Macro Sensors introduces a line of submersible linear variable differential transformer (LVDT) position sensors for use as part of subsea measurement systems.
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The SSIR 937 Series Submersible LVDT. From Macro Sensors. |
Macro Sensors LVDTs are proven to offer reliable measurement and feedback for continuous monitoring. The SSIR 937 Series Submersible LVDT Position Sensoris now a standard design available from stock for fast turnaround.
Offering extraordinary repeatability in extreme pressure environments, the SSIR 937 Series Submersible LVDT Position Sensors can withstand deep sea environments with external pressures to 5000psi. Inconel construction enhances the already high reliability of the LVDT assembly, ensuring the submersible transmitters can meet life requirements of at least 20 years, even if the device is fully exposed to seawater at depths greater than 10,000ft.
As the search for oil and gas goes into deeper water, LVDT linear position such as Macro Sensors Submersible Series have become more dominantly used, replacing other technologies such as load cells in marine and offshore applications. Depending upon the temperature, salinity, oxygen levels and depths of the oil and gas fields, the LVDT, with its hermetic seal and non-contacting operation, is often the only technology that can deliver accurate and reliable performance in subsea conditioners.
Designed for use in either pressure-balanced, oil-filled containers or directly in seawater, these rugged, 0.94 in. diameter LVDT position sensors are available in standard ranges of 2 in. 3 in. or 4 in. Other ranges available upon special request.
SSIR 937 Series Submersible LVDT Position Sensors also resolve the problem of getting a signal back to the surface, even at great water depths. To minimize the number of pressure-sealed connections and I/Os, a 4-20mA two-wire, loop-powered I/O is utilized. A 4-20mA I/O also minimizes noise over long transmission lines. Offsets can be easily made in the data acquisition system on the platform above.
Some typical applications of Macro Sensors SSIR 937 Series Submersible LVDT Position Sensorsinclude monitoring structural movement for long-term FEA (finite element analysis) of pipelines, derricks, moorings, choke valves, extensometers and other critical high stress members on offshore oil platforms.
For example, Macro Sensors submersible LVDTs are used to measure the extension of the structural members of oil platforms to a fraction of a microstrain. To ensure oil platforms don’t shift, movement is measured to less than 2mm. Because required measurement must be obtained in seawater depths down to 7500ft., with external pressure of approximately 3800psi and where service life requirements are a minimum of 20 years, Macro Sensors submersible linear positions offer resistance to pressure and corrosion while offering the high-reliability and long-term operation required of this application, even when fully exposed to sea water.
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