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 |
Series | Range inches | Termination |
LA-25-A- | XX- | XX- |
| 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" |
|
LA-25-A-XX Configurations | ||||||
LA-25-A-XX | -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-25-A sensor, simply call us at 856-727-0250 or use the online contact us form by clicking here.
Why Extreme Environment Position Sensing Demands Specialized Solutions
When standard position sensors fail in punishing industrial conditions, the LA-25 Series AC-LVDT delivers uncompromising performance. Designed specifically for extreme duty applications, these sensors withstand environmental challenges that destroy conventional measurement devices. From offshore oil platforms to steel foundries, the LA-25 Series provides reliable position feedback where others simply cannot survive.
The fundamental difference lies in purpose-built construction. While typical sensors compromise durability for cost savings, the LA-25 prioritizes survival in hostile environments. This design philosophy results in sensors that operate continuously in conditions featuring high operating temperatures, chemicals, vibration, and pressure.
Critical Design Features for Harsh Environment Survival
Understanding what makes the LA-25 Series exceptional requires examining its construction details. The sensor housing utilizes heavy-wall stainless steel, providing superior resistance to chemical attack and mechanical damage. This robust housing protects sensitive internal components while maintaining dimensional stability across temperature extremes.
Advanced Coil Protection and Signal Integrity
Internal coil assemblies receive special encapsulation treatments that prevent moisture absorption and thermal degradation. High-temperature potting compounds maintain electrical isolation even when exposed to temperature cycling from -65°F to +400°F. This thermal resilience proves essential in applications like engine testing and furnace positioning systems.
Vibration and Shock Resistance Engineering
Extreme duty environments subject sensors to punishing mechanical forces. The LA-25 Series withstands continuous vibration to 20g and shock loads exceeding 1000g without performance degradation. Reinforced core assemblies prevent mechanical failure modes common in standard sensors.
Application-Specific Benefits in Demanding Industries
Different industries present unique challenges requiring tailored solutions. The LA-25 Series addresses these sector-specific requirements through customizable configurations and proven performance in real-world applications.
The LA-25's corrosion-resistant materials and sealed construction provide decades of maintenance-free operation in these challenging conditions. Operators report zero failures even after 20 years of continuous service.
Mining applications subject sensors to abrasive dust, and extreme mechanical abuse. The LA-25's ruggedized construction ensure reliable position feedback for conveyor systems, hydraulic shovels, and processing equipment.
Installation Considerations for Maximum Reliability
Proper installation techniques maximize sensor longevity in extreme environments. Mechanical alignment proves critical – misalignment accelerates wear and degrades measurement accuracy. Using appropriate mounting hardware rated for environmental conditions prevents premature failure of support structures.
Cable management deserves special attention in harsh environments. Armored cables resist mechanical damage while sealed connectors prevent moisture intrusion at termination points. Proper strain relief prevents cable fatigue from vibration-induced movement.
Preventive Maintenance Strategies
Although LA-25 sensors require minimal maintenance, implementing preventive measures extends operational life. Regular inspection of mounting hardware identifies loosening from vibration before sensor damage occurs. Checking cable integrity prevents signal degradation from insulation breakdown.
Calibration verification intervals depend on application criticality rather than sensor drift. The inherent stability of AC-LVDT technology means calibration rarely changes, but periodic checks confirm continued accuracy in safety-critical applications.
Real-World Performance Validation
Field data demonstrates the LA-25 Series' exceptional reliability. Steel mills report continuous operation in 300°F ambient temperatures with direct exposure to molten metal splatter. Chemical plants document years of service in atmospheres that dissolve standard sensors within months.
Power generation facilities specify LA-25 sensors for turbine valve control and generator alignment monitoring. These applications cannot tolerate position measurement uncertainty, making sensor reliability paramount for operational safety.
The LA-25 Series represents the pinnacle of extreme duty position sensing technology. Its combination of robust construction, environmental resistance, and measurement precision makes it the only viable choice for applications where failure isn't acceptable. Engineers specifying position sensors for the world's harshest environments consistently choose the LA-25 Series, knowing it will perform when conditions exceed the limits of conventional sensors.
Download AC-LVDT Position Sensor LA-25-A Datasheet
