Construction on the LVDTs includes a 3/4 in.-diameter stainless steel housing with windings potted inside the housing with a two-component epoxy to provide excellent protection against hostile environments. They are available in ranges of ±0.05 in. (1.27 mm) to ±10 in. (250 mm).
HAR-Series LVDTs offer contactless measurement in a wide temperature range of –65°F to 275°F. A high-temperature IP-68 version of this AC-LVDT is available in the HATR-750 Series, which tolerates temperature ranges of –65°F to 400°F. The sensors also feature a radial connector that reduces housing length so units fit into tight spaces. Both series withstand vibrations of 20 g to 2 KHz with shock survival of 1,000 g, 11ms.
Providing feedback on turbine shell expansion, these sensors give operators the measurements needed to determine the thermal growth of steam turbines as the shell expands during startup, operation, and shutdown. These measurements help identify whether dimensions exceed expected temperature growth differentials. In addition, when installed on various locations on a steam turbine, the HAR-Series hermetically sealed position sensors monitor bearing vibration to detect bearing clearance limits that indicate bearing wear.
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