Frequency-to-current converters are specialized industrial devices used to convert frequency signals into proportional current outputs, commonly employed in automation and process control systems. These devices are produced by various manufacturers worldwide, including notable companies like Siemens (Germany), ABB (Switzerland), and Emerson (USA). They serve industries such as manufacturing, energy, and HVAC, offering precise signal conversion for applications like motor control, instrumentation, and monitoring. Products often include isolated converters, DIN rail-mounted units, and programmable models, ensuring compatibility with diverse industrial environments.