NewTek vented linear position sensors

NewTek Sensor Solutions’ vented M-375 Series of Linear Variable Differential Transformers (LVDTs) are designed for hydraulic cylinders to measure position and monitor the pistons. The company said this function helps prevent piston over-extension or under-extension, ensuring safe and high-precision operation.

In industrial automation applications, these miniature AC-operated sensors provide feedback on cylinder positions, facilitating accurate control in manufacturing lines and injection molding machines. In power plants, the LVDTs enable precise movement of hydraulic cylinders that manage various gates and valves throughout the facility.

NewTek’s vented M-375 Linear Variable Differential Transformers (LVDTs) are used in hydraulic cylinders to measure the position of pistons. (Photo collage: NewTek)

In addition, vented LVDTs are employed in hydraulic actuators used on drilling equipment for oil and gas exploration for monitoring ground deformation during extraction. They are also used in materials testing applications within test chambers to measure deformation of samples and in geological and asphalt/concrete testing to evaluate deformation resistance.

Designed to endure harsh environments and the high pressures typical of hydraulic systems, NewTek’s vented M-375 LVDTs are suitable for demanding hydraulic cylinder applications. The vented design equalizes pressure between the internal and external environments. This capability allows the sensor to operate in temperature extremes of -65°F to +400°F (-54°C to +204°C).

The vent also compensates for pressure changes within the hydraulic cylinder or its surrounding area, enabling dependable operations at pressures of up to 30,000 psi. The vented design helps maintain consistent internal conditions, protecting sensor components and increasing service life, while simultaneously reducing the likelihood of failure, said NewTek.

By operating without physical contact between the sensing elements and the piston, the LVDT’s non-contacting measurement ensures accurate output while minimizing wear and tear on components, said NewTek. With a lightweight, low-mass core and 3/8 in. diameter, the sensors are ideal for high-response dynamic measurement required in hydraulic systems with tight spaces and weight constraints.

The NewTek M-375 Series transducers are available in ranges from ± 0.025 inch (± 0.63 mm) to ± 2.0 inch (±50 mm) and feature a non-linearity of ±0.25% full range max. They are made in the United States.

The company said they are compatible with any conventional differential input LVDT signal conditioner, such as the NTC-6000 Qwik-Cal signal conditioner, which pairs with AC-operated LVDTs to deliver reliable feedback in DC voltage, current and digital outputs including RS-485.