AC-LVDT Position Sensor LA-25-A Series: Extreme Duty Industrial Environments

For Use In
Steam and Hydroelectric Power Plants
Industrial Fluid Power Equipment
Factory Automation Systems
LA-25-A Series
AC-LVDT Linear Position Sensor
Specifically Designed for Harsh Industrial Environments

Alliance Sensors Group's LA-25-A series LVDT linear position sensors are designed to handle extreme industrial environments. This robust linear sensor has a thick wall aluminum housing (also available in stainless steel), a core enclosed inside of the core extension rod assembly that cannot break loose, while offering a sturdy male thread for easy mechanical connection, and a pair of double contact shaft seals to keep fluids and solid contaminants out of its bore. The sensor’s electrical termination includes the choice of an axial connector or a cord grip with a cable.

An LA-25-A LVDT is ideal for roller gap positioning, head box feedback, process valve displacement, and actuator position feedback with the durability to withstand the harsh environments found in steam and hydro power plants; paper, steel, and aluminum mills; and industrial automation and fluid power systems. It can operate in such hostile factory environments as lubricant mist, cutting oil spray, and airborne grit or dust, and it survives typical industrial steam cleaning and wash downs.

Mated with ASG’s SC-200 industrial LVDT DIN-rail-mountable signal conditioner, the LA-25-A LVDT becomes an ideal solution for heavy duty industrial applications requiring position sensing. For operating an LA-25-A as a steam valve position sensor in a power plant, ASG’s model S2A signal conditioner, which is designed specifically for that application, is recommended.

For more information, see the technical datasheet below.

  • - Stock Ranges: 3, 6, 9, 12, 15, or 16 Inches (75 mm to 400 mm) Full Scale
  • - Works in 3-Wire, 4-Wire, 5-Wire, 6-Wire, and Ratiometric (A-B/A+B) Systems
  • - Core Totally Enclosed in 3/8 Inch (9.5 mm) Diameter Core Extension Rod
  • - Two Double Contact Shaft Seals Keep Out Contaminants
  • - 5/16-24 or M8x1.25 Male Threaded Shaft End
  • - Continuous Operation to 250 °F (120 °C)
  • - Environmentally Sealed to IEC IP-68
Available FS Ranges: 0 to 3, 6, 9, 12, 15, or 16 inches (0 to 75, 150, 225, 300, 375, or 400 mm)
Excitation Frequency: 3 kHz nominal
Excitation Voltage: 3 V ACrms nominal
Full Scale Output: 0.83 ±10% V ACrms output (nom.) from differentially connected (S1-S2) secondaries (ref: 3 Vrms excitation); sum of secondaries output is constant over range for ratiometric (S1-S2)/(S1+S2) operation
Linearity Error: ≤±0.5% of FSO
Operating Temperature: -40 to 125 °C (-40 to 250 °F)
Temperature Coefficient: ≤±0.025% FSO/degree C
Humidity: 95% RH non-condensing
Shock: 1000 g, 11 msec.
Vibration: 5-20 Hz, 0.5 inch p-p; 20-2000 Hz, 4.2 g p-p
Ordering Info Table


Range inches






03 - 3”

00- cord grip with 1 m cable


06 - 6”

03- cord grip with 3 m cable


09 - 9”

06- 6-pin Turck minifast connector


12 - 12”



15 - 15”



16 - 16"



Configuration Table

LA-25-A-XX Configurations









Dim ‘L’








If you are looking for CAD drawings of our LA-25-A sensor, simply call us at 856-727-0250 or use the online contact us form by clicking here. 


Product Diagram

Product Video

Stocking Distrubutors