Macro Sensors LVDT enables Linear Position Sensing

  • November 19, 2012
  • Macro Sensors
  • Case Study
November 19, 2012 - A long stroke linear position sensor offering superior performance over magnetostrictive technology in harsh environment applications uses a Macro Sensors LVDT as its core sensing technology.   Providing reliable long stroke position measurement in heavy duty applications where rod-type sensors do not hold up, the SL Series Linear Position Sensors from Control Products Inc. are built for use in hydraulics, power plants, automation, oil and gas, deep sea applications, high-end mobile hydraulics such as mining and construction equipment as well as specialty large bore cylinders and accumulators.
Unlike the rod design of magnetostrictive sensors, the SL Series Sensor is enclosed in a pressure vessel with a cable that passes through a high-pressure conduit made from standard hydraulic hose. At the heart of the sensor is a Macro Sensors Series CD LVDT that is compact in size and resistant to harsh environments, making the long stroke position sensor more robust to shock, vibration and temperature extremes than probe-type sensors.  
To accommodate high pressure hydraulic environments, the case of the LVDT is vented to equalize pressure inside and outside the unit.  Since vent holes in the housing expose the coils inside, fluid must be electrically non-conductive and chemically benign such as hydraulic fluids.  High temperature ratings are achieved by using proprietary materials rated for these temperatures. 
A significant benefit to the SL Series Sensor is that it works for any stroke length over a 120” sensing range in virtually any accumulator or hydraulic cylinder with almost no modification to the design, most notably without core drilling of the rod.  This makes position sensing much more practical in long stroke applications, including telescoping cylinders where internal piston position sensing was not possible.  And, there is no lower limit to the cylinder bore size.  SL Series sensors can also be used to indicate the potential in hydraulic accumulators via piston position sensing – another first!
A patented self-locking cable connector of the SL Linear Position Sensors facilitates easy drop-in replacement of rod-type sensors.  Users only need to unscrew the magnetostrictive sensor and replace it with the SL Sensor into the existing sensor port without any equipment modifications. 
About CPI
Control Products Inc. provides creative control solutions to a diverse group of markets, where high reliability is needed in demanding applications. The company's success can be attributed to a mission "to be THE company that provides the highest level of service".  That mission is focused by an ISO9001/AS9000 quality system and supported by a conservative management philosophy which places a high value on all employees.  Providing creative, reliable control solutions, shipped on time, defect-free is the one sentence description of CPI's products and services. From application solution development to meeting demanding production schedules, the mission remains the same: "to be the company that provides the highest level of service". All of CPI's operations are under one roof in East Hanover, NJ and 99% of our purchased parts and materials are sourced domestically.
About Macro Sensors
Macro Sensors’ extensive line of linear and rotary sensors are used for position measurement and feedback in a variety of industrial applications including factory automation, motion control systems, metal fabricating, automotive assembly as well as power plants, gas/steam turbines.    Incorporated in 1994, the 
Company offers more than 200 years of cumulative design and manufacturing experience by its key staff in serving its OEM and end-user international customer base.   On June 1, 2005, Macro Sensors was acquired by AST, manufacturer of state-of-the-art (Micro Electro Mechanical Structures) MEMS-based pressure sensors, transducers, and transmitters.   Common applications of AST sensor products are in industrial OEM, hydraulic systems, fuel cells, medical gases, HVAC/R, refrigeration, oil & gas exploration/production, and off-road vehicles. 
Learn More

Did you enjoy this great article?

Check out our free e-newsletters to read more great articles..