1. The principle of fire detection sensors
Choosing a right Detector
In order to find the right detector for you, you need to first to clarify the purpose of your design and/or applications. Life safety products involve in various applications. First of all, two basic types are the “System Detector” which needs connection to main control unit (control panel or receiver), and the “Stand-alone” detectors which comes with the buzzer, and function independently.
The second step will be to identify the detection of various hazard situation. Most cases for fire and security application, the “SMOKE detector” is the main pick for alerting people for fire incidents. In addition, Carbon Monoxide (CO) and Gas (methane or LPG) detection is also a necessary safety alert in residential environment.
There are also combination detectors that come with multiple gas detection. For example, the combo “Smoke+Heat” detector enables you to install only one detector but capable of detecting both smoke and dangerous high temperature resulted from oil or chemical burning. The combo “Smoke+CO” detector is very convenient for you to install one detector to detect smoke and dangerous CO.
Smoke detectors
Smoke detectors are usually categorized as two main types: the Ionization smoke detector and the Photoelectric (Optical) smoke detector.
· The Ionization detector is very sensitive to fast-burning fires but does not come with lots of smoke. However, the nature of Ionization smoke chamber can easily gather static electricity and dusts. Periodical clean-up is necessary to maintain the right detection of fires.
· The Photoelectric smoke detector is becoming a trend in the general purpose fire and smoke detection in both industrial and residential applications. The main reason is the Photoelectric smoke detector utilizes non-radioactive components, and it’s particularly welcomed to meet Green Earth Advocate. Photoelectric detectors are very good in slow-burning and smoldering fires (these fires usually produce larger smoke particles). The family bedroom is the place needs this type of smoke detector.
Heat detectors
Heat detectors are usually categorized into three types: the “Rate-of-Rise” (ROR), the “fixed temperature” (FT) and the combination of “ROR” plus “FT”. They provide the protection of heat sensitive areas such as kitchens, garages, metal works, steam rooms, and utility rooms where the environment is generally dirty or smoky with lots of airborn particles , and might easily trigger the general-purpose smoke detectors into false alarms.
· Rate-of-Rise heat detectors (ROR): This type of heat detectors is particularly sensitive to a fast increase of high temperature. They are popular in the Asian markets, and as well as in some area of Europe.
· Fixed temperature heat detectors (FT): This type of heat detector are preset at certain level, and will trigger the alarm when it reaches that level. For example, 57 C is the common requirement of the preset temperature level.
· ROR+FT heat detectors: This type of heat detectors offer double protection in detecting both rapid temperature increase and high ambient temperature environment application.
Heat+Smoke COMBO detectors: this type of detectors come with an photoelectric smoke detector and a fixed temperature heat detector. They offer a general purpose protection of a rapid fire and a smoldering fire incident. The performance of this type of detectors are better than the single detection detectors, and generally popular in both the residential and industrial applications.
CO detectors
Carbon Monoxide is an extremely dangerous toxic gas that kills people in a very short of time, and without warning of odor or color of the gas. Whenever the combustion is not completely blending with enough oxegon, the carbon monoxide will be released. The CO detector protects people’s lives by detecting the CO level to a preset international safety standard, and emit loud warning sound. There are different types of CO sensing components can be used to design the CO detector. Wizmart uses both semiconductor and electro-chemical type of CO sensors for different needs in the market.
Gas detectors
Gas detectors are usually used in Kitchens to detect potential leaking of gas that might cause explosion.
