Thermal Flow Sensors

Method

Thermal flow sensors operate on a straightforward principle: when a fluid flows over a heated element, it cools the element down. The amount of heat loss is proportional to the flow rate. By either measuring the heat loss or the power needed to maintain a wire at a specific temperature, you can accurately gauge the flow rate.

These sensors are typically simple insertion devices that can be installed via a tapping point into your pipe or ductwork, making them quick and easy to install.

Advantages

• Cost-effective for straightforward applications
• No moving parts
• Simple and non-intrusive installation

Disadvantages

• Primarily suited for gas or air applications, though some switch models can be used with water and oils
• Less accurate than other sensor types
• Not ideal for applications with rapid temperature changes