A limit controller is a type of temperature controller that can act as a backup to the main control system. It helps to protect against over-temperature and/or under-temperature conditions. This type of temperature control device is different from alarm output. It guards against unsafe temperatures within a system.
Additional Control Loop Safeguarding
A Watlow limit controller can be an additional method of safeguarding the components in a temperature control loop, such as the sensor, heater control relay, or main temperature control. If temperature variations occur, industrial processes can be hampered or products can be damaged.
Microprocessor-based technology supports accurate, repeatable control within the system. LED displays make the viewing and adjustment of setpoints easier.
Industrial temperature limit controllers will have the agency approvals, as in UL or FM compliance. Multi-channel temperature control provides ongoing monitoring of thermocouples, RTDs or thermal switches – with each channel monitored for unique temperature limitations.