This section provides overview, applications, and principles of controllers. Also, please take a look at the list of 305 controller manufacturers and their company rankings.
A controller is a device used to control a machine automatically. It has sensors to monitor physical parameters such as temperature, humidity, pressure, and flow rate and applies feedback so that these are equal to a set target value.
It has a part that displays the current value of the parameter you want to adjust and the value you have set, and there are analog and digital systems.
Those with a digital system are specifically called digital controller. They are also sometimes referred to as indicating controller.
Controllers are often used for temperature control in general and mostly used to control the temperature of water tanks and, in combination with inverters, air conditioners.
In addition to temperature, they are also used to control humidity in dehumidifiers and humidifiers and to regulate the flow of carbon dioxide gas in CO2 incubators for cell culture, among other applications.
Some can also be used in conjunction with a computer to log monitored data and verify the performance of the control system.
The controllers consists of a sensor part to monitor physical parameters and a feedback part to adjust the current value to the target value.
The sensor part is selected according to what is to be measured, such as a thermometer for temperature or a hygrometer for humidity.
The monitored value and the set target value are compared by a comparator or the like built into the circuit to determine the input value to the control section for feedback. There are various methods of control operation to provide feedback.
*Including some distributors, etc.
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