Temperature controller structure
For different temperature measurement ranges, the temperature controller having different structures should be selected, and in the temperature range of 0 ° C ~ 100 ° C, the solid expansion type temperature controller is usually used, mostly in the temperature range of 100 ° C ~ 250 ° C, mostly adopted The gas expansion temperature controller, for the temperature range www.china-natural.com
Enclosure Fan and Filter of 250 ° C, only the thermocouple or the thermal resistance thermometer can be used to convert the electrical signal into an analog electrical signal, and then convert the electrical signal to the switch quantity signal.
The working principle of the solid expansion temperature controller is that displacement is generated by the difference in length after the heat of the heat, thereby allowing the contact amount of the contact operation to output the temperature. For example, there is a temperature controller configured with bimetal (braided on indium steel sheet), since the linear expansion coefficient of the brass sheet is large, the bimetal sheet will be bent after heat . When the specified temperature is reached, a sufficient displacement is generated, disconnected from the fixed static contact point, and the switch amount signal is sent.
The gas expansion type temperature controller is operated by the principle of gas pressure thermometer. It has a temperature measurement package, and the nitrogen gas is connected to the measuring element of the pressure switch by sealing capillary. When the measured temperature reaches the specified value, the inflation pressure in the warm package makes the pressure switching.
Simply put, the measured temperature value is less than or higher than the set value, it will cause the corresponding relay closure or disconnection of the circuit.
Thereby closing or cutting the circuit. Similar to liquid level switches and pressure switches.