A device that converts a 4-20 mA signal into a pneumatic signal is known as a:

A device that converts a 4-20 mA signal into a pneumatic signal is known as an I/P transducer, which stands for Current to Pressure transducer. This type of transducer is specifically designed to take the electrical current signal, which is often used in process control systems to represent measurement data, and translate it into a pneumatic output, typically used to control pneumatic actuators or other devices that operate on air pressure.

The reason this conversion is essential is that many automation systems utilize electrical signals for data transmission, but the actual control mechanisms in some processes rely on pneumatics. The 4-20 mA standard signal is widely used because it allows for reliable data transmission over distances and can provide information on sensor health, as the current will drop below 4 mA if there is a problem.

In contrast, devices such as pneumatic actuators are used to convert pneumatic signals into mechanical movement, and while signal converters can encompass a broad range of conversions between different signals, they are not specifically designed for the 4-20 mA to pneumatic context. Control relays are electrical devices that open and close contacts to control equipment, without performing the same direct conversion of signals as an I/P transducer does. Thus, the I