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Main applications
These miniature slow-action air switches are particularly effective for long-distance control systems, where they greatly outperform models using snap-action switches. They are designed to be incorporated into a printed circuit board which provides power relay and the latching function. They are used for controlling circulating pump motors in spas and swimming pools, counter-current swimming pumps, air blowers motors, as well as for lighting control. Its reduced thickness of 15mm favors its installation in applications requiring a small footprint. They feature in standard a patented barometric and thermometric compensation system to prevent unwanted tripping.

Technical features

Fluid: Air only

Pressure port connection: Plastic spout

- For ⅛” (3mm) ID flexible plastic tubing

- For 1/16” (1.5 mm) ID flexible plastic tubing

Maximum PVC tube hardness 70 shore A

Membrane: Silicone, 22mm diameter.

Housing: PA66

Contact: Slow make and break, closes on pressure rise.

Electrical rating: 1A 250VAC resistive (silver contacts), 10mA 24VDC (5 microns gold plated contacts). We recommend gold plated contacts for low voltage and low current circuits to avoid the increase in contact resistance that appears on silver contacts as they oxidize.

Action: Momentary: the contact switch on when pressure rises, and switch off when pressure decreases.

Electrical connection: 2.8 × 0.5mm quick connection terminal or 1.2 × 0.5mm tin welding terminal

Maximum operating pressure: 90 kPa (900 mbar, 13 PSI)

Ambient temperature limits: Air: -10 ~ 85°C (14 to 185°F).

Barometric compensation: Calibrated flow leak orifice inside the pressure chamber

Mounting fittings: ¼” NPSM thread with 11mm distance flats, for installation through a board, or side spout.

Switch operation: Operates on a sealed pressure air displacement, with patented calibrated micro-leak providing barometric and temperature compensation.

Caution: Use air transmitters with enough air volume to achieve minimum operating pressure. Too long connection tubes and/or too small pressure transmitter will not operate the air switch.

Accessories, in option or available as spare parts: ABS plastic nut (Maximum tightening torque 1.5 Nm) and tube securing nut (Maximum tightening torque 2 Nm).