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Position Sensors For Demanding Applications
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Date Added: 4th May 2012
Applied Measurement Ltd have developed a range of linear position sensors (also known as displacement transducers) to meet the need of accurate positioning of industrial, process, marine and mobile machinery. For demanding applications the AML/IE Industrial LVDT Displacement Transducer range can measure displacements in ranges from 0 to 0.5mm to 0 - 500mm about a central null point (i.e. a total range of 1 metre) with accuracy better than ±0.5% of stroke range.
These position sensors operate on the electromagnetic principle wherein two opposing electrical coils wound in series on a glass fibre hollow core. Between the two coils, there is a centrally wound coil on the glass fibre coil that is excited by a continuous AC voltage, 2 to 5Vrms @ 1 to 5kHz Within that core there is a guided steel shaft with a highly magnetically permeable central element.
When the stationary centre outer coil is energised, this induces a signal voltage in the two outer coils, the value of which depends where the central element is longitudinally located. When it is directly equidistant between the two outer coils, there is a null reading.
As the central element is moved, the balance changes and a signal voltage is induced that is proportional to the displacement one side or the other of the null point within the range physically set by the shaft guides.
There are 3 basic configuration options for these position sensors. First, there is the Standard option; plain core and extension with M6 threaded shaft end and Ø6mm fixed rod end bearing. This option is designed to follow the displacement of say machine tools in one axis or diameter from a central point, such as pick-and-place production line equipment and assembly line robots.
Second is the option S loaded shaft with plain ball end used typically for monitoring lateral displacements of moving belt guides, The third option is Option R that is similar to the Standard option but with threaded rod end on the shaft end as well.
All these position sensors are constructed in stainless steel with IP65 enclosure as standard and so they are basically weather-proof. Alternatively they can be supplied to IP68 for submersible applications and are proof tested to 100m depth. They can also be supplied for greater depth operations to special order thus making them eminently suitable for external control arms for submersible craft. These sensors are tough with a vibration resistance of 20g @ 20kHz and a shock resistance of 100g for 10 milliseconds.
Electrically, there are both AC and DC excited models and a range of industry-standard analogue outputs offered including 0-5Vdc, 0-10Vdc and ±2.5Vdc, as well as a 3-wire 4-20mA current output.
To obtain more information on the AML/IE LVDT Displacement transducer range and other position sensors for other laboratory, industrial or small scale applications, just click on a link from this page.
Find out about the Applied Measurements linear position sensor products on their website.
More from this supplier | More from this category: Sensors
More from this subcategory: Position Sensors