LVDT Valve Position

• LVDT position sensors from NewTek Sensor Solutions measure the linear position of a specific object
• LVDTs are rugged sensors with no moving parts, so they are resistant to friction, high temperature, and high pressure
• The core rod of an LVDT connects to a mechanical indicator, which moves the core within the linear position sensor and changes the output proportionally to the position of the core, thus giving a measurement of position

A Linear Variable Differential Transformer (LVDT) is common type of position sensor that converts the linear position or motion of a measured object to a proportional electrical output that can be read by operators and control systems. So, using these sensors for LVDT valve position measurement offers highly repeatable, rugged solutions for many applications.

In practice, these sensors can be employed in a wide range of applications and environments. Since LVDTs can withstand harsh environments, they can operate without interruption for years or even decades. Linear position sensors offer a high resistance to dust, dirt, water, debris, and extreme temperatures. So, these sensors are ideal for industrial areas, power generation plants, chemical processing plants, pulp & paper, and other environments where ruggedness and reliability are key.

Linear Variable Differential Transformers from NewTek Sensor Solutions

But these sensors are not only for heavy industrial environments. NewTek LVDTs are also precise enough for laboratory use. With sub-micron resolution and 0.25% maximum non-linearity, extremely small changes in position can be measured accurately. Since there are no moving parts, the LVDTs mechanical life is infinite and there is no inaccuracy due to friction or stiction. Ideal for materials testing, actuator feedback, and gauging, these LVDTs can perform reliably in both the laboratory and the factory floor.

NewTek LVDTs are most frequently used where measuring ranges vary from ±0.010 inches (±0.254 mm) to ±10 inches (±254 mm). Additionally, LVDTs can be designed for temperatures from cryogenic ranges -238°F (-150°C) to as high as 1000°F (537°C). The LVDT features frictionless operation and is very rugged in harsh environments. Also, LVDT position sensors possess excellent accuracy and repeatability, and has a near-infinite expected service life.

Measurement with LVDT Valve Position Technology

See how an LVDT can be used to monitor the position of a gate valve. Typically, the LVDT housing will be mounted in a fixed location. The LVDT core rod should be connected to the valve’s mechanical indicator. So, as the mechanical indicator moves, the LVDTs core also moves within the LVDT. This movement changes its output proportionally to the position of the core.