All Redetec part numbers beginning with ‘P’ use Apollo Optical Point Detection and all models beginning with ‘V’ utilise Airsense HSSD (High Sensitivity Smoke Detection).
The main difference is that HSSD provides phenomenal response to detecting smoke within high airflow environments. HSSD continuously samples air from various points within the cabinet. It is can detect incipient stages of combustion within a server cabinet. With standard detection you would need much more smoke to be generated in order to trigger.
HSSD is typically set to a level 10x more sensitive than the standard detection as default. The typical Sensitivity range of HSSD is 0.03% to 25% obs/m (obscuration per meter). The typical Sensitivity range of Point Detection is 3.5% – 5.0% obs/m (obscuration per meter).
The smoke from the smoldering stage of a fire is typically made up of large combustion particle, between 0.3 and 10.0 µm, and this is what obscures the detector. The sensitivity on an HSSD can be adjusted via a laptop to be more or less sensitive based on the environment. The sensitivity on a Point detector is fixed with no further adjustment.