MTS Series 248 Actuators - Manual (Page 18)

Series 248 Actuator Product Information 18
About LVDT Operation
Introduction
About LVDT Operation
The internally mounted LVDT provides an indication of the actuator piston rod
displacement.
The LVDT is an electromechanical device that provides an output voltage which
is proportional to the displacement of a moveable core extension. The core
extension is mounted inside the hollow piston rod and moves as the piston rod
moves. The LVDT coil is secured to the pedestal base. The core extension is
positioned in the LVDT coil to provide a zero reference point (usually mid-
displacement of the actuator’s full-scale displacement), and is locked in place
with a locking setscrew.
As the piston rod moves during operation, the output voltage from the LVDT
indicates how far the piston rod has moved from the zero reference point.
Adjusting Wrench
(raises or lowers
core mount)
Core Mount
Locking
Screw
LVDT Core
Extension
Hollow
Piston Rod
LVDT Coil
Pedestal
Base
LVDT
Connector
Hex Wrench
Core Mount
O-Rings