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Macro Sensors offers the HSTA and HSTAR series of LVDT-based linear position sensors that feature shortened body length and environmental resistance ideal for hydraulic applications.

Position feedback devices are commonly implemented in hydraulic applications to monitor the performance accuracy of actuators and cylinders and improve operational efficiencies.

The environment in which the embedded sensor must survive can be problematic.

The hydraulic fluid is under high pressures and temperatures and the actuators and cylinders are typically located in environments where heavy shock or vibration are present.

The HSTA and HSTAR series of LVDT (linear variable differential transformer) based linear position sensors are said to offer both the environmental resistance and short stroke sensor body length ideal to perform in cylinder applications where sensor length and survival in harsh environments are critical.

While linear position sensors were once considered too long for hydraulic applications, the development of new winding techniques, such as computerised layer winding and improved microprocessing, has reduced the length of the linear position sensor compared with its measurable stroke length.

For short stroke actuators and cylinders (less than 6in), Macro Sensors’ linear position sensors can be much shorter than a magnetostrictive sensor.

Hermetically sealed, these 3/4in (19mm) diameter, AC-operated linear position sensors can survive and thrive in temperatures of 200C and withstand high shocks and vibration.

Coil windings are sealed against hostile environments to IEC standard IP68.

The sensors are offered with either an axial (HSTA) or radial (HSTAR) connector, and units can have a through-bore for the fluid to pass or can seal the fluid in the RAM.

The radial connector makes the installed length of the HSTAR LVDTs at least 2in shorter than comparable units with an axially mounted connector for easier installation in tight spaces.

Accessible from both ends, the linear position sensors can be easily cleaned of grit, dirt, dust or other contaminants for greater reliability and longer life.

Available in ranges of +/-0.050in (+/-1.25 mm) to +/-10.0in (+/-250 mm), the HSTA and HSTAR series sensors feature the high resolution, repeatability, and low hysteresis associated with LVDT technology, as well as the high sensitivity consistent with good linearity.

The maximum linearity error for any of these sensors is +/-0.25 per cent of full range output using a statistically best-fit straight line derived by the least squares method.

Macro Sensors offers custom designs for higher temperatures and pressure resistance, smaller diameters and connector options.

HSTA and HSTAR series LVDTs operate properly with any conventional differential input LVDT signal conditioner.

Ranges of 1.00in or higher will also work with ratiometric LVDT signal conditioning.

Macro Sensors offers a full line of LVDT signal conditioners that will deliver optimum performance from any HSTA and HSTAR Series linear position sensor.

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