Series:	3455R
Part Status:	Obsolete
Circuit:	--
Switching Temperature:	--
Reset Temperature:	--
Current Rating - AC:	7.2A (277V), 15A (120V)
Current Rating - DC:	--
Tolerance:	--
Switching Cycles:	100K
Termination Style:	Quick Connect
Mounting Type:	Chassis Mount
Package / Case:	Cylinder

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Temperature Sensors - Thermostats - Mechanical

Introduction

Temperature sensors are devices that measure the temperature of a process or environment. Thermostats are one type of temperature sensor, and mechanical thermostats are the oldest type. A mechanical thermostat, identified by the catalog number 3455R82980049, contains a bi-metallic disk, contacts, and an actuator. The bi-metallic disk is the key part of this type of thermostat. It can either expand or contract when exposed to different temperatures. In this way, the disk can open or close the contacts which house the actuator. There are some advantages and disadvantages to using mechanical thermostats as temperature sensors.

Advantages of Mechanical Thermostats

Mechanical thermostats are generally reliable and have a long life span. The bi-metallic disks that they contain do not require a power source and so are especially useful in locations where electricity may not be available. They are also easy to adjust and require minimal maintenance. Because of their simple construction, they can often be handled and adjusted directly. Overall, mechanical thermostats have low costs compared to other types of temperature sensors.

Disadvantages of Mechanical Thermostats

Mechanical thermostats have a few downsides. For example, they are not as accurate as other types of sensors, and they can have a slow response time. This means that you may not get a precise measurement in certain applications. In addition, because the disk can expand or contract due to different temperatures, it can cause inaccuracies in your thermometer readings. Mechanical thermostats are also much less sensitive than other types of thermostats, so you may not be able to measure temperatures as accurately or quickly as you would with a different sensor.

Application Fields of the Mechanical Thermostat

Mechanical thermostats can be used in a variety of application fields. These include home and office thermostats, medical, industrial, and automotive applications. In medical applications, these thermostats are used to monitor temperature for medical devices, such as incubators and refrigerators. In industrial applications, mechanical thermostats are used to automatically measure temperature in process control systems, such as heating, ventilation, and air conditioning systems. In automotive applications, mechanical thermostats are used to measure engine coolant temperature and transmission fluid temperature.

Working Principle of the Mechanical Thermostat

The 3455R82980049 mechanical thermostat relies on a bi-metallic disk to measure temperature. The disk contains two strips of metal that have different expansion coefficients. When exposed to different temperatures, the disk will expand or contract in one direction, causing the contact to open or close. When the contact is open, the actuator can sense this and can either keep the space cool or warm, depending on the application. The disk will continue to expand or contract until the temperature reaches the thermistor\'s setpoint, where the contacts may open or close again as required.

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