The VDRT waterflow detector shall be used in wet pipe fire sprinkler systems only. It shall not be used as sole initiating device in both deluge and pre-action systems. Any misuse in either deluge system or pre-action systems may result in an unintended discharge caused by a surge, trapped air or a short retard time.
Be sure the direction of flow and directional cover point in the correct direction or else water flow will go unreported. See FIGURE 2 and FIGURE 3.
