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Servoflo Corp.: Capacitance-Based Pressure Sensors

November 10, 2008
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The capacitance-based pressure sensor line by Alpha Instruments measures from 0.1-100 inches of water column (wc). All models have a bidirectional version, making them well suited for applications where two directions of pressure need to be measured, says the company. The sensors come in a variety of package styles, including PC board mount, NEMA 1, NEMA 4, and din rail mounting type. Outputs of the sensors include 0-5V, 0-10V, or 4-20 mA. According to the manufacturer, in the voltage version, true zero can be achieved. Some units can be temperature-compensated to 0.01 percent of full-scale per °F. The accuracy varies from 0.25-2 percent at room temperature. The sensors have a calibration method that allows users to have special pressure ranges for certain applications. For example, it is possible to create a range of -0.5 inches wc to +3.5 inches wc. Typical applications include HVAC applications, duct measurement, clean room control, fume hoods, critical containment enclosures, isolation rooms, and other building management applications.

Servoflo Corp., 75 Allen St., Lexington, MA 02421; 781-862-9572 or 866-830-9572; 781-862-9244 (fax); info@servoflo.com; www.servoflo.com

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