The Autonics TC4S-24R is a compact DIN rail style temperature controller in a 48 by 48 mm footprint designed for easy panel installation. It features a clear 4-digit 7-segment LED display and offers flexible control methods including ON/OFF, P, PI, PD, and PID to suit a wide range of process needs. The unit accepts thermocouples K (CA), J (IC), and L (IC) as well as RTDs Pt100Ω and Cu50Ω, with a sampling cycle of 100 ms for responsive monitoring. Output options include a relay capable of 250 VAC and up to 3 A, or an SSR drive at 12 VDC with modes for ON/OFF, phase, and cycle, and there are optional Alarm 1 and Alarm 2 outputs for additional monitoring. The power supply supports 100–240 VAC at 50/60 Hz, allowing use across different regions. Tuning parameters consist of a proportional band from 0.1 to 999.9, integral and derivative times from 0 to 9999 seconds, and a control period ranging from 0.5 to 120.0 seconds, with a manual reset adjustable from 0.0 to 100.0%. The device is designed for ambient temperatures of -10 to 50°C (storage: -20 to 60°C) and ambient humidity of 35 to 85% RH (storage the same). Insulation is double insulation or reinforced insulation, with marked dielectric strength between the measuring input and power sections at AC power 2 kV and AC/DC power 1 kV for safe and reliable operation in industrial environments.