The Series 4000 Temperature Control is a family of 1/4 DIN panel-mount temperature controllers, primarily manufactured by Athena, with related units branded by Sterlco and Sterling Inc. These controllers provide precision temperature regulation for industrial heating and cooling equipment, with many models covering ranges up to 1000°F.
The series spans a broad range of configurations to suit different process needs. Common variations include:
Alarm-equipped models for process monitoring and safety
PID control for tighter regulation, offered individually or combined with alarm functions
RTD input versions alongside standard thermocouple-based units
Limit control variants for over-temperature protection
Members of the family carry model numbers in the 4000 and 4200 ranges, with suffixes indicating specific input, output, and alarm options. A small number of units are also categorized as chiller controls, reflecting use in both heating and cooling applications.