PG Series LVDT Linear Position Sensors

Also Ideal For Other Heavy Duty Linear Position Sensing Applications

The Everight PG Series linear sensors are LVDT-based valve position sensors designed and engineered specifically for applications in electric power generating steam turbine control systems. Many features of the Everight PG Sensors were actually requested by power gen controls engineers. PG models include the PGHD Heavy Duty LVDT and the PGSD Super Duty LVDT. PG Series sensors are available in full ranges of 3 inches (75 mm), 6 inches (150 mm), 9 inches (230 mm), 12 inches (305 mm), and 15 inches (380 mm). Both versions are available with mild radiation resistant certified LVDTs for operation in BWR nuclear power plants.

Everight PG Series Linear Sensors solve an underlying problem with LVDTs found in power gen applications that results from the fact that the typical AC-LVDT sensors currently used for valve position sensing on steam turbines were never really designed for that type of physically demanding use. They were originally designed for more benign applications such as factory automation equipment. The LVDTs mounted on a steam turbine get stepped on, have heavy things dropped on them, are subjected to jets of live steam, etc. Unlike the ordinary LVDTs now in service, the PG series can take this kind of abuse for years on end, providing a new level of reliability in such a rough application, and at costs comparable to typical LVDTs currently in use.

Starting with an aerospace quality LVDT, everything about an Everight PG Series linear sensor is heavy duty, from the wire connection terminal block inside an IP-68 sealed housing to the 3/8 inch outside diameter core rod in which the LVDT’s core is encased so that it can never vibrate loose, break off, or fall away. An in-line ball joint is available on the connecting rod to take up installation misalignment, and two double contact shaft seals keep dirt and grit out of the sensor’s bore. The wall thickness of the sensor’s housing is from ten and to twenty times as thick as that of typical power gen AC-LVDTs. Electrical connections use Euro-style screw-clamp-type terminals for any size wire from No. 24 to No. 14 AWG, eliminating the nuisance of soldering to misfit connectors. Electrical cables pass through a 3/4 inch conduit hub with a removable 1/2 inch conduit adapter installed that accepts liquid tight connectors, cord grips, flexible conduit fittings, or, where an application warrants, a suitable connector.

There has never before been a product like Everight’s PG Series LVDT linear sensors for power gen use. Designed and engineered to survive long term in the rough environment of the steam turbine deck, PG series LVDTs bring a new level of confidence and reliability to this application.