Pneumatic signals operate between which of the following pressure ranges?

Pneumatic signals typically operate within a pressure range that allows for reliable transmission of control signals while maintaining the integrity of the system. The correct choice indicates that pneumatic signals generally function effectively between 20 and 100 kPa, which is the standard range used in many industrial applications. This range is sufficient to create a noticeable difference in pressure for signal transmission while preventing excessive pressure that could damage system components or lead to inefficiencies.

Operating outside this range, particularly above 100 kPa, can increase the chances of potential leaks or failures in the transmission lines. Similarly, pressures lower than 20 kPa may not generate a signal strong enough to be effectively transmitted or to be discernible, leading to potential inaccuracies in control systems.

Thus, the chosen range of 20 to 100 kPa is optimal for ensuring clear and effective communication in pneumatic systems, making it the appropriate answer.