HMI (Human-Machine Interface) panels come in various sizes, depending on the specific requirements of the industrial application and the manufacturer's product offerings. HMI panels are available in a range of sizes to accommodate different needs, from compact displays for localized control to larger screens for overseeing complex processes. Here are some common sizes for HMI panels:

1. Small Panels: Small HMI panels typically have screen sizes ranging from 3 inches to 7 inches diagonally. These compact panels are often used for localized control and monitoring of individual machines or equipment, such as on a control panel or operator station.

2. Medium Panels: Medium-sized HMI panels typically have screen sizes ranging from 7 inches to 15 inches diagonally. These panels are suitable for monitoring small to medium-sized processes or systems, such as production lines or standalone machines.

3. Large Panels: Large HMI panels typically have screen sizes ranging from 15 inches to 24 inches or larger diagonally. These panels are commonly used for overseeing complex industrial processes or systems that require detailed visualization and control, such as in manufacturing plants, utilities, or infrastructure facilities.

4. Custom Panels: In some cases, custom-sized HMI panels may be used to meet specific requirements or fit unique mounting configurations. Custom panels can vary in size depending on the needs of the application and the capabilities of the manufacturer.

The size of the HMI panel chosen for a particular application depends on factors such as the amount of information to be displayed, the viewing distance, the available space for installation, and the user interface requirements. Larger panels may offer more screen real estate for displaying detailed graphics and data, while smaller panels may be more compact and suitable for constrained spaces. Ultimately, the size of the HMI panel should be selected to optimize usability, visibility, and functionality for the intended application.