Considering your situation, both the VEP-A00-1P and VLF-500-00 are excellent replacements for the Vesda VSP-501. It ultimately depends on your specific requirements and the compatibility with your existing setup. The VEP-A00-1P offers advanced features and precise detection capabilities, making it a great choice for sensitive environments. On the other hand, the VLF-500-00 provides reliable performance and ease of integration, suitable for various applications.
I recommend assessing your project needs, such as detection sensitivity, environmental conditions, and budget constraints. If you need further assistance in making a decision, feel free to provide more details about your setup, and I’d be happy to help you choose the most suitable replacement.