The Omron EJ1N-TC4B-QQ is a modular temperature controller designed for precise temperature regulation in industrial applications. This device features four control loops, allowing for simultaneous management of multiple temperature points. It supports various input types, including thermocouples (K, J, T, E, L, U, N, R, S, B, C/W, PLII), platinum resistance thermometers (Pt100, JPt100), and infrared thermosensors, accommodating a wide range of temperature sensing needs. The controller offers linear analog input options such as 0 to 10 V, 0 to 20 mA, 0 to 5 V, 1 to 5 V, and 4 to 20 mA, providing flexibility in integration with different systems. Control outputs are provided through four voltage pulse outputs, suitable for driving external solid-state relays (SSRs), ensuring efficient control of heating or cooling elements. The device operates within a temperature range of -200°C to 2300°C, catering to both low and high-temperature processes. It is powered by a 24 VDC supply, with an allowable voltage fluctuation range of 85% to 110% of the rated voltage, and has a maximum power consumption of 3 W under maximum load conditions. The controller is housed in a compact module measuring 31 x 90 x 105 mm, facilitating easy integration into existing systems. It utilizes screwless clamp terminals for secure and straightforward wiring, enhancing installation efficiency. Designed for durability, the EJ1N-TC4B-QQ can withstand operating temperatures from -10°C to 55°C and storage temperatures from -25°C to 65°C, provided there is no icing or condensation. This robustness makes it suitable for various industrial environments. For detailed specifications and additional information, refer to the official Omron product page.