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Motion sensors in Everyday life They are actively used in security and alarm systems, for economical power consumption in lighting systems and other needs. If their operating mode is violated, do not rush to call a specialist or send the device to service center for repair. In most cases, a malfunction occurs due to changes in the environment or in the power supply circuits; the consequences of this can be easily eliminated independently. They rarely break individual elements on boards, microcircuits, transistors, relays and other parts that require intervention professional specialists. But for correct elimination problems and settings must be understood general principle operation of these devices.

How motion sensors work

There are many types of motion sensors:

• infrared;
• microwave;
• ultrasonic;
• combined.

They are all united by a common operating principle: when changes occur in the viewing sector, the electrical signal is amplified and sent to a relay, which closes the contacts to turn on, alarm, lighting or other devices, such as a fountain or music. Let's take a closer look at the operation of infrared sensors, since they are most in demand by consumers due to price and quality.

Infrared sensor design

One of its main elements is a pyroelectric detector, which consists of a pair of rectangular crystals that respond to infrared radiation within a certain distance. With a uniform background of space, currents of the same magnitude are induced in the crystals. When a heat source appears in a sector of one of the crystals, a difference in current values ​​occurs. This impulse is intensified and transformed into digital signal and is sent to actuators, relays with a group of closing contacts.

For more efficient work A Fresnel lens is installed in front of the pyrotransmitter at a distance of 1.5–2.5 cm, which focuses infrared radiation on the crystals. More precisely, this is an optical system from a group of lenses of 20–60 pieces, milky or gray, made of plastic. The system has a spherical shape, thereby expanding the field of view of the sensor.

The sensor, which is located in the figure on the left, is recommended to be hung on the ceiling in the center of a large room with several entrances. An overview of such a device is 360˚, three pyroelements with a sector of 120˚ each.

The second sensor has a horizontal viewing sector of no more than 180 ̊, it is usually placed in the direction of a door or external gate, fixed to the walls of buildings, it has the ability to change the direction of the vertical viewing sector.

Main signs of sensor malfunction, possible causes

There may be three signs:

• unauthorized activation, at any time without any reason;
• does not turn off the lighting lamp;
• does not turn on the lighting lamp or other terminal devices, and does not respond to obvious signs of movement in its field of view.

Sequence of troubleshooting and troubleshooting

In any case, you need to start with an inspection appearance, are there any obvious mechanical damage optical system Fresnel lens, or a simple layer of dust and dirt. If necessary, wipe the lens and check the functionality of the sensor. This is the most common and simplest cause of malfunction. If there is no positive result, you will have to perform more complex operations:

• Remove the housing and check that the connection is correct.

• Use a multimeter or other devices to check the presence of incoming power at the input of the printed circuit board.
• If there is power, simulate the conditions under which the sensor should operate. Install average level lighting, in which the sensor is triggered in the dark and during daylight hours, maximum level sensitivity and minimum operating interval.
• If in this position the sensor begins to trigger, gradually set the desired parameters from the sensitivity level, then lighting and operating time. Periodically checking the response to the source of movement.
• After these operations, if the result is negative, turn off the power electrical circuit, we remove everything decorative elements and carefully inspect the printed circuit board.
• Areas of burnt elements, integrity of wires and jumpers, and reliability of soldering of radio components are identified. It is recommended to do this with binocular glasses or a magnifying glass. If you find poor-quality soldering, solder the contacts of the dropped elements. After this, check the functionality of the sensor.
• If you find burnt-out elements, replace them, having first checked the parameters of the neighboring ones involved in the circuit chain.

• If, when simulating driving conditions, the relay is activated, a characteristic click is heard, and the lamp does not light up, it means that the circuit between the relay contacts and the lamp is faulty, ring it. The relay contacts may have oxidized; replace it or clean the contacts. I do not consider the lamp to be faulty; this needs to be checked first.
• Measure the DC voltage after the converter; depending on the sensor model, it can be from 8–24 V (see diagram and other documentation). The measurements are carried out relative to zero; it is convenient to take the “-” diode bridge on the boards.
• If there is no required voltage, ring the elements in the converter circuit, most often these are diodes of the rectifier bridge.

It happens that a short circuit in the circuit following the bridge or stabilizer extinguishes the incoming voltage. To verify this, disconnect the entire circuit after the stabilizer. If there is voltage, look for a short circuit, a faulty element after the stabilizer. This way you can ring the entire circuit up to the relay and lamp, when identifying faulty elements change them and check their functionality. If you follow this method, you will definitely find the cause of the malfunction; this method is good when a person has the skills to work with electronic equipment, measuring instruments, knows how to solder. When you don’t have such skills, you need to limit yourself to the first points: wiping, setting up, checking the power supply. If the elements on the board are faulty, contact a specialist.

Leaving the lights on on streets or indoors all night is unreasonable and irrational. To ensure that the light bulbs only shine when necessary, a motion sensor is installed in the lighting power supply circuit. If a moving object appears within its range of action, a signal is sent to the detector and the lighting lights up.

When the object disappears from the sensor's operating area, the light goes out. This mechanism of action showed itself perfectly in lighting:

• streets;
• utility room;
• warehouses;
• corridors;
• flights of stairs;
• entrances;
• basements, etc.

Motion sensors are used in places where people periodically appear. The devices help save energy and provide convenience when using lighting.

However, like other devices, motion sensors sometimes break down, fail, or work incorrectly. This may be due to problems inside the device or incorrect connection and setting. If the sensor malfunctions, you need to find out the cause and eliminate it.

Features of work

The electrical sensor records the movements of people and other objects in its coverage area. When a person enters the activity radius of the device, the sensor system of the detector is activated, transmitting the received information to the mechanism to which it is connected.

Work principles different types sensors:

• Ultrasonic– operate by the method of reflecting ultrasonic spectrum rays from surrounding objects. When a moving body enters the detector operating area, the frequency of the reflected wave from the object changes, which is recorded by the receiver. It sends a signal to turn on the light;
• Infrared The sensors work by analyzing thermal infrared radiation. The device contains two sensitive receivers – pyroelectric elements. Both analyze IR radiation. If there is no movement of objects emitting heat in the coverage area, the signals received by the elements will be the same. Therefore the sensor does not turn on. And when a living object moves and falls into the operating area of ​​one of the elements, the signals coming from both receivers are different. Therefore, the sensor detects the presence of movement and the light comes on. Infrared devices sense temperature fluctuations environment. In this regard, it is prohibited to install them in the kitchen or near entrance doors. To prevent the light from turning on due to the movement of small animals within the operating radius of the sensor, it is necessary to correctly set the operating temperature range;
• Microwave devices emit electromagnetic waves high frequency 5.8 GHz. Waves reflected from objects are recorded by the sensor and when the slightest difference in the reflected signals appears, the microprocessor of the sensor is triggered and turns on the lighting. The device is sensitive to movement. But it has its drawbacks: high consumption energy, which is important to consider when operating the device from batteries, as well as high cost.

Typical breakdowns and ways to fix them

Motion sensors for lighting operation are subject to the following faults:

• Lack of inclusion.
• Lack of timely shutdown.
• Switching on and off occurs spontaneously.

If the motion sensor for the light does not work, first check that it is connected correctly. At this stage, determine why the device stopped working and under what circumstances this happened. Reasons why the device could break:

• There was a power surge.
• There was a power outage in the area.
• Accidental impact with a foreign object.
• An unpleasant smell was heard.
• The device was exposed to rain or flooded by neighbors above.
• Previously, the device did not always work properly, etc.

Once you find out the cause of the breakdown, you will understand in which direction to move next. Check that the device is connected correctly to see if the required power is being supplied to the device, and if there are indicators, whether they are lit.

Another important point– sensors often fail if their operating parameters are poorly configured or not configured at all. The user may have made a mistake when installing the controls. After the error is corrected, the device will work properly. To do this, put all the controls in a position in which the light is most likely to turn on. Set the sensitivity to the highest and the operating time to the shortest. Under these conditions, you will analyze the sensor's performance and its ability to respond to movement.

The sensor does not work due to incorrect settings

If your fixture won't turn off the lights or isn't functioning properly, take a look at the settings first. On the body of the device you will see three controls labeled SENS, TIME and LUX.

• The SENS indicator controls the sensitivity of the motion sensor.
• The TIME parameter determines the delay time before the light turns off.
• The LUX indicator determines the degree of illumination at which the light bulb will light up. If the ambient light intensity is higher than the set value, the light will not turn on until the street or room darkens to the set threshold.

By correctly configuring all of the above parameters, you will prepare the sensor for operation in certain conditions. From the very beginning, they must be installed by the electrician who installed the sensor, or by the user himself.

When working with professional equipment, adhere to the recommended parameters. The following values ​​are set for the dimmer:

• In the work area (offices, workshops, offices) the threshold is 600 lux.
• In walk-through areas – 75–200 lux.
• In working conditions with increased visual load – 1000 lux.
• The average value of the illuminance range is from 2 to 2000 lux.

If you find it difficult to determine correct parameters, then it’s better not to change the indicators yourself. Install initially smallest value. Due to this, the sensor will turn on the light when there is minimal lighting.

And if you set the maximum level - 2000 lux, then the light will light up constantly. IN in this case, from the point of view of serviceability, the device will operate correctly - as the settings indicate to it. But in practice, its work will be useless to the user. If any malfunctions are found, contact specialists who are knowledgeable in adjusting settings.

Malfunctions of the motion sensor can also be caused by an incorrectly configured sensitivity value. If the parameter is set incorrectly, the sensitivity of the device in its coverage area may decrease. For example, with the slightest movement the device may not turn on.

Often, incorrect adjustment of the illumination, time and sensitivity values ​​leads to the fact that the light does not go out after the disappearance of movements in the sensor operating area. If the light bulb does not turn off for too long without moving objects, the turn-off delay time needs to be checked. The reason for this may be an overestimated value of the TIME parameter, which does not make it possible to open the output contacts that control the lighting fixtures. The TIME parameter has its own average indicators:

• 5 minutes – for passages and corridors;
• 15 minutes – for work areas.

Incorrect installation location selected

For all types of sensors, certain rules for installation and location selection are provided. If they are not followed by the installers, the devices begin to malfunction.

Signs incorrect installation motion detectors are as follows:

• The installation height is incorrectly selected - the device is located below 2 meters.
• Sensing head is not directed correctly. It is required that it be directed in the direction that will be controlled.
• The device is in a strong draft.
• Near infrared sensor there are devices that emit heat.
• The detector's viewing window is obscured by tree branches, corners of the room, roof canopy, or other obstacles.

If the sensor does not respond every time or only when a living object approaches extremely closely, carefully check whether the device is installed correctly taking into account the described requirements.

The following parameters are of great importance:

• Action distance.
• Viewing angles vertically and horizontally.

When installing the device, place it at the required height and focus it in such a way that the specified parameters are optimally suited to the existing terrain conditions. Keep in mind that the sensor's operating area has its own boundaries.

False inclusions

Foreign objects and objects have both direct and indirect influence on the operation of the sensor.

The device is directly affected by large moving heat flows, for example, from convectors, fan coil units. Large cabinets, racks and glass partitions limit the radius of the detector and create so-called dead zones in the room.

Heating devices have an indirect effect on the operation of the device. The air flows they move cause disruptions, causing the motion sensor to fire randomly. To limit the sensor from extraneous influences and prevent false alarms, it is necessary to reduce the sensitivity of the device or use lens masks supplied with the sensor.

Microwave sensors are practically invulnerable to external influences. They function regardless of the heat of the environment and sound vibrations. However, such devices can only be used indoors. For street lighting they are unsuitable because they will be triggered by any movement, for example, when leaves fall from a tree or when branches sway.

High-frequency sensors are used in rooms with a large number of partitions, for example, in public toilets. Automation of turning the light on and off in this case is provided simultaneously by several sensors.

False activations of the sensor can be caused by technical problems device. Such damage will be determined by specialists. technical issues rarely lead to false positives. Most often, the cause of this phenomenon is poor-quality connections and twists, or incorrect installation of the device. And sometimes the reason lies on the surface and consists of incorrectly adjusted settings.

Expert opinion

Alexey Bartosh

Attention! Proper installation of the sensor almost completely minimizes all false alarms on small areas. And all time and sensitivity settings are brought to the required “condition” during further operation.

Remember that light intensity is measured from the surface. Thus, the device takes readings based on the degree of illumination in the place where it is directed. For example, when the coverage area is directed to a dark corner or place with low lighting, and measures the amount of light in a given area. In this case, the light will not turn on correctly, since it is darker in this area than in the rest of the area.

The sensor does not turn off the light

The reasons that the sensor does not turn off the lighting are as follows. Whether indoors or outdoors, there is constant movement within the operating radius of the device. Therefore, the sensor is triggered all the time. When the time to turn off the system approaches, someone enters the radius again and the device gives a signal to turn on. So, the light is constantly on.

Probably the reasons lie in the device settings:

• The delay time is not adjusted - it is set to a high value.
• The lighting brightness threshold has been exceeded.

To correct the problem, check each setting and make the required adjustments.

In rare cases, the reason for not turning off artificial lighting The sensor lies in the nuances of the operation of its electronic circuit. This happens when the device for a long time was under tension. As a result, the contact may not switch off due to residual load. The problem is solved by briefly disconnecting the device from the power supply and then turning it back on after 15–20 seconds.

The light does not turn on when the sensor is working

Failure of the sensor to operate is most often due to incorrect settings of the illumination and sensitivity of the sensor or a lack of power to the device.

First of all, check your settings. Common problem - incorrect setting illumination Optimal value set it at 200 to 300 lux. The degree of illumination in some devices is not adjustable - it has factory values, however, manufacturers can make mistakes. In this situation, go to the store where you bought the sensor to replace it.

If everything is in order with the settings, then check whether the sensor is installed correctly and whether there are other factors affecting it. For example, if any lighting fixture or another light source, it will not be able to reliably determine the degree of illumination in the area of ​​​​operation, and will not work at the right time.

Power check

Inside the motion sensor to turn on the light - electronic circuit. In order for it to start working, it must be connected to the supply voltage. Standard sensors are designed to be connected directly to a household appliance. electrical network with a voltage of 220 volts. This does not apply to radio wave sensors that are powered by a battery. The connection diagram must be present on the case.

After connecting power to the device, you need to check whether it works electrical diagram and output relay. An incandescent lamp or an LED lamp can be used as a load connected to the relay.

Expert opinion

Alexey Bartosh

Specialist in repair and maintenance of electrical equipment and industrial electronics.

Attention! The sensor operates under high voltage, dangerous to humans. Therefore, when working with electricity, be careful. It is advisable that the work be carried out by a person with education and experience as an electrician.

When repairing the sensor, turn it on using a circuit breaker with the lowest current - 1-2 A. Another option is to use a difavtomat to turn on the circuit breaker to protect yourself from the effects of current.

When power is supplied to the sensor, check for the presence of voltage on all its operating elements. For this purpose, use a device - a multitester. After checking the power distribution and supply system, pay attention to the operation of the output relay. Its contacts constantly switch external loads, which can cause wear contact group or the development of its operational life.

The correct operation of the relay also depends on the operating state of the transistor that controls its operation. Therefore, use a tester to check the operation of the transistor.

To reduce the risk of electric shock, turn off the power circuit breaker light and relieved tension During operation, provide access to the wire connection points on the sensor and luminaire. Then they should be fixed mechanically to prevent a sudden short circuit. Now apply voltage.

Electricians are used for this work indicator screwdriver and see if there is a phase on the terminal. If it is not there, the cause of the breakdown becomes clear. All that remains is to eliminate it. But this check is incomplete. It is necessary to find out whether zero potential has reached the sensor.

The potential may disappear due to failure or wear of the wires, as well as due to damage to the aluminum conductors. For quick check zero and phase potentials, use a voltmeter. If the device shows a normal value, then you don’t have to worry. If the situation is the opposite, try to find the cause of the failure. Test the integrity of the wires by measuring the resistance of sections of the circuit.

The correct operation of the sensor is also checked with a voltmeter. To do this, connect the probes to the terminals of the zero and phase outgoing wires of the light device. When the contact is closed, the device will show the internal voltage.

The sensors are equipped with LEDs that indicate the state of the devices. If the device is connected to the power supply and is in working condition, the LED blinks - on average once per second. When the detector is triggered, the flickering frequency increases, which makes it possible to understand whether the sensor is triggered without connecting a load. It must be remembered that certain types of devices become ready for operation only 20–30 seconds after turning on the power.

📋 Take the test and test your knowledge

As alarms and sensors - measuring and deviation devices certain parameters- Radio amateurs use a variety of, sometimes unusual, devices. One of them is a household lighting switch based on Motion sensors. When decoupled by power supply, i.e. when motion sensors are turned on through separate, voltage-reducing power sources, it is observed interesting effect. Thus, when the Len-V radio station with a fixed frequency of 36...42 MHz is turned on in the “transmit” mode, household switches based on motion sensors are activated 5 m from its antenna, thereby indicating that someone is supposedly in the control zone. This observation, carried out with different motion sensors, reveals the systemic nature of this deficiency. Of course, no one suggests abandoning the use of such motion sensors, especially since they have become firmly established in our everyday life and are popular in various fields and sometimes simply irreplaceable. However, as they say, “forewarned is forearmed.” In other words, you need to better know the shortcomings of devices in order to “fight” them correctly.

Household lighting switches based on a pyroelectric motion sensor respond to changes in the infrared (IR) background in the room. The devices IRA-E410, IRA-E700QW1, IRA-E900ST1, IRA-E940ST1QW1, IMD-B101-01, IMD-B102-01 and their modifications can be used as such sensors. These sensors are distinguished by high sensitivity and selectivity, compact design, low consumption energy (no more than 50 mA in the presence of an executive). They can be used as flames, presence of people, lights that react to movement in the control zone.

The author conducted an experiment and discovered unusual property motion sensors - false alarm, i.e. triggered in the absence of people or animals in the control zone. By adapting several radio transmitting devices to different frequencies in different rooms, the author recorded their interaction with household light switch devices based on motion sensors. Since household lighting switches are often installed in the private sector with any form of ownership, it seems important to highlight such an aspect of the false activation of these sensors as their arbitrary reaction to a nearby HF radio station.

When switched on in the “transmit” mode, low-power (up to 1 W) CB radio stations such as “Pilot”, “Grodno-R”, “Ural-R”, tuned to a frequency of 27.120...27.285 MHz and located at a distance of 20 m, and sensors the movements don't work. If you turn on the “transfer” mode for more than powerful source radio signal, for example, a Len-V radio station with an output power of 15 W, a false operation of a switch based on a motion sensor located in an adjacent room at the same distance from the radio station and its antenna will occur.

Radio stations of the "Len" type were produced in a three-frequency version, respectively, for radio communications at frequencies of 33.0...39.0 MHz, 39.025...48.5 MHz, 57.0...57.5 MHz, with a frequency spacing between adjacent channels of 25 kHz. The most popular Len-V sets are, respectively, automotive (1P21V-3), stationary (1P21S-4) and central dispatch network (1P21S-5) stations with emergency power. Unlike a portable stationary station, it can operate on several channels. The stationary station is equipped with a basic power supply of 13.5 V with useful current up to 7 A. For all stations, a simplex frequency modulation operating mode is provided, i.e., with forced reception/transmission switching. The most modern stations of a similar class, such as "Granit-M" without additional equipment or alterations are accordingly replaced by “Len-V” (50RTM-A2-ChM, 65RTS-A2-ChM is the same as 67RTM-A2-ChM, correspond to 1R21S-4, 51RTS-A2-ChM). Maximum power transmitter of such a radio station - 15 W.

When conducting the experiment, motion sensors of types 43801, 43802, 43811, 43812 (made in Germany), LX02, LX03, LX04 (with automatic recognition of day and night and manual adjustment sensitivity), Pyronix Colt XS (made in Great Britain) (for security systems). All sensors have IP X4 protection type, a similar purpose and respond as a standard to the activity of a nearby radio transmitter, i.e. include an actuator, the contacts of which are designed to switch a network load in a 220 V circuit with a current of up to 3 A. The difference between these types of motion sensors in this case is not significant - some of them, for example the LX02 device, have a built-in light-sensitive unit that does not allow turning on the load (lighting ) during daylight hours, as well as a unit for adjusting the turn-off time delay. These service functions are certainly convenient for the user of the devices, but they do not play a fundamental role in this experiment. It is important that IK motion sensors, based on the above pyroelectric detectors, respond to an electromagnetic field in the frequency range 250...320 MHz, 510...710 MHz and 750...1000 MHz at a field strength of 10...15 V/m (data taken from instructions for installing motion sensors 43801-43812 and reference data for pyroelectric sensors and IR radiation modules from Symmetron for 2004). This explains the false triggering of IR motion sensors when a nearby radio station switches to “transmit” mode. The field strength is a very arbitrary indicator, and it was only possible to determine the distance at which the operation of the radio station does not affect the pyroelectric sensor empirically, moving the sensor away from the radio and its antenna. In this case, this distance was more than 50 m, and the ratio of 10...15 V/m (as well as the indicated influence frequency) can only be considered as a relative parameter.

In practice, for a false alarm of a household motion sensor, which is confirmed by this experiment (enough field electromagnetic induction with a frequency of 27...42 MHz). This is not stated in any regulatory or reference document.

The electromagnetic field can be created not only by the radio transmitter, but also by other devices. This should be kept in mind when installing and operating IR motion sensors in domestic conditions and, above all, when installing devices burglar alarm. As a recommendation: it is advisable to install household and security devices based on pyroelectric motion sensors away from possible electromagnetic interference and shield the direction of possible unauthorized influence electromagnetic field in order to preserve the useful (and security) function of the sensor, and therefore the stability of the device and the safety of people whose interests this electronic sensor is intended to protect.

Security systems of various classifications are quite popular in the domestic market. A large amount of equipment is installed in order to increase the level of safety in the operation of buildings. However, problems often arise during the use of systems. Most frequent malfunctions False alarm alarms are counted when operating in active mode. In such cases, it is important to understand in detail the principles of the systems design and make appropriate decisions to eliminate all defects.

Why does the building alarm go off falsely? Technical problems

Almost all problems with alarms inside buildings arise from the wrong design for installation or the wrong selection of materials used to equip the systems. Most often, the main problem is the connecting cable for supplying signals to the main components and sensors. If the design is incorrect, the wire is laid with big amount bends and without following recommendations for operating temperature conditions. The problem is especially relevant in industrial buildings, where there is a large production equipment emitting during operation elevated temperatures. In such cases technical loop After a certain period of operation, it delaminates, simultaneously breaking contact. This results in alarms going off without any real threats being present.

In ordinary civil buildings The main technical reasons for problems with alarms are low-skilled installation and incorrect configuration of equipment automation. In such cases, unstable operation of the systems may appear immediately after the security units are put into operation. Accordingly, the owner does not know why the alarm is triggered falsely and is forced to systematically correct the operation of the equipment manually. In some situations, complete re-equipment may be required to eliminate problems, which negatively affects the amount of financial costs.

The main technical reasons why a false activation of a reed switch may occur:

1. Incorrect connection of sensors and power cables. The problem lies in the low qualifications of the specialists who performed the connection work, as well as in the haste during installation. Any wrong connection may reduce the effectiveness of building security. After all, failure to follow the installation sequence of detectors, sensors (motion, lighting, volumetric response), monitors and other equipment entails a technical failure.
2. Poor connection quality of the linear part. The use of low-quality cables and loops is one of the main reasons why the volume sensor of alarm systems is triggered. Most often observed during manual twisting without the use of automated equipment. The malfunction may appear immediately or after several years of operation. Elimination often requires complete replacement working cables.
3. Incorrect fastening of systems. Often false positives fire alarm observed due to defects in the fastening of supply systems and sensors. Any deviation from the design standards may result in disruption of the alarm and notification functionality. Contact linear systems with other communications often provokes interference, cable breaks and spontaneous shutdown of surveillance cameras.
4. Electromagnetic influence. A common cause of false fire alarms in a building. When installing smoke detectors, it is important to maintain the recommended distance from operating electrical appliances and equipment that emits its own electromagnetic pulses. If a problem occurs, it is necessary to change the location of the security system nodes.
5. Incorrect setting. Very often, false fire alarms are observed due to incorrect setting equipment. In case of an error, the security system will create significant difficulties during operation. All sensors must work properly. After all, the safety of an individual facility and the health of people depend on this.

Most the right option The solution to these problems is to contact highly qualified specialists who have experience in this field and appropriate diagnostic equipment. To avoid possible problems in the future it is best to initial stage control the installation procedure and selection of materials.

False alarms of fire alarms and security systems. External factors

External influences on the operation of security systems are no exception. False activation of a motion sensor is often observed in the actual absence of moving objects. There may be several reasons for this. Most often, devices are triggered due to improper installation near tree branches, shrubs and other ornamental plantings that sway when strong wind. In this case, the response sensitivity must be adjusted. A more serious problem is when the motion sensor is triggered by the sun during the daytime.

The main reason for spontaneous switching on is usually the presence of a significant voltage drop in the network. The motion sensor system is designed in such a way that when power is applied, the device automatically switches to activity mode. Accordingly, with a sharp surge in voltage, an independent operation occurs. An effective solution is to install a power equalization unit. Also common reasons why the motion sensor turns on and off on its own include temperature regime operation. If there is a sudden change in temperature, the protection device may turn on spontaneously. This problem can be eliminated by installing security equipment in a protective housing above the door or in a place where there are no sudden temperature changes.

False alarms. Professional problem solving

Among large quantity When it comes to troubleshooting security equipment problems, turning to professionals is considered the most correct and effective option. Experienced specialists know how to check a motion sensor in a building and eliminate any breakdowns, which in most cases are associated with poorly qualified installation. When contacting a special company, the client can be absolutely sure of high quality installation and configuration of security systems. After all, after all the work is completed, it is provided official guarantee for light, smoke, sound and other types of sensors and building safety devices. The right approach to carry out installation activities is the key to long-lasting and trouble-free service of the equipment.