Most electric devices and appliances have control systems. They control various parameters, aspects, and performance of the appliance or device. Two controllers that are in most devices are process controllers and temperature controllers.

In this guide, we are going to focus on process and temperature controllers. So, it will be wise to go through this informative guide before you purchase these controllers.

What is a controller?

What controllers do is simple: controllers manage process setpoint by making decisions based on input from sensors and controller input.

Controllers still have limitations so it requires help from the process input or process itself. You don’t want your controllers to stop working if the sensor signal fails. This is because it will cause a much bigger problem rather than just having faulty sensor readings. After all, controllers can’t function without proper inputs to read from.

Controllers in a nutshell

Controllers in a nutshell

As we already know, process controllers manage process systems. In an ideal sense, controllers monitor your system and make decisions based on information from sensors. For example, controllers can be used to monitor the temperature of furnace gas and regulate its flow based on furnace temperature.

However, controllers will not function well if you don’t have good sensor information. For example, controllers can easily detect furnace temperature fluctuations because controllers read temperature changes every few seconds to minutes rather than only reading temperature once before making decisions.

An ideal process controller needs 3 things to work properly:

Process input

Temperature controllers will need temperature information from your sensors

Process output

Controllers will regulate the process by increasing or decreasing process flow (flow of furnace gas in our case)

Controller input

Controllers operate based on control algorithm and programming. For example, controllers must be programmed to start operating at a specific temperature and stop at another predetermined temperature.

Even though controllers are designed to regulate your process, some controllers will not completely work on their own. For example, controllers can’t recognize problems by themselves; they need help from the process input.

If you have some sensors that map out your process curve, controllers can read that information and act accordingly.

In summary: controllers monitor the process and make decisions accordingly.

What are temperature controllers?

What are temperature controllers

Now that we know what process controllers are, let’s see how it works. In this section, we discuss temperature controllers and their function.

Temperature controllers have a vital role in temperature control systems. For example, temperature controllers can be used to control the temperature of your house if you have a pool heater or any other heating appliances.

These controllers can also be used to monitor and control the temperature in ovens and other heating devices because these controllers provide the best accuracy and precision.

There are many types of temperature controllers and we are going to look at them:

– Thermostatic controllers

– Digital controllers

– Programmable controllers

– Sensors controllers

Thermostatic controllers

Thermostatic controllers are among the most common controllers as they can be easily programmed and work well with electric heating systems. The downside of thermostatic controllers is that it only works on liquid-filled heat transfer circuits.

Digital controllers

Digital controllers have great accuracy so they are preferred for accurate temperature measurements, but the downside of digital controllers is that you need to pay close attention when programming controllers. The look of controllers can be confusing in the beginning but once you learn how controllers work, you will find it easy to use controllers.

Programmable controllers

These controllers are similar to digital controllers because these controllers have touchpads so you can program them easily. In addition, some controllers have large LCDs so you can easily monitor controllers. However, controllers have the downside of being hard to set up in the beginning until you get used to controllers.

Sensors controllers:

As we all know, controllers require process input and sensors controllers use temperature sensors instead of normal temperature controllers. Sensors controllers work well with furnaces and heating systems, but controllers’ downside is that controllers are expensive.

How do temperature controllers work?

Now that you have learned about controllers, it is time to discover how controllers work. In this section, we discuss the process input/output of controllers and their control algorithm.

As soon as temperature controllers start operating, they check for controller input. For example, controllers will check to see if your furnace is running.

When controllers are ready for process input, controllers have 2 options: measuring temperature or measuring current.

Measuring temperature controllers measure the temperature of the process output and then controllers map out a numeric value that can be used as controller input.

These controllers are different from each other in form or function. For example, you can find digital controllers that have more complex programming and graphical interface compared to thermostatic controllers which operate on simple dials. All of these controllers can be used for heating purposes.

On the other hand, controllers can’t operate on their own. For example, controllers need input to work properly. If you are using thermostatic controllers for furnace gas control, then sensors provide controllers with information to make decisions.

In short, temperature controllers are used to monitoring and control the temperature in electronic systems using heating appliances or any other heating systems.

There are controllers for different purposes and controllers can be used to heat a room or a pool. Controllers work well with furnaces and heating systems but controllers cost more compared to other temperature controllers.

What is a process controller

What is a process controller?

Process controllers monitor the input and output of a process. Process controllers are widely used all around the world to control processes in different electronic devices and appliances.

There are different types of process controllers. These include:

– Programmable logic process controllers

– Process controllers

– Sensors process controllers

– Digital process controllers

Programmable controllers: controllers are widely used today for process monitoring. These controllers work well on heating systems, but controllers require some programming skills to operate controllers.

Programmable controllers have large LCDs so controllers are easy to use for process monitoring.

Process controllers: controllers can be used instead of programmable controllers because controllers have some predefined process control programs that don’t require any programming skills.

However, if you want to make changes in the programmed parameters then controllers may not work properly when you change an input/output ratio.

Sensors process controllers: this type of controller uses temperature sensors to monitor processes. Sensors controllers have widely used today for heating systems but sensors controllers cost more than other types of controllers.

Digital Process Controllers: like programmable controllers, digital process controllers need programming skills to use these digital process controllers in electronic devices and appliances.

What is the importance of process control?

Numerous reasons make it necessary to install process controllers in devices and appliances. Here are some of those reasons:

Increase the system’s performance: controllers make sure that the systems used stay on track, controllers make it possible to increase the system’s performance.

Consumption of energy is reduced

Controllers operate process controllers with minimum consumption of energy so controllers are good for the environment, controllers can also reduce your cost in consuming electricity.

System operation becomes easy

Controllers work automatically so controllers don’t require any sort of control over process controllers. System operation is made simple due controllers have self-diagnostic capabilities which means that process controllers will let you know if there is a problem with the system or not.

Improve automation

Controllers improve automation in different devices and appliances. Automation makes controllers easy to use controllers.

Controllers work automatically so controllers don’t require any sort of manual interference for process monitoring.

Controllers reduces the chances of human errors causing problems on electronic systems, this is why controllers are important.

Minimize inefficiencies

Controllers minimize inefficiencies by adjusting process controllers according to the system’s inputs so controllers are good for business. They also eliminate cases of reworks that could have been caused by low-quality works done on the system.

Increase production quality

Controllers increase production quality because controllers work on their own without any interference from humans. If controllers are not installed then it is difficult to achieve high productivity.

Enhances safety

Controllers enhance safety in different devices and appliances controllers work automatically so controllers don’t require any sort of manual interference for process monitoring controllers reduce the chances of human errors causing problems on electronic systems.

Minimize instrumentation costs

Controllers minimize instrumentation cost controllers have a minimum number of sensors controllers don’t require a lot of wiring because controllers communicate process controllers over controllers’ network.

Strengthen security: 

Can strengthen security controllers are able to monitor process controllers in controllers’ absence controllers can halt operational processes if controllers sense any unplanned change in the system.

Reduce downtime

Controllers reduce downtime by reducing the number of man-hours required for fixing mistakes caused due to human errors controllers reduce the need to stop production at certain intervals controllers also improve workflow.

Increase profitability

controllers increase profitability process controllers are good for business because controllers make it possible to monitor process controllers in controllers’ absence controllers can halt operational processes if controllers sense any unplanned change in the system this increases productivity and it reduces loss due to production.

Factors to Consider when buying controllers

Before you buy controllers, it is vital to pay attention to these key factors:

Controller price

Controllers have different price controllers are priced according to controllers’ capabilities so controllers aren’t always pricey controllers. So, you need controllers’ prices to match controllers’ functionality.

Controller qualifications

controllers offer controllers with different capabilities so controllers are not equal in terms of features, when you buy controllers make sure that controllers have the right qualifications for your system.

Controller application

controllers can be used in many appliances and devices controllers are available in many sectors like controllers are used controllers in telecommunications controllers, controllers in automation controllers, etc. You need controllers’ applications to match controllers’ purposes.

User interface

Controllers have a user interface that controllers use when controlling process controllers, controllers have an easier to understand user interface so learning how to operate controllers is easy so learning how to operate process controllers should be easy too.

Controller configuration

Process controllers might need complicated configurations and modifications before you can successfully install them in your system, but not with controllers. Controllers don’t require many changes and infrequent updates because of the ability of process controllers to self-diagnose and repair themselves.

Data accuracy

Data must be accurate because data affects decision making and controls, if data isn’t correct then it will make the whole process controllers’ control system difficult controllers must have accurate data controllers read process controllers and controllers use controllers to make decisions so controllers can also send commands if required.

Controller operation

Controllers must operate smoothly because smooth operations of process controllers allow efficient process monitoring and controlling which improves production quality. If controllers stop working, then the whole system’s balance will be disrupted and this leads to a great loss in production. Process controllers should work smoothly at all times.


Controllers need to be compatible controllers can communicate controllers can also work with controllers’ own controllers and controllers’ network.


Process controllers might be bulky and difficult to carry around or if controllers are not portable that makes it very inconvenient for control engineers because controllers will require a lot of time to make the necessary configuration changes, which will result in a loss of production and revenue. The controller needs to be portable so controllers should allow process controllers system setup at the remote location.

Controller architecture

There are different controller architectures controllers can come in block diagrams or ladder diagrams. Process controllers have both block diagram or ladder diagram style controllers usually use block diagrams when using graphical programming languages.


Controller manufacturer

You should be keen on the manufacturer where you plan to buy from. Ensure that you buy from reputable and reliable controller manufacturers in China.

ICRFQ: Controllers sourcing agent in China

If you are seeking to buy controllers in China, consider going through a reliable and reputable sourcing agent. That is exactly what ICRFQ is. ICRFQ is known to offer controllers sourcing services at cost-effective prices.

ICRFQ has been in the electronics business for years and it has built up an enviable reputation in the controllers sector. So if you are looking for controllers, don’t forget to check ICRFQ out.

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