67L120

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The mechanical thermostat 67L120 is a limiting-type temperature sensor used for controlling the temperature in heating, ventilation, and air-conditioning (HVAC) systems. It is commonly used in residential, commercial, and industrial applications to maintain a comfortable indoor environment. The principle of operation is based on thermal expansion, wherein the sensor responds to temperature changes by moving an internal actuator that opens or closes a control valve or switches a secondary power circuit. The degree of thermal expansion is determined by the material properties of the sensor.

The 67L120 thermostat consists of a cylindrical metal housing with an adjustable temperature setting dial. The housing contains a thin metal disc called a bimetal disc. The disc contains two different metals bonded together. When the temperature rises, the bimetal disc expands unequally due to the different expansion coefficients of the two metals. This creates a torque on an internal actuator and shifts the internal actuator, which is attached to the temperature setting dial. As the temperature setting is adjusted, the shift in the actuator causes the contact to open and close.

The 67L120 thermostat has two main components: a heat sensor and an open/close switch. The heat sensor is composed of a bimetallic strip that is in direct contact with the surrounding air. When the surrounding temperature rises, the different types of metal move in different directions due to their different rates of thermal expansion. This causes a shift in the internal actuator, resulting in the opening and closing of the internal switch. This switch is used to control a load, such as a fan or a valve.

The 67L120 thermostat is able to maintain a comfortable and safe environment by maintaining a preset limit. The temperature setting dial is adjusted to a specific degree according to the user’s desired temperature, and the temperature will be regulated such that the thermal expansion of the bimetallic strip will result in the internal switch closing as the temperature approaches the user limit. This will cause a switch-off of the load. On the other hand, when the temperature drops below the user’s preset limit, the internal switch will open, allowing the load to resume operation.

The 67L120 thermostat is typically used in HVAC systems. The inrush of air and any changes in the temperature can be regulated by setting the limit. The thermometer is also useful in automatic cooling systems, wherein it shuts off the cooling system at certain temperatures. The 67L120 is also useful in industrial applications where temperature needs to be carefully regulated. For instance, it can be used in the cooling systems of food-processing factories to ensure that certain goods are maintained at a safe temperature.

In summary, the 67L120 thermostat is a simple mechanical temperature sensor designed for regulating temperatures in residential, commercial, and industrial applications. It works on the principle of thermal expansion, wherein the temperature setting dial is adjusted to a specific degree by a shift in the internal actuator as the temperature rises or falls. The preset limit is then maintained as the internal switch opens and closes, keeping the environment comfortable and safe. It can be used in various tasks, including HVAC and food-cooling applications.

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