In diesem Blog werden fotoelektrische vs. Ionisations-Rauchmelder und geben Sie einige Tipps zur Beschaffung.
What Are the Types of Smoke Alarms?
What Is an Ionization Smoke Detector?
Ionization smoke detection is a widely used to detect indoor fire smoke . It warns of fires and allows users to deal with fire risks in advance. It mainly contains an ion generator, a detection chamber and a signal processing circuit.
What Is a Photoelectric Smoke Detector?
A Photoelectric Smoke Detector is a device that uses optical principles to detect smoke produced in the early stages of a fire. They are mainly classified into two types, light-blocking type and scattering type. The light-blocking detector recognizes the presence of smoke by measuring the blocking effect of smoke on light. The scattering detector judges the concentration of smoke by measuring the scattering effect of smoke on light. When the smoke particles scatter light, the intensity of the scattered light is generated in different directions.
How Do They Work?
Ionization Smoke Detector
The ionization chamber inside the ionization smoke detector is the first procedure to sense the smoke physically. Its core component is an ion generator which consists of two electrodes with radioactive isotopes inside a gas. In particular, alpha particles emitted by isotopically radioactive gases can strike air molecules to ionize them and form positive and negative ions. These positive and negative ions then enter the test chamber, which contains two parallel metal plates with positive and negative charges. Under the action of an electric field, they move toward their respective electrodes to maintain a balanced current of ions.
If there is an external smoke into the detection chamber, the smoke particles will adsorb on the gas ions to form a certain charge and hinder the movement of the gas ions. Auf diese Weise, the number and distribution of ions in the test chamber will change. daher, the potential of the reference output point of the ion chamber also changes. If this change exceeds a certain threshold, the detector will decide that there is fire smoke indoors.
Photoelectric Smoke Detector
The working principle of the photoelectric smoke detector is based on the absorption and scattering of light by smoke particles. When a fire breaks out, tiny particles in the smoke enter the detection chamber. These particles scatter or absorb the light emitted by the source, so the path of light is changed. Nächste, the photoelectric element senses this change and converts it into an electrical signal for processing. If the smoke concentration reaches a preset threshold, the detector will issue fire alerts.
Difference Between Photoelectric vs. Ionization Smoke Detector
| Photoelectric Smoke Detector | Ionization Smoke Detector | |
| Working Principle | Based on the principle of light scattering or light occlusion. When smoke particles enter the detection chamber, they scatter or block the light from the source. The receiver detects it and triggers an alarm. | Ionization technology. Radioactive isotopes emit alpha particles that ionize air molecules, creating a tiny electric current. The smoke enters and changes the current intensity to trigger the alarm. |
| Sensitivity & Response Speed | It is more sensitive to larger particles of smoke. And its response is relatively slowly. | It is more sensitive to small particles of smoke. And it responds faster. |
| Type of FZorn Suitable for DSchutz | More suitable for detecting smouldering fire. (Such as the slow burning of paper and cloth). | More suitable for detecting open flames or fast burning fires. |
| False AAlarm Rate | False may be more likely to occur in dust. | Low false rate. |
| Maintenance | Regular cleaning is required so as to avoid false due to dust accumulation. | Need regular maintenance for its radioactive isotopes. |
| Anwendung | More suitable for the places where there is less dust and more risk at smoldering fires. Such as residential bedroom and living room. | More suitable for the situation where quick response is required. Such as kitchen and equipment room. |
Which Smoke Alarm is Best?
When Is a Photoelectric Smoke Detector Best?
A photoelectric smoke detector is well suited for detecting fires that produce a lot of smoke but have less flame radiation, since it is more sensitive to smoke caused by larger particles, such as paper and cloth. Mit anderen Worten, this kind of fire is often accompanied by a lot of smoke in the initial stage, and photoelectric detectors are good at quickly picking up these smoke signals.
Zusätzlich, if there is less surrounding dust, the performance of photoelectric smoke detectors is more stable. Because dust particles can also scatter light.
When Is an Ionization Smoke Detector Best?
Ionization smoke detector is more suitable for detecting those fires where the flame radiation is strong with fast burning rate, because it is very sensitive to the smoke of tiny particles. When it is applied in the kitchen where there are fumes and small particles of smoke, it can respond quickly. Darüber hinaus, it is very suitable for some places that require high fire response speed, such as computer rooms and equipment rooms. It is good at sensing tiny smoke signals in the early stages of a fire.
Combination Ionization and Photoelectric Alarm
Combination Ionization and photoelectric alarm integrates the ion and photoelectric detection technology. Due to the complementarity of the two technologies, the combined detector does well in detecting fire smoke in earlier stage, allowing more time for evacuation and firefighting operations. Außerdem, through the dual detection mechanism, the combined detector can reduce the rate of false alarm.
IoT Technology Helps Build a Fire Alarm Monitoring System
The IoT technology converts the analog signal, which is collected by the sensor, into a digital signal through the ADC. And then it transmit the data to the cloud or a designated receiver in real time through the IoT communication module. In particular, the IoT communication module can be Zigbee, Bluetooth and so on. The receiver can be the user’s mobile app, computer or tablet.
With IoT technology, when there is an anomaly indoors, fire alerts will be multiply sent to the user through audible and visual alarms, SMS notifications, and APP. More and more, the smoke alarm can be paired with smart door locks and smart fire extinguishers in the home. When a fire comes, they can play a role in assisting escape and extinguishing.
Things to Consider When Sourcing Smart Smoke Sensor
· Sensitivity and accuracy: The primary task of the sensor is to accurately and timely detect smoke, so its sensitivity and accuracy are crucial. We advise you to choose a product that can accurately identify different types of smoke to avoid false alarms.
· Technology type: There are mainly photoelectric, ionic and combined smoke sensors on the market. Each technology type has advantages and disadvantages. So users can select based on application scenarios and requirements. Zum Beispiel, photoelectric sensors are sensitive to larger particles of smoke, while ionic sensors are more sensitive to tiny particles.
· Communication mode: Users should also consider the communication mode of sensors, such as Wi-Fi, Zigbee, NB-IoT. For home systems, we recommend stable and reliable communication protocol.
· Battery life and low power consumption: For wireless smart smoke sensors, battery life is an important consideration. We recommend choosing products with a low power design to reduce the frequency of battery replacement. After all, it is not convenient to change the battery of the smoke sensor in the ceiling.
· Certification: Users should ensure that purchased smoke sensors comply with safety certification.
· Brand and after-sales service: Please choose products from well-known brands, since they usually mean more reliable quality and more perfect after-sales.
· Cost performance: While considering the above factors, we should also choose the product with higher cost performance.
Why Partner with Phixson
Phixson is an electronics manufacturer with more than 10 years of experience. It has ISO9001 quality system and flexible ODM service. It enjoys a good reputation in the overseas B2B market. If any inquiry, please feel free to contact us.
FAQ
How can I tell if my alarm is ionization or photoelectric?
The most direct way is to consult the product manual or label of the alarm. These documents usually specify the type of alarm.
Should I Put A Photoelectric vs. Ionization Smoke Detector Near My Kitchen?
Photoelectric smoke detectors. This is because photoelectric smoke detectors are more sensitive to larger smoke particles for detecting large smoke fire sources in the kitchen. Im Gegensatz, ionization smoke detectors are more sensitive to tiny smoke particles. If the user keeps it in the kitchen, these larger smoke particles are more likely to touch its false positives.
By the way, when installing, the user should ensure that the detector stays far away from the cooking area to avoid interruption by oil fumes and vapors. In der Zwischenzeit, it is also very important to clean and maintain smoke detectors regularly.
Do Photoelectric Smoke Detectors Have More False Alarms?
In places which are prone to steam and water mist in certain environments, the photoelectric detector may be false because of small droplets of water vapor condensation. Jedoch, as technology continues to advance, modern photoelectric smoke detectors have come with more advanced algorithms and techniques to reduce false positives. Zum Beispiel, some detectors can analyze the appearance characteristics of smoke particles to distinguish between real fire smoke and interference, thereby improving the accuracy of alarms.
How to Silence a Photoelectric Smoke Detectors?
Before you turn off or mute the detector, make sure you have ruled out real hazardous situations such as smoke or fire.
Find the mute button
Many photoelectric smoke detectors have a mute button. This button is usually located on the front or side of the detector. When the detector makes an alarm sound, please press the mute button directly to end the alarm sound.
Use mobile APP
High-end photoelectric smoke detectors often support remote control and setting via a mobile APP.
Users first find the mute function option in the APP, and then click the stop alarm button.
Check the battery and power supply
If the detector is battery powered and the alarm sounds continuously, there is another possibility – the battery is low. An dieser Stelle, you can try to replace a new battery to solve the problem.
