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EETE APR 2015

Online Catalog or Download SoftCenter® Mu-Metal Magnetic Screening Highest Grade Reed Switches New 3V Versions Leaders in Reed Relays Product Selector Tech. Guide 2 Former-less Coil Winding All our Reed Relays are constructed using our SoftCenter® technology, which uses a soft inner material to reduce stresses on the reed switch. In addition, contact life and more reliable contact resistance are achieved by our use of Former-less coil winding. Our Former-less coils are manufactured using a fully automated process that provides consistent output quality and repeatability. So what is Former-less Coil Winding and what advantages does it give you? Typical Pickering Construction using Former-less Coils and our SoftCenter® technology Encapsulation Shell Internal mu-metal magnetic screen permitting high packing density without magnetic interaction Former-less Delicate glass/metal operating coil reed switch seal. Must be protected Diode SoftCenter® Internal mu-metal magnetic screen Instrumentation grade reed switch Hard outer encapsulation material Soft inner encapsulation material to protect reed switch Diode Conventional Bobbin Construction Reed switch Self supporting coil to maximise magnetic drive Encapsulation Shell Very hard moulding material Coil winding Coil supporting bobbin, wastes space and reduces magnetic drive Diode Pickering Former-less Coil Construction Dispensing with the supporting bobbin increases the coil winding room by up to 50%, greatly improving magnetic efficiency. Looking at the above diagram you can see that former-less winding greatly increases the winding ‘window’, providing the following advantages: • A much higher magnetic drive level and better magnetic coupling as the smaller diameter of the inner turns are more efficient (more turns per Ohm). • The number of Ampere Turns (AT) is increased - Reed switches are usually rated in sensitivity by an Ampere Turn number, for example, an AT rating of 15AT is twice as sensitive as one with a 30AT. Because the 30AT switch needs more magnetic drive there is much more ‘restoring force’, which is the ability to open when the coil drive is turned off. This in turn extends the working life of the reed switch many times. pickeringrelay.com Scan the QR code to go to our website.


EETE APR 2015
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