The model FSFD was developed to detect the water flow in wet sprinkler systems once the sprinkler has been triggered. The flow switch is fitted with a pneumatic time delay mechanism that can be set from 0 … 70 seconds via an adjustment dial to avoid false alarms during water surges.

The tamper-proof screws on the cover prevent unauthorised access to the switch point setting. The robust design, with IP56/NEMA4 ingress protection, is suitable for indoor and outdoor applications. For error-free installation, the direction of flow is indicated on the case and on the saddle.

The model FSFD has two cable duct openings for two sets of SPDT switches (form C) in a fused terminal block, which provides a direct electrical connection to control panels and local audible warnings.

Since the flow switch is designed for pipe sizes from 2 … 8″ in various pipe schedules, it provides a complete solution for construction projects.

The model FSFD has been designed for improved sensitivity
and repeatability of the switch point and has UL and FM certifications.