The VSR-F and VS-F models are paddle-type water flow indicators used in wet sprinkler systems, registered with U.L. in the United States, certified by F.M., and approved by L.P.C. in the United Kingdom. They are designed for standard #10 to #40 steel pipes, with specifications ranging from 50mm to 200mm.

This device can also be used as a diverter switch in large systems.

The VSR-F water flow indicator includes two sets of single-pole double-throw time-delay adjustment switches. The activation time is adjustable, and the knob for adjusting the delay can be rotated in both clockwise and counterclockwise directions. When a flow rate of 37.8 liters per minute or higher impacts the paddle of this indicator, the paddle deflects in the direction of the water flow, and the timer begins counting. If the paddle remains deflected and cannot return to its original position after reaching the set delay time, the water flow indicator immediately outputs a signal.

Note:
1. The VS-F model is a water flow indicator without a time-delay adjustment device, available for user selection.
2. The brand of this product is POTTER.