The temperature control meter is widely used in the field of heating equipment temperature control equipment. It is also a common control component in the basis of electrical engineering. So what is the principle of temperature control instrument control? How to connect?
The temperature control meter is an integrated intelligent temperature control instrument. It uses a full digital integrated design, with a temperature curve programmable or fixed -point constant temperature control, multiple PID adjustment, output power limit curve programming, manual/automatic switching, soft start, alarm alarm Switching volume output, real -time data query, and computer communication functions, combine the number display temperature instrument and ZK crystal tube voltage adjustment device, integrate the temperature measurement, adjustment, and drive in one. Class crystal gate pipe load.
Classification of temperature control meter
What are the types of temperature controllers: sudden temperature controller, liquid -rising temperature controller, pressure temperature controller, electronic temperature controller, digital temperature controller
Digital and electronic temperature controllers are not subdivided now. The above types are mechanical temperature control instruments. The application is not particularly wide. Only special occasions will be used. The following two are electronic formulas. Control instrument.
Electronic temperature controllers: The electronic temperature controller is measured by resistor and temperature sensing. Generally, platinum wire, copper, tungsten wire, and thermistor are used as temperature measurement resistors. These resistors have their own advantages and disadvantages. Most household air conditioners use thermal resistance type. Electronic temperature controller has the advantages of stable and small volume, and now it is used in more and more fields.
The principle of control of the temperature control meter
In the temperature control line of PID intelligent temperature control, the temperature signal given by the temperature controller obtains the temperature probe is used to use the pulse -type temperature when it is about to reach the set temperature. Therefore, the temperature control is very accurate. (Percent with) I (Points Action) D (micro -division action), which is the operating characteristics of the PID control instrument.
The control principle diagram of the temperature control meter
The picture below is the control principle diagram of the temperature control meter. From the figure, we can see the more classic control method. The power supply enters the temperature control meter. Increase the solid -state output, from the temperature controller output current signal to the solid relay, and the solid relay to control the rear -end power supply, and then control the heater heating.
With the principle diagram of the control, we can carry the wiring. There will be a wiring chart on the back of the temperature controller. We take this temperature controller as an example:
Among them, the 1-2 end is the power cord with a input range of 100-240V. Generally, 220V is used;
The 3-5 end is the output terminal, and the 4-5-end SSR solid-state relay signal output terminal, which directly connects to the solid-state relay, has positive and negative, and can connect to the communication contactor. By the power supply passing through the No. 4 terminal;
The 6-8 end is the output alarm end, which is generally a low-limit alarm, that is, the actual temperature is lower than the set temperature, and there are also NC and NO. Pay attention to the connection method;
The 9-11 terminal is the output alarm end, which is generally a high limit alarm, that is, the actual temperature is higher than the set temperature, and there are NC and NOs. Pay attention to the connection method;
13-15 is a temperature sensor access terminal. The temperature sensor is divided into electrical puppets and resistance. The wiring chart is shown in the figure. When selecting the type of temperature sensor type, you must check whether the temperature control instrument is applicable.
With the wiring diagram, we can apply the temperature controller to the actual circuit. The picture below is a very good
, Family heating wiring chart for your reference.