Alliance Sensors Group's LA-27-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-27-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-27-A LVDT becomes an ideal solution for heavy duty industrial applications requiring position sensing. For operating an LA-27-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 M8 x 1.25 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 |
Series | Range inches | Termination | Material |
LA-27-A- | XX- | XX- | X- |
| 03 - 3” | 00- 1 m cable | A- Aluminum |
| 06 - 6” | 05- 6-pin minifast connector | S- Stainless Steel |
| 09 - 9” |
| |
| 12 - 12” |
| |
| 15 - 15” |
| |
| 16 - 16" |
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LA-27-A-XX Configurations | ||||||
| -03 | -06 | -09 | -12 | -15 | -16 |
Dim ‘L’ | 8.12”L | 11.87”L | 14.87”L | 18.87”L | 22.87”L | 22.87”L |
If you are looking for CAD drawings of our LA-27-A sensor, simply call us at 856-727-0250 or use the online contact us form by clicking here.
What Makes AC-LVDT Technology Essential for Precision Measurement
The LA-27 Series represents a breakthrough in linear position sensing technology, combining the proven reliability of AC-LVDT (Linear Variable Differential Transformer) principles with modern engineering requirements. For engineers and technicians working in harsh industrial environments, understanding these sensors' capabilities can mean the difference between system success and costly downtime.
Unlike potentiometric sensors that suffer from mechanical wear, AC-LVDT technology operates on electromagnetic induction principles. This contactless measurement approach eliminates friction between moving parts, resulting in virtually infinite resolution and exceptional repeatability over millions of operational cycles.
Key Performance Advantages in Real-World Applications
When selecting position sensors for critical applications, engineers consistently choose AC-LVDT technology for several compelling reasons. The LA-27 Series excels in environments where traditional sensors fail, including high-vibration machinery, extreme temperature conditions in industrial settings.
The sensor's robust construction withstands shock loads up to 1000g and continuous vibration without signal degradation. This durability translates directly to reduced maintenance costs and improved system uptime. Manufacturing facilities report sensor lifespans exceeding 25 years in continuous operation, even in challenging conditions like steel mills and chemical processing plants.
Temperature Stability and Environmental Protection
Operating reliably from -65°F to +400°F, the LA-27 Series operates across extreme temperature swings. The sealed housing achieves IP68 protection, preventing moisture, dust, and chemical intrusion. This environmental resilience makes these sensors ideal for outdoor installations, washdown areas, and heavy duty industrial applications.
Selection Guidelines for Optimal Performance
Choosing the correct LA-27 model requires careful consideration of stroke length, mounting configuration, and environmental factors. Available stroke ranges from 0.5 inches to 24 inches cover most industrial applications, from precision valve positioning to large hydraulic cylinder feedback.
Mounting versatility enhances installation efficiency. The series offers threaded body options, and rod-end bearings to accommodate various mechanical configurations. This flexibility reduces engineering time and simplifies retrofit installations in existing equipment.
Common Industrial Applications and Success Stories
Manufacturing engineers regularly specify LA-27 sensors for critical process control applications. In plastic injection molding, these sensors monitor mold positioning with micron-level accuracy, ensuring consistent part quality. Power generation facilities rely on them for turbine valve control, where failure could result in catastrophic equipment damage.
The aerospace industry values the LA-27's reliability for monitoring and testing applications. These demanding applications require absolute measurement certainty, which AC-LVDT technology consistently delivers.
Troubleshooting and Maintenance Best Practices
While LA-27 sensors require minimal maintenance, understanding proper installation and troubleshooting procedures ensures optimal performance. Proper cable shielding prevents electromagnetic interference, while correct mechanical alignment maximizes measurement linearity.
Calibration verification, though rarely needed, confirms continued accuracy. The contactless design means recalibration intervals can extend to years rather than months, reducing operational disruptions.
The LA-27 Series AC-LVDT linear position sensor represents mature, proven technology engineered for demanding industrial applications. Its combination of accuracy, durability, and environmental resistance makes it the preferred choice for engineers who cannot compromise on measurement reliability. Whether monitoring critical process variables or ensuring safety system integrity, these sensors deliver consistent performance that justifies their specification in high-stakes applications.
Download AC-LVDT Position Sensor LA-27-A Datasheet
