Appliance Design - February 2008 - (Page 31) CONTROLS & SENSORS 12. Non-contact design. 13. Does not use permanent magnets. Exhibits no sensitivity to heat and no drift over time. 14. Economical design. 15. Can also be used to detect motor shaft run out/bearing run-out. 16. Both absolute and incremental position output options. 17. Temperature operating range of –110 DegC to 450/650 DegC operability. 18. Rotational speed acceleration and de-acceleration. 19. No induced magnetic field. 20. Can be used as rev-limiters or governors. 21. Ramp up speed and braking abilities are inherent in this sensor. In addition to those benefits, the system integration of the digital sensor technology can provide more. When implementing the technology, the controller does not require a particular bus (PCI, Ethernet, USB, RS232, ISA, etc). The controller does not require any input filters, sample-and-hold circuitry, or translation hardware (A/D Converters, serial-to-parallel converters, level shifters, etc). No special interface IC’s, or amplifier boards, or required software tools or languages are needed. Benefits on the component side include the ability to measure small physical changes very accurately; robust temperature operability ranges of –60 DegC to 650 DegC; the elimination of magnets and/or ferrites (in inductive designs); the ability to utilize novel targets and target materials, and the ability to gather secondary data for health monitoring and predictive maintenance. Benefits on the systems level side include the Digital Signal Transfer Methodology itself; the associated hardware cost reductions (wire, cable, targets, etc.), possible manufacturing process changes and reduction in circuit board space; and positive interface and common bus options. Digital sensor technology, therefore, represents a clear and fundamental shift forward on both the component and systems levels. < For more information, enter . . . . . . . . . . . . . . . . . . . . . . . . 303 Or email: sales@inproxsensors .com Problem: Find a small footprint thermal control with big range. Appliance project Another potential application for the technology can be realized in the home appliance industry, where the sensors can be used in ovens to detect the position of racks in the self-cleaning cycle. In this case, a change in the integral of dielectric in the field created by the sensor transducer changes reactance in the transducer and thus the frequency. ITC has developed a patent-pending sensor array for the cooking appliance market that can be embedded directly in most oven walls; providing a position measurement that operates up to 450 DegC and survives up to 600 DegC. The sensor array can be flush mounted within the oven’s inner cavity and detect an interior rack in any position for self-cleaning cycle monitoring. It is also possible to provide color matching between the sensors and the oven walls to make them invisible to the consumers. Solution: Small. Reliable. Proven. The creepaction PEPI Model A brings a unique versatility to everything from hairsetters to heating pads. Preset calibrations can range from 5 - 200°C so many companies use it on different applications. When it comes to combining cost, size and range, the Model A has done it all. Only Pepi® thermostats and thermal protectors offer so many options in fit, configuration, cost and customization. For a close look send for our new 2006 Disc-Type and Conductive-Type Catalogs today. Conclusion Previous generations of analog devices and analog measurements have long been the standard of most industries. The costs of discrete components and signal conditioning electronics can be re-distributed in the digital approach on to the lower cost metrics of software. www.applianceDESIGN.com AD02084Port.indd 1 www.pepiusa.com Portage Electric Products, Inc. N. Canton, OH U.S.A. salesinfo@pepiusa.com • 1-888-GO4-PEPI For more Information Enter 112 applianceDESIGN February 2008 31 1/17/08 9:34:33 AM http://www.pepiusa.com http://www.pepiusa.com http://www.appliancedesign.com
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