THERMOSTICK VLS, VESDA Laser Scanner

The VESDA VLS is similar to the standard VESDA VLP detector, but it also includes a valve mechanism in the inlet manifold and software to control airflow from the four sectors (tubes). This configuration allows a single VESDA zone to be divided into four separate sectors, distinguishing, for example, between separate spaces within a room. The VLS draws air from all sectors in use. If the smoke level reaches the adaptive scan threshold, the VLS quickly scans each tube to identify which tube carries smoke. If more than one pipe carries smoke, the sector with the highest smoke concentration is designated as the First Alarm Sector (FAS). Once the Quick Scan is completed and the FAS has been identified, the VLS continues to closely monitor all four sectors (pipes) to monitor the growth of the fire and maintain full protection of the area. Four alarm levels (Alert, Action, Fire 1 and Fire 2) are available for each sector (tube), and the sensitivity for each alarm level can be set to ensure that the optimal alarm thresholds are applied for each sector.