A system was designed and installed on the Tokamak Fusion Test Reactor (TFTR) to monitor temperatures and to control electrical heaters for 150 °C bakeout. This system, an adjunct to the hot air vacuum vessel heating system, is used for heating vacuum vessel port covers, neutral beam ducts, and diagnostic vacuum enclosures contiguous with the main vacuum vessel. The control scheme is based on an Allen-Bradley 2–30 Programmable Controller (PC) which acquires thermocouple data, calculates temperature differentials and provides proportional control of the heater power supplies. Temperature differentials between the vessel walls heated by hot air and the electrically heated portions are limited by the system to avoid excessive thermal stress as the machine temperature is raised expeditiously to bakeout level. The system prints out operating parameters and operates independent of the main TFTR control computer which is interconnected only for data display and archiving.