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Sensors/MEMS??

LVDTs withstand high temperature, mild radiation

Posted: 17 May 2007 ?? ?Print Version ?Bookmark and Share

Keywords:linear position sensors? high-temperature mild-radiation environment? hermetically sealed LVDTs?

Macro Sensors' HSTAR 750 series

Macro Sensors' HSTAR 750 series of 3.75-inch (19mm) diameter AC-operated LVDTs are hermetically sealed, stainless steel sensors intended for use in environments with high temperatures (400F) or mild radiation exposure. The units withstand mild radiation at 3x107 Rads for 40 years. HSTAR linear position sensors are ideal for use in radiation resistant robots, beam scraper positioning feedback, nuclear steam valve positioning and power generation applications.

Available in ranges of ?0.050-inch (?1.25mm) to ?10-inches (?250mm), the HSTAR 750 series sensors feature high resolution, excellent repeatability and low hysteresis functions associated with LVDT technology, as well as the highest sensitivity consistent with good linearity. The maximum linearity error for any of these sensors is ?0.25 percent of full range output using a statistically best-fit straight line derived by the least squares method.

Electrical termination of the HSTAR 750 series is made through a sealed radial connector located near one end. The mating connector plug is supplied with the unit.

A radially-mounted electrical connector permits through-bore operation produces key significant results. First, the LVDTs are accessible from both ends, permitting much better mechanical support and core guidance than with blind-bore hermetically sealed units. Next, the coil windings are sealed against hostile environments to IEC standard IP-68 and electrical termination is through a sealed radial connector located near one end. Open at both ends, the LVDTs can be easily cleaned of grit, dirt, dust or other contaminants for greater reliability and longer life. Finally, the radial connector makes the installed length of the HSAR LVDTs at least 2-inch shorter than comparable units with an axially mounted connector for easier installation in tight spaces.

Macro Sensors offers several standard options that permit a user to customize HSTAR 750 LVDTs, including metric threaded cores, as well as smaller diameter and low mass cores. The company can also provide a range of mounting accessories and core extension rods. On special order, the HSTAR 750 series can be constructed for immersion in pressurized fluids.

All HSTAR 750 series LVDTs will operate properly with any conventional differential input LVDT signal conditioner, said Macro Sensors. Ranges of 1-inch or greater will also work with ratiometric LVDT signal conditioning.




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