Which type of flowmeter has only one simple moving part and tends to require little maintenance?

The type of flowmeter that has only one simple moving part and tends to require little maintenance is the spring probe flowmeter. This design typically involves a spring that allows for a very straightforward mechanism to measure flow. Since it contains a singular moving part, the likelihood of mechanical failure is reduced compared to more complex designs with multiple components. Additionally, this simplicity often translates to lower maintenance requirements, making it an attractive option for various applications.

The other types of flowmeters mentioned may involve more intricate designs or several moving parts, potentially leading to higher maintenance needs. For instance, paddlewheel flowmeters utilize a rotating wheel that can wear out or become clogged, while bypass flowmeters often have multiple channels and components that require periodic checks. Front mount flowmeters may also have more complex mechanisms involved that can necessitate more frequent maintenance. Ultimately, the spring probe's design prioritizes reliability and ease of upkeep, making it ideal for situations where minimal maintenance is desired.