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Limit Control

LVC Watlow limit control

Basic Limit Controller

PID Watlow PM Integrated Control

Digital PID Limit Control

Multi-zone Controller Watlow EZ-Zone RM

Rail Mount Zone Limit

When Should You Use a Limit Controller?

PTSHEAT recommends a Process Limit Control in an application that is very important.  Limit controllers should be used for processes where there is a safety or quality requirement to protect a product or appliance from damage caused by excessive temperatures.

Typical Usage and Benefits

Limit devices are used in process control applications where independent limit switching for over or under temperature is required.  If the pre-set temperature limit is exceeded then the output switches to shut down the system.  This is a redundant system Loop to protect the primary Process Loop.

A limit control is often used in conjunction with a loop controller.  It will generally accept a variety of inputs such as thermocouple, RTD, or process inputs, then allowing for high or low temperature inputs to be set.  Limit controllers are used in a variety of applications, particularly industrial ovens and furnaces applications as well as by the life science industry.  A limit control should be a FM Approved device for a definite purpose OPEN or CLOSURE output.

Limit Control Applications:

Protection of process loops when a high/Low temperature or process variable will cause lost heater component, manufactured product, production down-time, or a safety situation.

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