When selecting a Linear Variable Differential Transformer (LVDT) for your application, one important consideration is whether to use a hermetically sealed or non-hermetically sealed model. The difference comes down to how the sensor is built—and how well it stands up to environmental challenges.
Hermetically Sealed LVDTs (Welded Body)
These LVDTs are built with stainless steel housings that are welded at the seams to form a completely airtight seal. This design prevents moisture, dust, or chemicals from entering the sensor.
Advantages:
- Superior environmental protection: Ideal for applications where high humidity, pressure, dust, or fluids are present.
- Built to last: Extended lifespan in harsh industrial or outdoor settings.
Typical Applications:
- Aerospace and aviation
- Subsea or underwater systems
- Power generation (nuclear, hydro)
- Chemical processing environments
Considerations:
- Higher upfront cost to purchase
- Preferred for mission-critical or long-term deployments
Non-Hermetically Sealed LVDTs
These sensors are typically sealed with O-rings, gaskets, or epoxy, but they’re not fully airtight. They work well in clean, dry, and controlled environments.
Advantages:
- Cost-effective: Simpler construction means lower cost
- Reliable for general use in standard industrial or lab settings
Typical Applications:
- Laboratory equipment
- Medical devices
- Factory automation in clean areas
Limitations:
- Reduced resistance to contaminants, moisture, and chemicals
- May have a shorter lifespan in harsh or fluctuating environments
Key Takeaway:
- Choose a hermetically sealed LVDT for tough environments where moisture, pressure, or chemicals are a concern.
- Go with a non-hermetically sealed LVDT for budget-friendly performance in clean, low-risk settings.
Need help selecting the right LVDT for your environment? Contact us today—our engineers are ready to help you find the best fit for your application.