Horizontal Smart Controller 904 with Modular Design, Fully Digital Circuit & Industrial-Grade High-Performance MCU18 types of RTDs, thermocouples, standard current and voltage are compatible for input. Input signals are selected by keys, and the measurement mode and range are automatically converted. 4 20mA, 0 10V, 0 5V analog transmission output. The transmission range can be set arbitrarily, and the upper and lower limit alarms can be set freely. Two channel relay control output, upper limit, lower limit, and interval alarms. Intelligent alarm algorithm