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Position sensors operate in harsh environments

Posted: 29 May 2006 ?? ?Print Version ?Bookmark and Share

Keywords:HSE/HSER 750? position sensor? LVDT? Macro Sensors? Gina Roos?

HSE/HSER 750 series of position sensors

Macro Sensors offers a family of rugged, hermetically-sealed, DC-operated LVDT position sensors for general industrial use. Enclosed in a heavy wall, stainless steel housing, the HSE/HSER 750 series of 3/4-inch diameter DC-operated LVDTs are said to be impervious to dirt, water, steam and other corrosive elements. This makes them suitable for use in hydraulic cylinder positioning, valve position sensing, automatic assembly equipment and other industrial applications in harsh environments.

Available in a range of 2.5 mm to 500 mm, the HSE/HSER 750 series LVDTs feature high resolution, excellent repeatability (repeatability error is less than 0.01 percent of FSO), and low hysteresis (hysteresis error is less than &plusmn0.01 percent of FSO). Standard maximum linearity error for any of these DC-operated sensors is 0.25 percent of full-scale output using a statistically best-fit straight line derived by the least squares method, according to the company. A linearity error of less than or equal to 0.10 percent of full-scale output is available as an option.

Operating from 24Vdc (nominal) or 15Vdc to 24Vdc 10 percent, 30mA (nominal), the HSE/HSER series 750 LVDTs offer a full-scale output from 0 to 10Vdc. The operating temperature range is -20C to 70C). Units are qualified at pressures up to 1,000psi and are suitable for a variety of high-pressure applications.

A single-ended LVDT, the position sensors terminate through a sealed axial connector that prohibits the core from passing completely through the coil assembly. Electrical termination for the HSER series 750 DC-LVDTs is made through a sealed radial connector located near one end. The radial connector offers a through-bore design that permits access to either ends of the LVDT's core for better mechanical support and core guidance, and easier cleanout, said the company. The radial connector also offers a shorter installed length, compared to units of the same range with axial connectors.

Incorporating built-in electronics, both the HSE/HSER 750 series 750 sensors provide the desirable features of an AC-LVDT, such as frictionless operation and dynamic response, with DC input and pre-calibrated DC output. Units operate in conjunction with PLCs, digital indicators, ADCs, computer-based data processors and QC data collection systems. The sensor's coil windings are sealed against hostile environments to IEC standard IP-68.

Several standard options are available that allow for customization of the HSE/HSER series 750 LVDTs. These include Teflon bore liners, metric threaded cores, mounting accessories, core extension rods and DC power supplies. A mating connector plug is supplied with every unit.

Pricing for the HSE/HSER 750 devices starts at $536 with quantity discounts. Delivery is from stock.

- Gina Roos

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