FAV Series Adjustable Flow Monitor

FAV flow switch: flexible monitoring for gas and liquid

The FAV flow switch is specifically developed for applications where a fixed switch point is not sufficient and fine adjustment in the field is necessary. Thanks to the internal spring preload, the monitor can be set accurately to detect both an increase (high flow) and a decrease (low flow) in flow.

Why choose the FAV series?

The FAV flow switch excels in environments where process parameters can vary. The robust construction and hermetic separation between medium and electronics make it suitable for:

• Process control: accurate monitoring of liquid flows in plants.
• Hydraulic lifts: checking the correct oil flow for safe operation.
• Water treatment: flow-based dosing of chemicals.
• Fire protection systems: reliable detection of water movement.

Operation of the FAV adjustable flow monitor

The FAV series uses a spring-assisted magnetic piston:

1. Flow activation: as flow increases, the magnetic piston is pushed against a spring.
2. Variable setting: as soon as the magnet reaches the position of the adjustable reed switch, switching takes place.
3. Deactivation: as flow decreases, the spring pushes the piston back, deactivating the switch. On average this happens at a flow 40% lower than the actuation point (reset value).

Technical specifications FAV series

Installation and custom work

The FAV flow switch can be mounted both vertically and horizontally. Note: the orientation affects the adjustment range; for the most accurate results and consistency, a 100 micron filter is recommended to prevent contamination of the internal spring and piston.

For questions about chemical resistance or specific gas curves, you can always contact us or consult the website of manufacturer ChemTec.