Differential Pressure Switches Series SFS

About Differential Pressure Switches Series SFS

Differential Pressure Switches Series SFS

MAIN CHARACTERISTICS : The SFS differential pressure switch closes or diverts an electric contact when the differential pressure between the two inlets reaches the upper set-point (intervention) and opens or releases the contact when it drops below the lower set-point (release). It can be used in plumbing systems when it is necessary to make sure the pressure difference between two point dose not exceed or drop below a specific valve. A pair of permanent magnets, placed in a mutual-repulsion position one inside the pressure switch body and one outside, replace the classic O-ring and shaft solution and greatly increase the reliability and working life of the pressure switch.

OPERATING PRINCIPLE The difference in pressure that is generated, p=p1-p2, moves a diaphragm that pulls a small cap containing a permanent magnet. Diaphragm movement is obstructed by antagonist springs which are sized depending on the intervention characteristics specific to the pressure switch (see tab.1).Another magnet is in the microswitch drive piston. Whenever the pressure difference p reaches the intervention valve, the diaphragm movement will approach the two magnets to a distance where their mutual repulsion force is greater than the tripping force of the microswitch push-button and this will cause switching to take place (Fig.2). When the pressure difference p decreases and drops below the return valve, the two magnets move away from each other and the microswitch push-button returns to its normal position (Fig.1).

ELECTRICAL CHARACTERISTICS All versions are available with one or two micro switches. SPDT MICRO SWITCH: UL, CSA, SFV, VDE, SEMKO and BEAB approvals. Fast-on 6, 3 mm connections; 10 (3) A 250 Vac. MICRO SWITCH BOX AND CABLE: IP 40 and IP54 (max. 2 micro switches) European Standard Reference CEl EN 60529. The IP40 version with one micro switch are supplied with a standard two-pole cable measuring 650 mm (single-pole micro switch: connection C-NO). The version with two micro switches is supplied without cable. The IP54 version is available only with cable, as internal access is not possible.

 

 

Reliable Differential Pressure Monitoring

Series SFS pressure switches deliver consistent monitoring for adjustable pressures between 20 and 3000 Pa. The use of a stainless steel contact disc and a mechanical microswitch ensures dependable performance and high accuracy, making it ideal for sensitive control systems in ventilation and filtration.


Versatile Mounting and Easy Integration

Choose between surface and duct mounting, accommodating diverse installation needs in industrial and commercial settings. The device is provided with hose nipples for quick tube connection, and supports both 6 mm and 8 mm port sizes for compatibility with existing systems.


Built for Endurance and Safety

Engineered with rugged plastic housing and double insulation (Class II), the SFS switch guarantees over one million operations, offering outstanding service life and reduced maintenance costs. Its CE certification further underlines adherence to safety and quality standards.