What system uses a sensing device to adjust pressure within the control line?

A pneumatic control system operates by using compressed air to transmit and control signals, making it highly effective for adjusting pressure within a control line. In this system, sensing devices such as pressure sensors detect the current pressure levels and relay that information to a control mechanism. If the pressure deviates from the desired set point, the system adjusts it accordingly by modulating the flow of compressed air. This automatic adjustment helps maintain stability and accuracy in processes where pressure is critical.

For instance, in industrial applications, pneumatic control systems can ensure that pressure remains within specified limits, which is essential for safety and efficiency in operations. The responsiveness of pneumatic systems to changes in pressure allows for precise control over processes such as material handling, system automation, and various manufacturing activities.

While mechanical, hydraulic, and electronic control systems have their own unique methods and applications, they do not typically rely on air pressure as their primary control means, which distinguishes pneumatic systems in this context.