LVIT Sensors for Subsea Environments


The SS-7 series LVIT (Linear Variable Inductive Transducer) is designed for subsea environments and the demands of Oil and Gas Exploration. Ruggedness, ease of installation, and the ability simply set the end points in the field while lowering the cost of ownership. The SS-7 is designed to be embedded into a hydraulic cylinder and utilizes the gun-drilled piston rod as a target, sensing its position without the need for a magnet. The series can be submerged to a depth of 12,000 ft. or installed in a PBOF (pressure balanced oil filled) chamber to provide position feedback on Blow Out preventers, ROVs and relief valves.


SS-7 sensors use a simple coil design rather than “time-of-flight” technology or resistive film. They are based on contactless LVIT inductive sensing technology that employs a solid probe construction style which requires only a simple conductive tubular target or a small diameter gun drilled hole in the cylinder rod for operation rather than needing a permanent magnet ring or some other type of special target.


The series can withstand intense shock and vibration, as well as operating temperatures up to 105°C with the extended range option. The 1-in. (25.4 mm) diameter sensor head is compact making efficient use of space, mounting with a common male o-ring SAE-8 port threads, and has an excellent stroke-to-length ratio. 


The SS-7 and all ASG LVITs are offered with ASG's proprietary SenSet calibration feature permits the user to match the analog output of the sensor to the motion of the actuator or cylinder on a stand-alone basis rather than the user having to scale the sensor's basic output in an associated control system.



  • Uses Piston Rod as target
  • 316 Stainless Steel 25 mm diameter housing
  • Measurement ranges from 1 to 24 in. (25 to 600 mm)
  • Operates to 5200 psi or 12,000 ft. (3000 m) depth
  • Contactless; no wear-out
  • DC voltage or current analog output
  • SenSet Field Adjustable Scaling
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