Category Archives: LVDT

New AC-Powered Long Stroke LVDT

The new Series LLS60X from Stellar Technology is a high performance long stroke LVDT displacement transducer with a spring return armature. The armature is restrained and guided by an ultra-low friction bearing assembly and the internal spring automatically positions the armature to its full extension. This design is used where it is not possible to connect the transducer armature to the moving part being measured.

The compact size of the LLS60X series makes it ideal for limited-space applications requiring a stroke range from ±0.5” to ±3.0”. These displacement transducers are ruggedly constructed of stainless steel and able to withstand harsh environments where high ambient temperature or vibration is present. LLS60X displacement transducers can be specified with either ±0.5% or ±0.25% linearity. Each unit is shipped with traceable calibration certificates.

New High Accuracy Gauging LVDT

The Model LPS60X AC/AC LVDTis designed for precision displacement and position measurement for quality assurance applications in industrial environments. These high accuracy displacement sensors are constructed of stainless steel and utilize a ball probe to smoothly interface with the target. The spring guided armature is supported with precision linear ball bearings to ensure excellent repeatability, high life cycle, and stable overall performance.

The compact LPS60X LVDT’s Series measures displacement from ±0.02 inches to ±0.2 inches, with 0.25% linearity, and infinite resolution. Operating temperature is from -40° to 212°F. The unit features a 6’ integral Polyurethane insulated cable which is resistant to oils and chemicals. All Series LPS60X displacement transducers are shipped with traceable calibration certificates.  Mounting brackets, alternative electrical connectors and a variety of probe tips are optionally available.

Precision Short Stroke LVDT

Stellar Technology offers the Series LSU61X short stroke precision LVDT, ideally suited for applications where dynamic measurement is needed but space is limited. This DC/DC displacement sensor operates from unregulated power supplies of +24 Vdc to +40 Vdc or dual ±12 Vdc to ±20 Vdc. Model LSU61X utilizes an internal amplifier to generate a ±5 Vdc output signal and the internal electronics include a filter circuit. The armature covers a stroke from ±0.10 to ±0.40 inches and is loose-fit (unguided) in the bore of the LVDT. Precise alignment along the bore produces a frictionless movement and long sensor life.

±0.5% linearity is standard. Linearities of ±0.25% or ±0.1% are available as options. Both the body and probe are constructed from stainless steel. These units are shipped with traceable calibration certificates.

New Subsea LVDT Series is Submersible to 7,500 ft.

The Series LWU is a family of submersible LVDT displacement transducers available in either DC or AC versions. These units are specifically designed for use in sea water and other submersible environments, including many corrosive liquids. The LWU Series features unguided armatures with stroke lengths from 0.5” to 4” and linearity of +/- 1%. Operating temperature is from -40 to 140 deg.F.

The LWU60X is an AC/AC unit with v/v output. The LWU61X and LWU65X are DC/DC units with outputs of +/-5 Vdc or 0-10 Vdc and 4-20mA, respectively. The LWU units are made of 316 stainless steel, and are fully welded. The heavy duty construction makes these units able to endure the most rigorous applications including 10 years submersion in seawater at a depth of 7500 ft. (2300 m). The free unguided armature design allows non-magnetic fluids to enter the transducer body without affecting the operation of the transducer. In addition, this thru-hole design helps overcome the problems associated with marine growth.

Submersible Long Stroke AC-AC LVDTs

Stellar Technology offers submersible long stroke LVDTs with the LYU60X and the LYS60X.  These AC/AC displacement transducers are designed specifically for applications in which the sensor is submerged in fresh water or most other noncorrosive liquids and gases for prolonged periods. These displacement transducers are ruggedly constructed of all stainless steel and are able to withstand harsh underwater environments as found in mining, upstream oilfield, geophysical, and industrial processes.

Model LYU60X features an unguided armature with a stroke range from ±0.5” to ±8”; while the LYS60X has an internal spring return and a ±0.5” to ±3” stroke range. Both units deliver ±0.5% linearity and are built to withstand pressures from 145 psi to 3000 psi. Linearities of ±0.1 and ±0.25% are available options on many units.

The LYS60X and LYU60X require separate signal conditioning, and provide optimum performance when powered with between 0.5V and 7V and from 2KHz to 10KHz, sinusoidal. All units are shipped with traceable calibration certificates.