Wireless fire alarm system is a another shape of the original standard fire alarm system.
Wireless fire alarms are a good use of wireless radio frequency technology as they are used in certain applications:
- Applications that has very difficult rout to lay cables
- Museums and valuable historical places that don’t accept digging or installation works
- Temporary applications that not need infrastructure work
Note that most of valuable or historical palaces that use wireless fire alarm systems also use wireless security cameras (video surveillance system), applications of radio frequency wave propagation.
Typical wireless security system uses wireless alarm system and wireless CCTV video recording system.
In some countries you must take permission or pay some annual fees for using some wireless frequency ranges.
As we all know that anything in the world has advantages and disadvantages.
The advantages of the wireless fire alarms are:
- They are easy installation systems.
- They require no cabling or pipes for installation.
- And of course they have no infrastructure maintenance as there are no cables or pipes.
The disadvantages of the wireless fire alarms are:
- Interference with other electromagnetic wireless waves (some electromagnetic noise may interfere with the original signal), it is measured by the signal to noise ratio (S/N), if the ratio is less than a certain value you shouldn’t use wireless fire alarms as it will not be the suitable solution for the given application.
- In steel applications you cannot use wireless fire alarms as the electromagnetic wireless waves cannot propagate in metal application.
- Typical wireless fire alarm system parts is very expensive when compared to the normal fire alarm system that uses cables, but you also will save the installation work cost for laying cables inside pipes.
The significant disadvantage of wireless fire alarm system is the wave distortion which will make actual fire signal do not reach the fire alarm control panel or it will reach the panel with distortion that will not be identified as an alarm signal.
Here is a typical fire alarm signal sine wave and the distorted alarm wave after noise interference.
If your application has no limitations and accepts both systems (wireless fire alarms & conventional cabled fire alarm system) you should make a cost study which system is cheaper to implement as both systems provide you the same function.
In the wireless fire alarm system all system parts are connected to the main fire alarm control panel individually not a loop connection,
Wireless fire alarms usually use the frequency around 800 MHz which you have to check with your local authorities about the availability of using this frequency range.
All of the fire alarm system parts are addressable points; each point is configured individually and programmed to the extreme detail you need.
If you need more information in how to design a wireless fire alarm system and want to know the analysis of the fire alarm wave propagation & fire alarm antenna types, Purchase this fire alarm training course: