The S+S Regeltechnik WFS-1E is a robust mechanical vane switch, also known as a paddle switch, designed for reliable air flow monitoring in HVAC (Heating, Ventilation, and Air Conditioning) systems. It operates on a simple yet effective principle: a stainless steel paddle is deflected by the force of moving air, which in turn actuates a built-in microswitch. This provides a direct electrical output for flow/no-flow status, making it ideal for flow control or alarm applications.

The device is engineered for use with gaseous, non-aggressive media and is specifically suited for applications involving contaminated or oily air, such as in industrial exhaust systems. Its key application areas include monitoring flow in air conditioning ducts, verifying operation of air intake or exhaust devices in ventilators, and ensuring proper airflow in electric heating registers to prevent overheating.

Constructed with an impact-resistant plastic housing and a durable stainless steel paddle, the WFS-1E is rated IP65, offering reliable protection against dust ingress and low-pressure water jets, suitable for demanding indoor environments. The built-in microswitch provides a single changeover contact (SPDT) with a screw terminal connection for easy integration into control circuits. An ATEX-certified version (CP.Ex-WFS-1E) is also available for use in potentially explosive atmospheres.

Specifications

• Switch-on Value (approx.): 2.5 m/s
• Electrical Connection: Screw terminal
• Operating Temperature: -20°C to +80°C (typical)
• Storage Temperature: -40°C to +85°C
• Dimensions (WxHxD): 140x62x65 mm
• Net Weight: Approx. 0.55 kg
• Gross Weight (incl. package): 576 g
• Country of Origin: Germany

Typical Applications

The WFS-1E is ideal for flow monitoring in HVAC systems, ventilation ducts, air handling units, dust extraction systems, cooling towers, and any application requiring reliable airflow confirmation for process control or equipment protection.