SSI-Series LVDT Position Sensor

---

Key features

• Long term reliability (20+ years)
• Inconel construction standard
• High pressure applications (to 5,000 psi)
• 4-20mA two-wire, loop-powered I/O
• Non-linearity of ±0.10% of FRO or better
• Welded connector also available

---

About the SSI Series Submersible LVDT position transmitters

Due to their extraordinary repeatability despite variations in pressure and temperature, the SS 937 Series submersible LVDTs are ideal for incorporation into a wide variety of subsea measurement systems. These rugged, .94 inch [nom.] (24 mm) diameter sensors are available in standard ranges of 2.00 inches (50 mm), 3.00 inches (75 mm) or 4.00 inches (100 mm), although other ranges are available at special request.

To withstand deep-sea environments with external pressures to 5000 psi, SS Series LVDTs are constructed of Inconel. Inconel enhances the already high-reliability of the LVDT assembly, ensuring that it can meet service life requirements of at least 20 years, even if the device is fully exposed to seawater.

SS Series LVDTs also resolve the problem of getting a signal back to the surface, even at great water depths. To minimize the number of pressure sealed I/O connections and to minimize noise over long transmission lines, a 4-20 mA two-wire, loop-powered I/O is utilized. Offsets can be easily made in the data acquisition system on the
platform above. Electrical termination is through a high pressure axial or radial Seacon-Brantner subsea connector.

Some typical applications include monitoring structural movement for long-term FEA (Finite Element Analysis) of pipelines, derricks, moorings and other critical high stress members on offshore oil platforms. SS Series LVDTs are designed for use in either pressurebalanced, oil-filled containers or directly in seawater.

Key features SSI-Series

• High pressure Seacon-Brantner subsea connector standard
• Available in either inline axial or radial connector configurations

Applications for SSI-Series

• Off-shore drilling platforms
• Pipeline monitoring
• Choke valves
• ROV and exploration
• Mooring cables
• Extensometers