Comparison of photoelectric smoke alarms and ion infrared thermometers
There is an optical maze inside the photoelectric smoke alarm, which is equipped with an infrared tube. When there is no smoke, the infrared receiving tube cannot receive the infrared light announced by the infrared emitting tube. When smoke enters the optical maze, it undergoes refraction and reflection, and the receiving tube receives the infrared light. The intelligent alarm circuit determines whether the threshold is exceeded, and if it exceeds the threshold, an alarm is announced. Ionic smoke detectors need to be more responsive to small smoke particles and can respond evenly to various types of smoke; The forward facing photoelectric smoke alarm is more responsive to slightly larger smoke particles, but less responsive to gray and black smoke. When a raging fire breaks out, there are more small particles of smoke in the air, while during smoldering, there are slightly larger smoke particles in the air. If a fire breaks out and a lot of fine particles of smoke are released, the ion smoke alarm will sound the alarm first than the photoelectric smoke alarm. These two types of smoke alarms are not very close in time, but the extension of such fires is extremely fast. It is recommended to install ion smoke alarms in such places. After another type of smoldering fire occurs, there are many slightly larger smoke particles, and the photoelectric smoke alarm will sound the alarm first than the ion smoke alarm. This type of place advocates installing photoelectric smoke alarms. If you want to combine the interests of both, you can install both types of smoke alarms in the area where they are needed.
Comparison between gas sensitive infrared thermometer and ion based infrared thermometer:
Fire smoke is a mixture of gas, liquid, and solid particles, with physical properties such as volume, mass, temperature, and charge. Ionic infrared thermometer passes through an external ionization chamber where smoke escapes. Disturbing the normal movement of charged particles, the smoke situation in the air is determined by changes in current and voltage. And gas sensitive thermometers are used to explore the composition of certain combustible gases in the air, so in fire exploration, the function of gas sensitive thermometers is not as good as ion thermometers. Gas sensitive thermometers can effectively detect trace leaks of various combustible gases such as coal gas, liquefied petroleum gas, natural gas, and carbon monoxide in the air. They are more suitable for industrial enterprises such as petroleum, chemical, coal, power, metallurgy, and electronics, as well as places where combustible gases are produced and stored such as gas plants, liquefied petroleum gas stations, and hydrogen stations.
