Macro Sensors custom designs LVDT position sensors
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Macro Sensors product story
Edited by the Engineeringtalk editorial team
Sep 9, 2008
Macro Sensors has announced that it custom designs high-pressure and seawater resistant LVDT position sensors for incorporation into sub-sea measurement systems.
The systems monitor structural movement for long-term Finite Element Analysis of offshore platforms, pipelines, derricks, moorings and other critical high-stress members on offshore oil platforms.
The high-pressure and seawater resistant LVDT position sensors can also be used to measure the position of the valves on sub-sea oil well control towers, located at the wellhead, as well as controlling or measuring position of robotic arms and actuators.
Macro Sensors LVDT position sensors are designed from 316SS and Inconel 625 for pressure and corrosion resistance.
The sensors also resolve the problem of getting a signal back to the surface for monitoring, recording and/or controlling some physical action taking place on the surface or sea water, even in great water depths.
To minimise the number of pressure-sealed connections and I/Os, a 4-20mA two-wire, loop-powered I/O can be utilised, which is then, converted to a RS485 signal for transmission to the surface.
Typically, a digital converter is contained in a high-pressure sealed bottle located nearby.
A 4-20mA I/O also minimises any noise over long transmission lines.
Offsets can be made in the data acquisition system on the platform above.
The LVDT design features zero-leakage pressure sealing, often verified by helium mass spectrometer leak testing.
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