![]() They are often constructed with stainless steel housings such that they are resistant to damage by vandals or heavy use. Another advantage is that they may easily be completely sealed from the environment and thus made weatherproof. This means the lifetime of such a switch can be ensured to be tens of millions of operations, since there is no wear involved. One is that there are no moving parts, just the small deformation on the front plate and the piezo element (typically a few micrometers). Piezo switches have some interesting advantages over their conventional mechanical counterparts. With additional circuitry this pulse can be extended further or used to change the state of an output from steady "Off" to steady "On" by toggling a flip-flop. A capacitor may be used to store the charge to lengthen the time constant of the gate circuit and therefore the width of the pulse. This pulse can vary with the amount of pressure which is applied, since higher pressures generate higher voltages which take longer to dissipate. Thus piezo switches produce a single, brief "on" pulse. When a mechanical force or pressure is applied to the switch, it deforms the piezoelectric material, which generates an electric charge. ![]() In the case of piezo switches, the force could be compressive pressure that causes the (typically disc-shaped) piezo element to bend very slightly like a drumhead. The piezoelectric effect is the generation of electric charge when certain materials are under stress. After the voltage pulse is dissipated in the gate resistor, the FET turns back "off", its normal high impedance state. When the FET is on, current can flow through it as with a conventional metal contact-based switch. The charge generated by the piezoelectric element in the switch is typically used to turn on an integrated semiconductor device such as a field effect transistor (FET), causing the switch assembly's output to be active, or "on". ![]() Custom colours, specific materials, special backlighting or varied shapes are available upon request. Particular attention is paid to the cosmetic appearances of our products to best match your requirements, from specific markings to brightness illumination for outdoor applications.īy controlling all phases of manufacturing and quality control, APEM products offer the ability to withstand the adverse elements associated with harsh environments, without affecting their life expectancy.A piezo switch is an electrical switch based on the piezoelectric effect. This variety of components allows them to create the unique combination to match your design. This technical expertise ensures the continuous growth of our product ranges, allowing strong partnerships with our customers and providing the necessary flexibility to create an infinite number of products.ĪPEM offers a range of more than 50,000 customisable part numbers: colour, marking, finish, shape and dimensions… unlimited combinations are possible. With a vertically integrated production, and controls all stages of product development and production: from tooling, moulding, screw machining to assembly and final inspection.ĪPEM’s dedication and experienced teams can respond to the most complex requirements. From Push buttons, Rockers, Toggles, LED indicators, Emergency Stops to Joysticks and keypads.ĪPEM develops and manufactures professional switch products for diversified markets including instrumentation, medical, communications, industrial automation, defence and transport. APEM offers a broad selection of quality products with proven effectiveness in harsh environments. MAIN FEATURES of the PBA Series 16, 19 or 22mm Piezo switchĬontrol Devices is the official APEM distributor for Australia and New Zealand. A piezo switch is a type of touch switch that relies on the piezoelectric effect to open and close its circuits. Sealed to IP68 or IP69K, easy to clean metal surface, long life (50 million cycles), ring illumination, custom configurations. The screw-machined metal housing construction and APEM’s vertical integration allow for the manufacture of a variety of shapes.ĪPEM PBA Series 16, 19 or 22mm Piezo switch is part of the PBA series including models with diameter 16, 19 or 22 mm bushing. High performance sealing (IP68 and IP69K) is achieved due to the one-piece construction of the switch. The flat actuation surface is completely closed, preventing the intrusion of liquids or other contaminants, perfect for surface cleaning required in the medical and food-processing industries. ![]()
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