Barber-Colman MAQ304011 Temperature Controller

The Barber-Colman MAQ3-04011 100-3-00 Temperature Controller (MAQ304011, 100300) is a legacy Barber-Colman MAQ-series digital temperature controller designed for industrial process temperature regulation. As part of the MAQ family, it supports multiple input types and configurable outputs typical of Barber-Colman controllers of this era, enabling use with thermocouples, RTDs, mA signals, and DC inputs. The unit offers a range of outputs including relay, 4-20 mA, isolated DC, logic, and Limitrol options, making it adaptable to different control architectures and safety requirements. Refurbished availability is shown in active listings for MAQ3-04011 100-3-00, confirming continued use in legacy installations and spare-parts sourcing. MAQ304011 and related part numbers (100-3-00 and 100300) correspond to the same controller model, ensuring compatibility with legacy Barber-Colman equipment that requires MAQ3-04011.