The Pixsys ATR121 is a compact 1/32 DIN (77 × 35 mm) panel-mount PID controller offering universal analogue input capability for single-loop temperature and process control. Its 3-digit red LED display provides clear process value readout at a glance, while the front-panel keys enable quick commissioning — including PID autotuning, setpoint adjustment, and Min/Max/Zero calibration — without a PC or programming tool.

What input types does the ATR121 support?

The universal input accepts thermocouples (J, K, R, S), RTDs (Pt100, Pt500, Pt1000, Ni100), thermistors (PTC 1000 Ω, NTC 10 kΩ), linear current (0–20 mA, 4–20 mA), linear voltage (0–10 V DC), and potentiometer inputs up to 150 kΩ. This flexibility means a single ATR121 model can replace multiple dedicated controllers across different machines and processes, simplifying spare parts inventory.

What control modes and output configurations are available?

The ATR121 supports ON/OFF control with adjustable hysteresis, full PID (P, PI, PD, PID), heating/cooling PID with dual output, and time-proportional logic for motorized valve positioning. The standard output configuration provides a SPDT relay (OUT1, 8 A @ 250 V AC) for the primary control action, a SPST-NO relay (OUT2, 5 A) for alarm or secondary output, and an SSR drive output (OUT3, 8 V DC / 20 mA) for solid-state relay interfacing in high-speed switching applications. The ATR121-ADT variant adds RS-485 Modbus RTU for integration with PLC and SCADA systems.

How is the ATR121 installed and what environmental ratings apply?

The controller fits a 70.5 × 28.5 mm panel cutout with a depth of 53 mm, secured by the supplied mounting bracket. The front panel is rated IP54 (IP65 with optional gasket), while the housing carries IP30 and terminals IP20. Operating range is 0°C to 40°C with 35% to 95% RH non-condensing humidity. Power options include the ATR121-B (230 V AC isolated), ATR121-AD (12–24 V AC / 12–35 V DC non-isolated), and ATR121-ADT (12–24 V AC/DC with RS-485 Modbus). All variants carry CE, cRUus, and UL Recognized approvals.