What is the temperature controller?
and the temperature controller is any device that turns on and off the device in response to temperature changes. Different methods, including metals, chemicals or gases, can use to measure temperature changes. Temperature control devices may differ from a simple domestic thermostat for heating or air conditioning control, to complex systems that control chemical reactions in industrial plants.
The heating and air conditioning device is connected to the thermostat inside the building. Until the end of the 20th century, the thermostats used the mercury switch to control the system. This temperature controller used a bi-metal belt, which was a twisted belt of two metals fused along their length. As the temperature changes, two metals are expanding or withdrawing with slightly different speeds and the coil changes the shape.
Mercury was installed in a glass tube located at one end of the bi-metal coil. The liquid mercury moved back and forth inside the tube as the temperature changed and activated the heating or cooling control circuits. Only the bi-metal belt was influenced by the temperature; Mercury remained unchanged. However, the use of mercury disappeared at the end of the 20th century due to its toxicity.
chemicals can be used to control the temperature controller, either by changing the size, phase or paired pressure, and some chemicals expand and withdraw with temperature changes. When sealing in the piston tubes at one end, the temperature changes can cause the piston to move and activate the switch. Phase change concerns chemicals of change from solids to liquid or gas liquid. The vehicle thermostats used to control the engine temperature use the wax seal that becomes liquid when heated by the engine, and opens the valve that allows the engine coolant to circulate. This turns back to the solid when the engine cools down.
Par pressure can be used to check the temperature in two ways. One type of temperature control measures steam pressure from solvent UTa tube and attached to a chemical process tank or pipe. As the temperature rises, the steam pressure of the solvent also increases and can activate the switch.
The second type of vapor drive is a metal hydride controller. Metal hydrides contain hydrogen molecules that occur when hydrogen temperatures rise. Increasing hydrogen pressure can push against the piston and be used as a temperature drive. Firefighting systems can use these devices to open and close the spray heads for water control. Once the fire is fired, the hydrogen gas returns to the metal, the pressure of the gas decreases and the head of the sprayer closes.
Electronic temperature control began to replace mechanical devices at the end of the 20th century. A devices called Thermistors, which are drivers sensitive to temperature without moving parts that provide narrow temperature range control. Thermistors may be connected to the control circuits that turn on and turn off the heating or cooling systemsAnd they are used in many digital thermostats.