Why are sensors used instead of pressure plates to automatically flush toilets after use?

Question

Why are sensors used instead of pressure plates to automatically flush toilets after use?

In: 9

Answer 1

Pressure plates are a moving part. Moving parts and water are a recipe for scale buildup, sticking, and maintenance. If the moving mechanism can be sealed in a container and activated through an IR window, that’s likely cheaper from a maintenance point of view.

The cost of the valve is small, relative to the cost of a plumber to maintain it.