300400280068

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Temperature Sensors - Thermostats - Mechanical

Mechanical temperature sensors are generally divided into two categories based on the operating principle. One category is that of thermostats, which use temperature sensing mechanisms to mechanically respond to the temperature they are exposed to, and the other category is thermistors, which use temperature-sensitive materials that cause electrical resistance to change in relation to the temperature. In this article, we will look at the application fields and working principles of 300400280068 thermostats.

Application Fields

300400280068 thermostats are commonly used in industrial process control systems, such as boilers, ovens, HVAC systems, refrigerators, water tanks, heaters, and machine tools. They are used to detect any unusual changes in temperature and take corrective action to keep the system within acceptable temperature parameters. They can also be used in non-industrial applications, such as in home heating systems and thermostats in household appliances such as water heaters, air-conditioners, and even coffee makers.

Working Principle

300400280068 thermostats are bimetallic temperature sensors that work by having two dissimilar metals expand and contract at different rates when heated. The rate of expansion is proportional to the difference in temperature. This expansion is used to move a switch contact along a bimetallic strip and when the temperature of the sensor reaches a pre-set threshold, the switch contacts change position and activate an attached device. This can be a warning light, an alarm, or an accessory such as a fan.

The switch is activated when a given temperature is reached, and is then held in that position until the temperature drops below a second pre-set limit. This second limit is referred to as the “differential” and determines the accuracy of the thermostat. The differential is adjustable depending on the application and can be in any range from 1 to 10 degrees Celsius, depending on the type and brand of the thermostat.

Bimetallic thermostats are relatively simple and inexpensive sensors compared to other types of temperature sensors. They are reliable and durable but are not suitable for applications that require high accuracy or very fast response times. They are, however, capable of switching power ratings of up to 1 kW and operating on differential settings of up to 10 degrees Celsius.

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