AC-LVDTs serve as alternatives to magnetostrictive sensors

June 27, 2023

NewTek AC-operated LVDT position sensors often serve as a more reliable, precise and cost-effective alternative to magnetostrictive linear position sensors in the monitoring and control of valves in power generation and hydroelectrical stations. Because power generation environments can reach temperatures of 250°C (475°F), magnetostrictive technology might fail or become inaccurate over time. While very accurate in benign applications, most magnetostrictive sensors cannot operate over 85°C as electronics must be placed very close to the wand.

With electronics separated from the LVDT coils, NewTek’s AC-operated linear position sensors continuously operate in power generation stations without failure at high temperatures. While the LVDT sensor remains in a harsher environment, NewTek’s NTC-6000 LVDT Signal Conditioner (which excites the AC-operated LVDT and provides a variety of output options for use in PLCS and other control systems) operates in a less innocuous environment. By using a low operating frequency range between 2kHz to 4 kHz, the LVDT and signal conditioning are separable by 100 feet or higher.

With attributes such as frictionless measurement, infinite mechanical life, excellent repeatability and good temperature stability over extended temperature ranges, NewTek AC-operated LVDT position sensors are the ideal linear position technology for valve applications. They provide both short and long stroke measurements, typically from 4 inches to 20 inches.

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