How does the temperature controller work?
The temperature controller accurately controls the temperature without operator participation, and the temperature control system depends on a controller. It accepts a temperature sensor such as thermocouple or thermal resistance input. Tamper-proof Thermostat It provides an output to the control unit than the control temperature, or set value required by the actual temperature. This controller is part of the entire control system, analyzes the entire system, and selects the right controller.
A switch controller is the simplest form, temperature control device. There is no intermediate state from the output or shutdown of the device. A switch controller switch output is only when the temperature exceeds the set value. Heating control, the output is when the temperature is lower than the set value, and the above setting value is turned off. Because the temperature exceeds the set value to change the output state, the temperature of this process will continue to cycle, from above the set value, and below the back. In this case, the circulation occurs rapidly and prevent damage to the contactor and valve, the switch difference, or "lag," add to the controller operation. This difference requires the temperature before setting a certain amount of output, which will be closed or re -. The clutch moves to prevent the output from "jitter" or a fast, continuous switch, if the above and the settings of the bicycle cycling are very fast. Switch control is usually unnecessary for an accurate control. The energy that cannot be handled in the system is opened and closed. The quality of the system is so large, the temperature change speed is very slow, or the temperature alarm. A special type of control switch is used to alarm restriction controller. The controller uses a closed relay, which must be manually reset and used to turn off a process at a certain temperature.
The purpose of proportional control is to eliminate circulation and switch control. The average power consumption of the proportional controller is close to the setting value of the heater. This affects the slowing heater so that it does not exceed the setting value, but it will be close to the setting value and maintain a stable temperature. This proportional role can be short through the time interval between the output and closing. This "real -time" different ratio "" time "" time "and" time control temperature. The action of the ingredients occurs at a "proportion" set temperature. In this area, the function of the controller is a switch unit, and the output is exactly (band below) or completely closed (the above band). However, in the frequency band, the output is the difference between opening and closing the measurement, from the setting. At the set value (the proportional zone of the middle point), the output: the ratio is 1: 1; the time and the stop time are equal. If the temperature is set further, the temperature difference between the different proportion of the closing time. If the temperature is lower than the set value, the output will no longer be quilt; if the temperature is too high, the output will be closed.
The third controller type provides proportional points and differential control, and the proportional points are different. The controller combines proportional control and adjustment, which helps changes in the automatic compensation system. These adjustments, points and guides are in the time unit; they also mention the countdown and reset rate. The proportion, the terms of points and the guide must be adjusted or adjusted to a specific system use test and error. It provides three control types that are most accurate and stable control. It is best to use a relatively small quality of the system and the increase in energy increased by the rapid reaction of changes. This is recommended to automatically compensate the controller in the system load changes and the controller will automatically change the setting value, or a certain amount of energy, or quality control due to frequent changes.