The IR33 series from Tempatron is a compact universal PID temperature controller designed as a direct replacement for the earlier IR32 series. Available with 1, 2, or 4 outputs in relay or SSR drive configurations, it handles dual independent control loops with auto-tuning PID and accepts a broad range of sensor inputs — from simple NTC/PTC thermistors and PT100/1000 RTDs to Type J/K thermocouples and 0–10V or 4–20 mA process signals.

What distinguishes the IR33 from its predecessor?

The IR33 adds a real-time clock for managing working cycles and logging alarm events, an infrared receiver for an optional remote control, and a programmable digital input for set-point switching or alarm functions. Accuracy is ±0.5% of scale range across all input types. The front panel is rated IP65, with overall dimensions of 76.2 × 34.2 mm fitting a 71 × 29 mm panel cut-out — mechanically interchangeable with the IR32 for retrofit installations. Power consumption is 3 VA maximum.

How does the RS-485 option extend the IR33's capabilities?

With the optional RS-485 serial interface, multiple IR33 controllers can be networked for centralized monitoring, remote set-point adjustment, and data logging from a supervisory system. Combined with the program key port — supporting battery-powered or mains-powered copy keys — this allows parameter sets to be cloned across multiple controllers on a production line or uploaded from a PC for batch configuration, reducing commissioning time in multi-zone thermal control applications.