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Description 305 Manufacturers
Zygology
Zoeller Company
Yokogawa Test & Measurement Corporation
X-Microwave, LLC
WPT Power Corporation
Workmaster
Wisconsin Oven Corp.
Wine Guardian
Weldon Solutions, Inc.
Weldlogic, Inc.
Weldcoa
Wavelength Electronics

305 Controller Manufacturers in 2022

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.

Table of Contents

What Is a Controller?

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.

Uses of Controllers 

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.

Principle of Controllers 

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.

  • ON/OFF operation: The current value is kept near the target value by repeatedly turning the output ON when the current value is lower than the target value and OFF when the current value is higher.
  • Proportional operation (P-operation): Control output is proportional to the difference between the current value and the target value. However, it fluctuates relatively widely around the target value. If this average value is taken, it may stabilize at a point slightly off the target value. The average value at this time is called the offset.
  • Integral operation (I-operation): When an offset appears in a proportional operation, this operation changes the output amount to eliminate the offset. It is used in combination with proportional operation.
  • Differential action (D action): An action that changes the amount of output so that it immediately returns to the original value when the current value changes abruptly.
    The combination of P, I, and D operations is called PID operation, which combines the benefits of each operation.

List of 305 Controller Manufacturers

*Including some distributors, etc.

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