What are the sirens? The siren went off all the time

Air defense alertChangming is generally used for disaster relief and disaster forecasting and emergency reporting in the event of an emergency, and is used in wartimeCivil air defenseIt is the basic means for the people at all levels to carry out civil air defense command and organize the evacuation of personnel, and it is a siren that sounded to remind people of air defense when the city is threatened by air raids.

Sirens are divided into three types: electric alarm, electroacoustic alarm, and hand alarm. The electric siren is used by the motor as the main device of the siren, which converts the electrical energy into sound; The electro-acoustic alarm is powered by a host amplifier and speakers.

Compose; Hand sirens are complementary early warning equipment to electric sirens and electroacoustic sirens.

Job. The main tasks include: announcing air defense warning signals, publicizing them widely, and organizing test drills; Air defense warning signals are issued at the appropriate time, advance warnings are issued when the enemy is likely to carry out air raids, and air defense alerts are issued when obvious signs of air raids by the enemy are found.

When the danger of enemy air raids has been eliminated, a disarming alert is issued. Air defense alerts are usually issued sequentially, and air raid alerts can be issued directly when the air raid situation is sudden and urgent and cannot be issued.

Commonly used are air defense alarms, fire alarms, ambulance alarms, police alarms, engineering rescue alarms...

Air defense alarm, fire alarm, ambulance alarm, police alarm, engineering rescue alarm.

Audio, light, sound, light, etc.

There are many reasons why the siren in the corridor goes off, if the sound and light siren on the scene keeps sounding, it means that the fire alarm needs to be dealt with; If it is a false alarm, press the reset button of the controller host. If the alarm controller keeps ringing, you need to see what the prompt message is, whether it is a fault or a fire alarm. Faults need to be resolved in a timely manner, such as:

Problems with the line, damage to field equipment, and more.

Related Notes:

Alarm is an electronic product that reminds or warns us to take certain actions in the form of sound, light, air pressure and other forms to prevent or prevent the consequences caused by an event. Alarms are divided into mechanical alarms and electronic alarms.

With the progress of science and technology, mechanical alarms are increasingly replaced by advanced electronic alarms, which are often used in system failure, safety prevention, transportation, medical aid, emergency response, induction detection and other fields, and are inseparable from social production. Such as: door magnet.

Sensors and gas induction alarms.

The alarm mainly uses the existing ** network.

Or the wireless mobile phone network, through the wireless or wired way, connected to the owner**, or the mobile phone, to achieve remote anti-theft function of electronic products, such as infrared detectors, door magnets, smoke detectors, infrared fences, etc.

With the development of the domestic security market, the immobilizer market is becoming more and more mature.

The above content reference: Encyclopedia - alarm.

1. The alarm battery is low.

2. Most of the smoke alarms used in households are stand-alone smoke alarms, which are characterized by battery power supply, no need to connect to the mains, and it is very convenient to use. However, the battery power is limited, and if it is used for a long time, the battery will be low, and then the alarm will sound an alarm tone. Therefore, it is recommended that home users test the alarm every week to ensure that it is in working order.

3. The alarm is too dusty.

4. After the smoke alarm is used for a period of time, the sensitivity of the detector maze will be improved due to the accumulation of dust, which will lead to false alarms or alarms when there is less smoke. This is especially true in some places where there is usually a lot of dust in the air. At this time, it is necessary to contact the manufacturer or a professional to clean the detector maze.

5. The installation position of the alarm is not good.

The alarm goes off, and there are two scenarios.

The first scenario is that there is indeed a thrill. It is necessary to go to the scene to check, solve the alarm situation at the scene, and then the alarm will be eliminated.

The second case is a false positive, which occurs due to a problem with the detection head, or a problem with the setting, and after checking, it is enough to eliminate the false alarm.

1.The alarm is too sensitive, so if there is a little wind and grass around the car, it will keep ringing, and this situation can be adjusted.

2.If the door knock switch fails, the alarm will also sound. You need to go to a repair point for repairs.

3.The sensitivity of the anti-theft sensor is too high, but this is this adjustment, there is a sensitivity adjustment torque on the anti-theft vibration sensor, and you can fine-tune it.

How car alarms work:

When you knock or shake the sensor to make it vibrate, the ball rolls inside the cylinder chamber. When it rolls away from a smaller secondary electrical contact element, the circuit formed by this secondary electrical contact element and the ** electrical contact element is disconnected. At this point, the switch will turn on, indicating that the controller ball has been displaced.

As the ball continues to roll past other secondary electrical contact elements, the circuit closes and disconnects until the ball finally stops rolling.

If the vibration of the sensor intensifies, the ball rolls longer and passes through more secondary electrical contact elements before it stops rolling. If this happens, the controller will receive a short-time pulse current from all the individual circuits. The controller can measure the intensity of the vibration based on the amount and duration of the pulse received.

If the ball only rolls from one contact element to another, the controller may not trigger an alarm at all. If someone hits the car and causes a large displacement, the vehicle may sound an alarm signal: the horn goes off, or the headlights flash.

If the ball rolls for a long distance, the controller will sound the alarm across the board.

It is basically composed of two metal contacts, with the longer elastic metal contact on top of the other metal contact. You can easily set these contacts to a simple switch: when they touch each other, current passes through.

When the car shakes violently, the elastic metal contacts also shake and come into contact with the contacts underneath, creating a closed circuit temporarily.

Summary. 1. Usually if the alarm keeps ringing, it is because there is a dangerous situation. It will automatically shut down when the danger is dealt with.

2. If it is an error report, press the host button of the controller to reset. 3. If the control host of the alarm has been ringing, we need to check the specific situation, whether there is a fault or a fire, if it is a failure, it can be repaired in time, such as a problem with the line, the equipment is damaged, if it is a false alarm, the alarm signal can be reset again. If there is a real fire, we should take the emergency plan and deal with it in time.

The room alarm goes off every few minutes.

How to deal with it. 1. Usually if the alarm keeps ringing, it is because there is a dangerous situation. It will automatically shut down when the danger is dealt with.

2. If it is an error report, press the host button of the controller to reset. 3. If the control host of the alarm has been ringing, we need to check the specific situation, whether there is a fault or a fire, if it is a failure, it can be repaired in time, such as a problem with the line, the equipment is damaged, if it is a false alarm, the alarm signal can be reset again. If there is a real fire, we should take the emergency plan and deal with it in time.

The car alarm can be said to be a vehicle part with a relatively high failure rate, and the car we mentioned today is one of the fault phenomena when the car is locked and alarmed for no reason. So, what is the reason for this problem, if we want to know the answer, we must first know what the problem is.

1.Anti-theft device sensitivity issues.

If the car alarm keeps ringing, it is likely that the sensitivity of the burglar alarm is too high, causing the device to feel a little vibration and sound the alarm. How to solve it? First of all, you need to find the main engine of the burglar alarm, which is generally under the steering wheel and inside the guard plate under the A-pillar.

Then, you can directly adjust the sensitivity adjustment button, but don't adjust it too low, otherwise it will reduce the car's anti-theft alarm coefficient.

2.Immobilizer wiring issues.

If the car alarm is abnormal, it may also be because there is a problem with the main circuit of the burglar alarm, which needs to be checked, repaired or replaced in time. But whether it's checking the circuit or replacing the alarm, we're better off leaving it to a professional. After all, this kind of problem is really beyond our ability.

In addition, many circuits are integrated into the main unit of the alarm. If the installation is not professional or the circuit is reversed, the burglar alarm cannot be used, otherwise it will burn out the internal parts of the car. Therefore, if the car owner wants to deal with the problem privately, he must think twice.

3.The vehicle is low on fuel.

If there is not enough fuel in the vehicle's fuel tank, the trip computer will give an alarm. The owner can tell whether the vehicle is short of fuel by the fuel gauge on the dashboard. Solution 1:

After the engine starts, the driver completes the gear shift operation, and the body radar probe detects that there are obstacles around the vehicle or the body is too close to other objects, and will remind the driver to observe the vehicle's surroundings to prevent the body from scratching or jolting. In this case, it is normal for there to be an alarm sound in the car, not a vehicle breakdown.

It could be that some children or cats are around the car and trigger the alarm, or it may be that the trigger is too sensitive and some slight movements will cause the alarm, or it may be that the door is not closed tightly, or the trunk of the hood is not closed.

There is a possibility of poor contact, or the alarm is faulty, the alarm is short-circuited, the parts are aging, and there is a heat source.

It's because the car's anti-alarm system is so sensitive that it will ring as long as it makes some small sounds.

The sound of the air defense siren was sounded through a loudspeaker.

To sound the alarm, a control room and a loudspeaker are required.

1. There is only one **, a short-wave radio, two computers and two black civil air defense police such as answering the service system ** controller in the control room.

All districts, counties, towns, streets, industrial factories and mines have such equipment, and when the alarm system is sounded here, the alarm system distributed in all districts of the city will also be turned on at the same time.

2. The device that finally emits the alarm - the tweeter. The device is quadrangular in shape, with four tweeters on each side, allowing the alarm to sound in all directions.

In fact, the coverage area of the alarm sound at each point is about one kilometer. The control system at this point is capable of controlling all alarm systems in the nine districts of the main city. All the alarm control systems in the city, just like the ancient fire platform, one after another, let the alarm sound go to the sky and the earth without dead ends.

There are two main purposes for the annual siren test sounding: First, to test the integrity of the city's air defense warning facilities and to test the coverage of the siren sound. The second is to commemorate the tens of thousands of compatriots who died during the War of Resistance Against Japanese Aggression, warn the people not to forget the national humiliation, be prepared for danger in times of peace, and strengthen the concept of national defense and civil air defense.

Air defense alarms are issued from various air defense warning facilities, and the specific setting of vertical limb clusters is planned according to the situation of the city, and is generally installed near the living areas of the common people, and some are installed on residential buildings.

Sirens are classified in different ways. According to the energy conversion method, it is divided into four categories: electric, electroacoustic, pneumatic and hand-cranked siren; According to the different conditions of use, it is divided into two types: fixed siren and mobile siren, and the mobile siren is mainly installed on the car with the air defense siren. In addition, whistles, wired and wireless Yuying radio, television, **, hunger Internet and bell ringing gongs, etc., can also be used as auxiliary equipment and means of alarm.