Fire Suppression design

Designing the fire detection, for a fire suppression system is similar to what would be required for a standard building fire alarm system.
When designing a fire suppression system, the type of detector to use used is as follows:
The selection of detectors of the fire alarm panel should be in accordance with the recommendations given in BS 5839-1 and, where applicable, BS 6266.
In some circumstances, fire detection considerations might dictate the
need for use of two different principles of detection (e.g. optical smoke
detectors and ionization chamber smoke detectors) to ensure the
earliest warning of fire and give the fire suppression system the maximum amount of time to extinguish the fire. In such circumstances, an even distribution of each type of detector should be provided throughout the protected
space. Where coincidence is used, normally it should be possible to
achieve coincidence from two detectors of the same operating
principle. In these cases, if, for example, two independent circuits are
used to achieve coincidence, there should normally be an approximately equal number of detectors of each principle connected to each of the independent circuits. For example, where four detectors are required to protect the space and these comprise two optical smoke detectors and two ionization chamber smoke detectors, there should be one optical smoke detector and one ionization chamber smoke detector on each circuit.
However, it is not always necessary to use two different principles of
fire detection. For example, given the type of fire anticipated and the
speed of detection required, it might be acceptable to use detectors of a single type.
See a video of a Fire suppression system in action.