Proper installation of an LVDT sensor is essential for achieving accurate measurements, repeatability, and long service life. Below are the key best practices to follow:
1. Use Mounting Blocks for Secure and Accurate Installation
Precision-machined mounting blocks ensure stable, consistent positioning of the LVDT body. They help maintain axial alignment between the sensor and core, minimizing mechanical stress and alignment errors.
- Always use split-collar style mounting blocks. These provide even clamping force around the sensor body.
- Do not use set screws that press directly against the side of the LVDT housing—this can damage the sensor by deforming the housing and can lead to degraded performance.
- Mounting blocks should be matched to the LVDT’s body diameter and mounting features—either factory-supplied or custom-fabricated.
Acceptable Mounting Block Materials:
- Aluminum – Lightweight, rigid, and non-ferromagnetic. A top choice for most applications.
- Brass – Dense, stable, and non-ferromagnetic
- 300 series stainless steel
- Plastic composites (e.g., Delrin or Phenolic) – Suitable for applications where electrical isolation or corrosion resistance is required; ensure the material provides adequate mechanical strength and remains dimensionally stable at the operating temperature
2. Ensure Proper Axial Alignment
- The core must move linearly and concentrically within the sensor bore.
- Avoid Lateral or Side Loading on the Core. Misalignment can cause friction, binding, or inaccurate readings.
- Use linear bearings or external guidance systems if precise core motion cannot be guaranteed by the mechanical design.
- Consider guided-core or spring-loaded models if external alignment is not available.
3. Secure Cables and Use Proper Strain Relief
- Use strain relief at the cable entry to prevent stress or damage.
- Route cables away from high-voltage sources, motors, and EMI sources.
- Avoid sharp edges and moving parts that could abrade the cable jacket.
Summary: LVDT Mounting Best Practices
✔ Use split-collar, precision-machined mounting blocks made from non-ferromagnetic materials
✔ Avoid set screws pressing against the housing
✔ Maintain proper axial alignment with no side load
✔ Use proper strain relief and EMI-conscious cable routing
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