Connecting and operation of the relay (sensor) of the duct. Water Driver Relay - Purpose, Principle of Work and Independent Connection Principle of Water Drive Relay

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 throughput. 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 duct sensor for gas boiler 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 R58. 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

Modifications low pressure It is 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

Models high pressureUsually 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.

Water duct relay is a multifunctional device, the main task which remains automation of the pump, water supply regulation. The sensor turns on and off depending on its presence in the system. We supply sensors performed only from high-quality environmentally friendly materials, due to which the water duct relay can even interact with drinking water, not distorting its composition. At the same time, we have on the water flow sensors the price is lower than in the city stores.

Sensors are mainly connected to pumps with high powerSince they effectively protect the pump from overheating and other possible troubleshooting. Thanks to this, the water duct relay for the pump prolongs its service life and provides the convenience of using the pump. The advantages of the duct switch for the pump are: small-sized, high sensitivity, multifunctionality, affordable price, long term operation. If you do not have time to constantly monitor the operation of the pump, then the sensor will do it for you.

When the pressure control sensor is installed, it is necessary to resort to the help of specialists, since in the initially the duct switch for the pump needs to be configured. Installation is carried out as follows: The inlet water duct switch is connected to pumping device. With a sufficient flow of water, the device is activated, due to the pressure on the shovel of the sensor. By reducing the flow of water, the shovel of the sensor returns to its original position and the water supply is stopped. You can buy a water flow sensor for the pump in Moscow at an optimal price convenient for you payment.

The water supply system of the private house is impossible without a pump. But it must somehow turn on and off, make sure that it does not work in the absence of water. The turning on-shutdown of the pump corresponds to the water pressure relay, and to monitor the presence of water should protect against dry pump. How to implement this defense in of different situations And we will consider further.

What is a dry pump

Where it would not rock the pump water, sometimes it creates a situation that the water is over - with a small debit of a well or well, water can be simply allocated. In case water swinging from centralized water supply, its feed can simply stop. The operation of the pump in the absence of water and is called dry running. Sometimes the term "idle move" is used, although it is not entirely correct.

So that the water supply of the house worked normally, not only the pump, but also a dry WELL protection system, automatics on-shutdown

What is bad in a dry course, except that electricity is wasting? If, in the absence of water, the pump will work, it will overheat and burn - pumping water is used to cool it. No water - no cooling. The engine will overheat and burn. Therefore, protection against dry pump - one of the components of the automation, which will have to arrive. There is, however, models with built-in protection, but they are expensive. Cheaper buy automation.

How can I protect the pump from dry stroke

There are some different devicesthat turn off the pump in the absence of water:

dry protection relay;
water flow control devices;
water Level Sensors (Float Switch and Urvny Control Relay).

All these devices are intended for one - turn off the pump in the absence of water. They only work in different ways, have a different scope. Further will figure out in the peculiarities of their work and when they are most effective.

Dry protection relay

A simple electromechanical device controls the presence of pressure in the system. As soon as the pressure drops below the threshold, the supply circuit is broken, the pump stops working.

It consists of a relay from the membrane that responds to pressure and contact group, which is opened in the normal state. When the membrane pressure decreases, the membrane presses, they closes, turning off the power.

It looks like protection against dry pump

When it is effective

The pressure on which the device reacts is from 0.1 atm to 0.6 atm (depending on the factory settings). Such a situation is possible when there is little water or it does not quite, the filter clouted, the self-priming part was too high. In any case, it is the condition of the dry stroke and the pump must be disconnected, which happens.

Installed protection relays from idle move On the surface, although there are models and in a hermetic case. It works normally in a watering scheme or any system without a hydroaccumulator. More effectively works with surface pumps when check valve Set after pump.

When it does not guarantee a shutdown in the absence of water

It is possible to put it in the system with HA, but you will not receive 100% protection from dry drum. It's all about the structure of the structure and work of such a system. Put a protective relay in front of the water pressure switch and the hydroacherumilator. In this case, there is usually the return valve between the pump and protection, that is, the membrane is under pressure generated by the hydroaccumulator. This is a regular scheme. But with this method of inclusion, a situation is possible when the pumping pump does not turn off and overheat.

For example, a dry movement situation was created: the pump turned on, the water in the well / well / no container, in the hydroaccumulator there is some quantity. Since the lower pressure threshold is usually set about 1,4-1.6 atm, the protective relay membrane will not work. After all, the pressure in the system is. In this position, the membrane is pressed, the pump will work dry.

It will stop or when it begins or when the hydroaccumulator is spent most of the stock of water. Only then pressure will fall until critical and the relay will be able to work. If this situation arose during the active use of water, nothing terrible will not happen in principle - several tens of liters run out quickly and everything will be normal. But if it happened at night - the water was lowered in the tank, the hands were waved and went to sleep. The pump turned on, there is no signal to shut down. By morning, when the water analysis begins, it will be in a non-working condition. Therefore, in systems with hydroaccumulizers or pumping stations, it is better to use other protection devices from the dry stroke of the water pump.

Water flow control devices

In any situation, which leads to the dry move of the pump, the flow of water is insufficient or absent at all. There are devices that track this situation - relays and water flow controllers. Relay or duct sensors - electromechanical devices, controllers - electronic.

Relay (sensors) duct

Duch sensors are two types - petal and turbine. The petals have a flexible plate, which is in the pipeline. In the absence of water current, the plate deviates from a normal state, the contacts that turn off the pump are triggered.

Turbine flow sensors are somewhat more complicated. The base of the device is a small turbine with an electromagnet in the rotor. If there is a stream of water or gas, the turbine rotates, an electromagnetic field is created, which is converted to electromagnetic pulses read by the sensor. This sensor, depending on the number of pulses, includes / turns off the pump power.

Control controllers

These are mainly devices that combine two functions: protection against dry stroke and water pressure relay. Some models plus to these features can have a built-in pressure gauge and check valve. These devices are also called electronic relays Pressure. These devices do not call these cheap, but they provide high-quality protection, listening out several parameters immediately, providing the pressure required in the system, turning off the equipment with an insufficient water flow.

Name	Functions	Dry protection protection parameters	Connecting dimensions	Producing country	Price
Brio 2000m Italtecnica.	Pressure switch + flow sensor	7-15 seconds	1 "(25 mm)	Italy	45$
Watercolobot turbipress	Pressure relay + duct relay	0.5 l / min	1 "(25 mm)		75$
Al-Ko.	Pressure Relay + Reverse Valve + Dry Protection	45 seconds	1 "(25 mm)	Germany	68$
unit automation unit	Pressure relay + idling protection + pressure gauge		1 "(25 mm)	Russia	38$
aquario automation unit	Pressure switch + idling protection + pressure gauge + check valve		1 "(25 mm)	Italy	50$

In the case of using the automatic unit, the hydroaccumulator is an excess device. The system works great on the emergence of consumption - the opening of the crane, triggering household appliances etc. But this is if the reserve for pressure is small. If the gap is large, needed, and the pressure relay is also needed. The fact is that the disabling limit in the automation unit is not regulated. The pump will turn off only when it creates maximum pressure. If he is taken with a big margin of pressure, then it can create overpressure (optimal - no more than 3-4 atm, all that leads to premature wear of the system). Therefore, after the automation block and hydroaccumulator. Such a scheme makes it possible to adjust the pressure at which the pump is turned off.

Water level sensors

These sensors are installed in the well, well, capacitance. It is advisable to use them with submersible type pumps, although they are compatible with superficial. There are sensors of two types - float and electronic.

Float

There are two types of water level sensors - to fill the container (protection against overflows) and emptying - just protection against dry stroke. The second option is our first needed when filling. There are still models that can work and so, and the principle of operation depends on the connection scheme (in the instruction).

The principle of operation when used to protect against dry runoff is simple: while there is water, the float sensor is sick up, the pump can work as soon as the water level fell so much that the sensor dropped, the contactor opens the pump power supply, it cannot be engaged until While the water level will not rise. To protect the pump from idling, the cable float is connected to the gap of the phase wire.

Level control relay

These devices can be used not only to control the minimum water level and dry stroke in the well, well or accumulative container. They can also control overflow (overflow), which is often necessary if there is a storage capacity in the system, from which the water is then pumped into the house or when organizing the water supply of the pool.

Electrodes are lowered into water. Their number depends on the parameters that they track. If you need to follow only the presence sufficient number Water, two sensors are enough. One - lowers at the level of the minimum possible level, the second is basic - located just below. The water is used in the paper: while both sensors are immersed in water, small currents occur between them. This means that water in the well / well / tank is enough. If there is no current, it means that water dropped below the minimum level sensor. This team opens the pump nutrition chain and it stops working.

These are the main methods that are organized by protection against the dry stroke of the pump in the water supply systems of the private house. Is there some more frequency convertersbut they cost expensive because it is advisable to apply in large systems with powerful pumps. There they quickly pay off due to electricity saving.

Effective work pumping equipment - This 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 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 disables pump station With the appearance and passage of the flow of water through it. 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 circulating 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.

FLU-25 is traditionally reliable monitoring of the presence of water flow in heat-generating systems. Produced at the plant in Germany.

FLU25 duct switch is used to monitor the presence of water flow in the autonomous heating system with forced circulation, Up to the minimum flow values.
Depending on the connection circuit circuit, the duct relay may include either turn off the corresponding element of the autonomous heating system when disappearing or the advent of the coolant duct. For example, when the circulating pump is disconnected, the burner can be disabled. The duct relay can also be used to protect the circulation pump from dry stroke.
FLU-25 duct switch has a metal case and can be installed in rooms with high humidity. The presence of spring bellows (bellows seal) makes a duct relay is also suitable for diesel fuel.
The package includes plates (lamella) of different lengths for pipes from 1 to 8 inches.
Installation:
To ensure impeccable operation, the duct relay must be installed on the horizontal pipeline so that the plate (lamella) is vertical. The distance between the pipe and the device should be at least 55 mm, and the distance to the subsequent reinforcement, taps or fittings on the pipeline should be at least 5 doors. The duct relay must be oriented so that the direction of the arrow on the housing corresponds to the direction of the duct in the pipeline.
If there is extraneous mechanical inclusions and high pollution in the coolant, it is necessary to install a mechanical cleaning filter before the duct relay.

Specifications:
Microswitch (relay) 6 A - 220 V
Maximum operating pressure 10 bar.
Maximum coolant temperature 110 ° C
Maximum ambient temperature 60 ° С
IP 54 protection class inner diameter Cable entry 6mm (included)
Outdoor thread G1.

Installed on DU25 pipes ... Du 200mm

Adjusting the Relo Play:
The table below gives the values \u200b\u200bof the required length of the lamella in accordance with the pipe diameter.
The trigger threshold (operating point) is determined by the springs voltage (10), the screw setting (8) and the lamella length (a).
The table shows the diameters of the pipes corresponding to the lamellae lengths and the water consumption in the M3 / h, in which the microswitch contacts are closed or opening the minimum value (the screw is tightly tightened) and when the maximum value is installed (the screw is completely weakened).
The device comes with a tightly tightened calibration screw (the minimum value is set). Contact 1 - 2 open. After starting the pumps or when setting the nominal flow of water, the lamel should shift in the direction of water flow, resulting in a contact of 1 - 2, and the burner begins to work.
If the lamel does not shifted, this means that the flow of water is too small and the device cannot react. However, in practice, this is almost completely excluded, since the value of water consumption is usually significantly more than the installed minimum value (for example, 6.3 m / h at 3 "pipe diameter). If the real water consumption is known, the device can be accurately adjusted (see the table in the Specification section, pDF file).
Duct switch in heating systems with simple control ON-OFF does not require accurate calibration. It is enough to establish the minimum value so that the contact that controls the burner will be closed, as soon as the established water consumption is reached (see Table).

Read more in the specification (PDF file below)