Series:	5100
Part Status:	Active
Circuit:	SPST-NC
Switching Temperature:	235°F (113°C)
Reset Temperature:	205°F (96°C)
Current Rating - AC:	3A (120V), 1.5A (125V), 1.5A (240V), 2.5A (240V)
Current Rating - DC:	3A (32V)
Tolerance:	±5°F (±2.8°C)
Switching Cycles:	6K
Termination Style:	Screw Terminal
Mounting Type:	In Line
Package / Case:	Cylinder

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Temperature Sensors - Thermostats - Mechanical

Thermostats that use a 05 1AAA235A-20 5A mechanical temperature-sensing element are common in the control industry, often because it is a cost effective and reliable solution. The majority of mechanical thermostats use bi-metal or resistance-temperature detectors (RTDs) for sensing and heating, but there are a few other types of mechanical temperature sensors used in thermostats as well. This article discusses the application fields of mechanical thermostats and the principles they use in operation.

Application Field

Mechanical thermostats are found in a variety of industries, both residential and commercial, and are employed for many different applications. In residential use, these thermostats are commonly found in furnaces, air conditioners, and water heaters, serving to control the internal temperature. They are also used to control the temperature in temperature-sensitive products like food, beer, and pharmaceuticals. In commercial applications, mechanical thermostats are used in control systems that are connected to motors, boilers, and other types of industrial equipment. The thermostat monitors the temperature and signals an alarm when the temperature reaches a dangerous level. Some of these thermostats are integrated with safety systems within the building that shut down machinery in hazardous conditions.

Working Principle

Mechanical thermostats employ bi-metal or RTD sensing elements to detect temperature changes. Both systems work in similar ways; a bi-metal or RTD temperature-sensing element is attached to a spring-loaded switch. When the temperature rises, the element expands, pushing the switch and activating a signal that can then be used to control a valve, fan, motor, or other device. Bi-metal sensing elements have two layers of dissimilar metals that expand and contract at different rates when exposed to heat or cold. When the temperature changes, these layers move relative to each other, causing the switch to be triggered. RTD sensors rely on the resistance of a metal element, typically platinum or copper, that changes with temperature and produces a signal that is proportional to the temperature and can be used as an input for a controller.

Conclusion

Mechanical thermostats have a wide range of applications in residential and commercial sectors. They use bi-metal or RTD sensing elements that expand and contract with temperature changes, which causes a switch to be triggered and signals that can be used to control a variety of devices. These cost-effective and reliable solutions are widely used in many industries, making it easier to regulate and monitor temperature in temperature-sensitive products.

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