Inductive linear sensors for high pressure, subsea cylinders position feedback

Alliance Sensors Group introduced the SS-7 series LVIT (Linear Variable Inductive Transducer) designed for subsea environments and the demands of oil and gas exploration. Ruggedness, easy installation and the ability simply set the end points in the field lowers the cost of ownership is dramatically reduced without sacrificing accuracy specifications. The SS-7 is designed to be embedded into a hydraulic cylinder and utilizes the gun-drilled piston rod as a target, sensing it’s position with-out the need for a magnet. The SS-7 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-Series-inductive-linear-Position-Sensor Features include:

Uses piston rod as target
316 Stainless Steel 25mm diameter housing
Measurement ranges from 1 to 24 in. (25 to 600 mm)
Operates to 5,200 psi or 12,000 ft (3,000 m) depth
Contactless; no wear-out
DC voltage or current analog output
SenSet Field Adjustable Scaling

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 SS-7 series, and its sister products ME-7, MR-7, and MHP-7, can withstand intense shock and vibration, and 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.

Alliance Sensors Group
www.alliancesensors.com