 4 N. Protection systems apply to the R88 series. Plates for sensors are always installed in a horizontal position. If we talk about disadvantages of devices, it is important to note that they use strongly large channels at the exit. For pumps with a capacity of up to 8 kW models are not suitable. There are devices with cranes in the market and without them. Additionally, there are modifications based on contact contactor switches.

Devices for three cameras

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

Models for low-power pumps

The water duct sensor for low power pumps should be selected only among the agricultural modifications. The limit pressure indicator should be about 5 Pa. The protection system is welcomed by class P48. Many experts praise devices on the basis of two cameras. The power of suction is about 4 N. Relay modifications for small power pumps are not suitable.

Modifications with vertical location of plates

Devices of this type well show themselves on centrifugal pumps. They have good conducts and no problems with increased pressure. However, do not forget about the shortcomings of modifications. First of all, the channel is often clogged. If we consider an inexpensive water duct sensor, then it can have a valve problem. For normal operation of the system, it is more expedient to select devices with output contacts to 12 V. The protection system must be installed class P55. Another experts suggest that the water duct sensor must be with the contact switch.

Requirements with horizontal plates arrangement

Water duct sensor for the boiler of this type is suitable for a wide variety of pumps. The conductivity of the models depends on the dimensions of the chamber directly, as well as the channel. Additionally, the diameter of the fitting is taken into account. Many experts recommend installing two-chamber modifications. The power of pumping in them, as a rule, does not fall below the mark of 5 N. The protection system is quite often used by the R50 series. All this suggests that the manufacturer is guaranteed a high degree of sealing and overall reliability.

If the device is selected, it is important to estimate the valve parameters. If it is made and ordinary plastic, it is not capable of listening to a long time. Copper analogs show themselves well, but they are expensive. The main flask in the sensors is made of plastic. Very rarely encounter modifications with transitional contacts. Relay modifications are able to boast high conductivity. They are not afraid of overloads. And they use high-quality protection systems.

The effective operation of pumping equipment is the key to uninterrupted water supply and the functioning of the heating system in a private house. If you want to use the blesses of civilization every day, you must make every effort to correctly set up.

The solution of this problem includes a wide range of works, the main of them is the installation of an additional snap-in, which will help to clearly control possible failures in the system and will prevent the pump output.

Such auxiliary devices such as the thermal sensor, as well as a water flow sensor are most popular and useful. It is about the properties and operational features of the last device will be discussed in this article.

1 Purpose and Use

In everyday life occurs emergency inclusion of the pump without water, which is considered extremely dangerous, because it can cause equipment breakdown. The "dry stroke" named in the people leads to overheating of the engine and deformation of parts.

Similar negative changes There are because water in the system performs a lubricating and cooling function. Functioning in the "dry stroke mode" is not even a short time on the equipment, be it circulating or. To avoid such problems, the pumping station is equipped with automatic - water flow sensor. It will prevent negative changes in the system and will avoid the cost of repairing the pump.

The water flow sensor is a device for managing the pumping station in. In addition, the specified automatic device is used to increase the pressure and protection of the pump, which is used in heating systems.

The principle of the sensor is that it controls the power of the fluid stream and independently includes or turns off the pumping station when the flow of water through it appears. Thus, it is possible to prevent a possible "dry stroke", because the submersible or circulation pump drives the system and raise pressure inside it only when it is required.

Installation of water flow sensor entails a series positive moments In operation of the pumping station:

saving electricity costs;
reducing the risk of equipment breakdown;
increased pump life.

1.1 Design and principle of operation

As it has already become clear, the built-in water duct sensor is used in the circulation systems of heating and water supply of private houses. Its work is that in the absence of fluid flow, automatons stop the pumping station and prevent "dry stroke", and when water appears - to bring equipment into action. Similar working properties sensor received due to its design.

The device consists of a valve ("petal"), which is located in the running part and the generic switch. If the water occurs, the petal valve starts to move, squeezing the spring. At the same time, the magnet on the "petal" and the germ relay comes into interaction.

As a result, the contacts are closed, which drives the submersible or circulation pump. When there is no water and appropriate pressure in the system, the valve spring is squeezed, moving the magnet to its original position - it causes the opening of the contacts and stop the equipment.

Water duct sensor for circulating or submersible pump Easy to mount in a having system, you just need to correctly select the device, paying due attention to key parameters.

1.2 Main characteristics

To buy a water duct sensor for water to be approached. We recommend focusing on the following instrument characteristics:

case material and working components;
operating pressure;
heat carrier temperature range;
operating conditions and security class;
thread diameter.

To understand what effect each of the listed factors affect the operational features of the device, consider them in stages. The material of the case and the working components affect the reliability and durability of the sensor, which is installed on the pump. It is desirable that the instrument is based on the metals: stainless steel, aluminum or brass.

These materials are capable of protecting the working elements from a powerful stream of water and hydraulic impact. Be sure to explore the level of working pressure at which the sensor is capable of functioning. For each circulation pump, this value will be individual, so you need to calculate the appropriate parameter in advance.

There are devices that provide two levels of pump controls: along the lower limit of the system pressure to turn it on and on the upper pressure limit in case of termination or unacceptably low water flow level to turn off the pumping station.

The sensor with the possibility of such programming is considered optimal. It is impossible when choosing a snap-in to control the flow of water to neglect such a parameter as the temperature range of the coolant.

Terms of use of devices can differ significantly. It is one thing if you have to mount the sensor into the heating system, where temperatures can reach 110 ° C and completely different when the pump is used to turn on and supplying cold water.

In the latter case, you can choose a device calculated on the temperature range of 60-80 ° C. In order for the pump and the acquired sensor as long as possible, it is possible to pay attention to which the equipment must function.

In the instructions for the device necessarily indicate the temperature level ambient and security class. The last criterion determines the loads that can withstand the sensor installed in the pump.

For the product of the correct and accurate installation, you will have to pay attention not only to the permissible temperature of the device, but also on the diameter of the connecting thread. Only with the correct and high-quality bump of elements can be achieved efficiently functioning the sensor after its pre-installation and inclusion.

1.3 About the device and characteristics (video)

2 Adjusting and connecting the sensor

The duct sensor, which is used to control the water level and pressure in the system, immediately after purchase should be adjusted. The process occurs as follows: The device comes with open contacts and a tightened calibration screw.

After turning on the pump and the achievement of the optimal water level, the slats shifts in the direction of fluid flow, which leads to the closure of the contacts. If the lamel will not start moving, then this means that this level of water consumption is not enough. In the case when the device does not respond, you need to set another value and should be operated first.

There are a number of rules that will facilitate the installation of a duct sensor, the main thing is to install the instrument should occur on the horizontal pipeline, regardless of the water of which temperature is moving inside. At the same time you need to follow the lamella to be vertically.

You should thoroughly measure the distance between the pipe and the device - the minimum allowable value is 55 mm. Using the threaded coupling, the sensor is connected to the drain pipe, regardless of the water level inside.

The device must be oriented so that the arrows on its body correspond to the direction of water flow in the system. When high level The contamination of the coolant in front of the sensor is mounted.

Sensor of Duch - a device that generates the output signal in the presence of a fluid or gas flow. Installed in pipelines and air ducts, where the presence of a working fluid is a critical parameter.

Such a sensor is also called flow switch,because Its principle of action is similar to with the only difference that its workshop causes no appearance of the control voltage on the coil, but the presence of fluid or gas flow. But the result of the response of the duct sensor, as well as the usual relay, is to change the state of the output contacts to the opposite.

As a rule, the sensor has a normal-closed (NZ) and normally open contact (but). When the flow of the working medium of the NZ-contact opens, and but it is closed.

There are several types of duct sensors:

Petal Relo Relay

The figure shows the pattern of the petal duct sensor.

As can be seen from the name, the main working element of this type of duct sensor is a flexible petal, which is in contact with the working medium and deviates from the vertical position in the case of flow. The petal is mechanically connected with the output contacts and changes their condition when it is rejected.

Caleffi duct petals and Danfoss (left)

Turbine type duct sensor

The figure shows the turbine duct sensor scheme.

Such sensors are a small turbine, the rotor of which is equipped with a magnet. When the working substance flow passes through the turbine device, the turbine begins to rotate, as a result of which the magnetic field occurs, which is converted into electrical impulses entering electronic circuit Sensor. Electronics causes a change in the state of the output contacts in the presence of a stream, as well as in the petal sensor.

Thus, such duct sensors have two types of outputs: output contacts (but also NZ) and pulse output. The latter is used to determine the flow rate: the greater the pulse repetition frequency - the greater the flow rate.

Duch sensor (turbine) for the ARISTON boiler

As an example of a sensor of this type, the ARISTON gas boiler gap. When a stream appears (when the user opens a hot water faucet), the sensor generates an output signal and translates the boiler to mode heating GVS..

Using Protok Sensors

Duch sensors most often performed protective, information or control functions.

The protective function is related to the detection of the stream in systems where its absence can lead to emergency situations or equipment breakdowns. So, for example, the pumps protect, because When working in the absence of water flow, their overheating occurs and failure. You can also define the lack of air flow in ventilation systems when the filter is clogged, closes the flap or fan breakage. With the help of a duct relay, you can reveal leaks in water supply systems, determine the absence of water in cumulative tank etc.

About the information function of the channel relay speak when the presence or absence of a duct is not associated with an emergency, but is meaningful event In the system you need to know the user. In such cases, the sensor trigger is used to enable light or sound indication, or form a message to the operator panel.

The control function of the duct relay performs when another equipment is turned on by or turns off or turns off. For example, in gVS systemswhen the user opens a crane with hot waterThe gas boiler should turn on the pump and go to the heating mode of the DHW. This happens just when the duct sensor is triggered after opening the crane.

Double Relay Connection Scheme

The following figure shows a typical circuit for turning the flow sensor for the pump.

In the absence of duct, the contact 1-2 is open, and the NZ contact 1-3 is closed, the power circuit is open, the pump is stopped. When the flow of water appears through the relay, its contacts change their state, the supply circuit of the pump is closed and it turns on.