Temperature Controller/Alarming System

All of the temperature control systems are designed for the specific purpose and that is to control the temperature within an environment that could alarm the authorities as well. The temperature controller indicator system is also one of such temperature control system however different because of its alarming system. The temperature controller indicator system works as monitor for the temperature of the environment, this system also helps in controlling the temperature within the set limits. On the other hand, if the system fails to control the temperature, then it has the ability to alarm as well. The alarming system will let the others know about the exceeding limits of the temperature. The temperature controller and the indicator systems have been applied to the number of appliance that we normally use in our daily life. It is used in the situations where then objects or the products are needed to be kept in a certain temperature in order to keep them warm or cold, the temperature controller and the indicator systems are used. This system helps in maintaining the desired temperature and alarm in case if the temperature increases or decreases from the set values of the temperature (GlobalSpec, n.d.). There are different kinds of the temperature controller depending upon the requirements of the environment in which they will be applied.

Talking about the functions of the temperature controller indicator system is that it is like the other temperature controller systems. As it is clear with the purpose of the product that is why it is used, the next thing to know about it is to know what functions this system can perform when it is applied to some environment. The basic function of this system is to monitor the temperature rise and fall in the environment. Only monitoring is not all that the system will be doing, the other function of this system is that it will be displaying the temperature on the display in order to keep a manual check on the temperature changes (Instrumart, n.d.). This system is specifically designed to be applied in industrial environment. Moreover, there is also option available to set the desired limits for the temperature in this system. It means that the temperature limits can be defined with the help of inputs.

The temperature controller and indicator systems operates in a very efficient way in order to control the temperature and alarm the authorities when the temperature crosses the threshold. There are two main parts of the system one is the hardware and the other one is the software part. The hardware part contains all the hardware that is used like the temperature sensors that is called Temperature Sensing Unit (LM35), the keyboard, converter that will be used to convert the analog signals into digital, LED and the microcontrollers. The hardware part need to be programmed in order to make it operate properly and record the temperature and alarm in the dangerous situation when the threshold will be crossing. Moreover, this system can be divided into three parts depending upon the units and their operations that they will be performing in the system. It can be considered as a simple programming unit that takes the input, performs operations on it and then provides the output. There are also input, operating and output units of this system. The input unit of the system consists of Keyboard and Temperature sensing unit. The keyboard is used to input the temperature limits that are required in the industrial areas. These limits are very important because there is need to define the limits so that the temperature controller indicator system could alarm in case of increase in the temperature (Couton, n.d.). On the other hand, Temperature sensing unit is used to receive the temperate from the ambient in order so that the processing can be done. The second part of the unit that can be called as the operating part contains two elements that are Analog to Digital Converter of ADC and Microcontroller. Temperature is the analog entity, so it needs to be converted into digital in order to perform the further processing. Once then temperature analog signals are converted into Digital, then the signals are sent to microcontroller that will perform the function. The microcontroller will check if the temperature is within the limit set for the ambient temperature. If the temperature is within the limit, then the controller will not alarm otherwise it will alarm (Holland, 2004). The last part of the unit is the output unit that contains the LED and LCD. LED is used to alarm that the recent temperature has crossed the threshold while LCD is used to display the recent temperature in the ambient.

1.  Problems

There are certain problems in this temperature controllers and indicator system that is causing number of issues in its operations. The main problems that are prominent in this system are as follows.

If the temperature decreases then there is no alarm by the system

There is no change in the temperature when it is needed

The ADC is not functioning appropriately

Looking at the problems, if there is one of the problem exists in the system, then it cause number of problems in the industrial environment. This system should work efficiently in order to be applied in other industries as well. If the system does not alarm with the help of LED applied on it, then it means that there is no use of the system. If the system fails to alarm then it will be hard to control the aftereffects of temperature change (Holland, 2004). In the same way, the temperature control is also required to change the temperature of the industrial area according to the external environment. It should be done with the help of microcontroller. The microcontroller is dependent on the information being provided by the Analog to Digital Converter. However we were able to find out the reasons for such problems in the system. Once those problems were identified it was easy to eradicate them from the system as well.

2.  Technical Reasons for the Problems

If there is a decrease in the temperature and there is no alarm on the system, then there might be different problems in this case. Starting from the input system the temperature sensing unit might not be working properly and it will be providing false values to the microcontroller that is programmed and in turn, the normal temperature will be displayed on the LCD. In this way the temperature will be lying within the defined limits by the keyboard. The temperature sensing unit is very important in this temperature control unit because the readings taken by it are the deciding point for the whole system. On the other hand, there might be issues with the programming of the microcontroller as well. The microcontroller were programmed with the help of Assembly language, a minor logical error in it can cause the whole system to failure. The other reason for not alarming operation of this system might me issue with the LED (MOHAMMAD A.K. ALIA, n.d.). However the LED was working perfect the reason for the issue in alarming was because of the programming the microcontroller who had to take the decisions whether to alarm the system or not.

The other issue was also related to the microcontroller. The issue was that if there is a change in the external environment then it should also bring a change in the internal environment. In this temperature control alarming system, we had used open loop circuit which had no link with the external environment (MOHAMMAD A.K. ALIA, n.d.). The reason that might be related to again with the temperature sensing unit or the microcontroller. However it was clear from the above problem that again the issue was with the microcontroller programming. In this case, both are the reasons for the failure in change of temperature of this system.

The third problem was that Analog to Digital converter was not working. As it is clear that the whole decisions in the system will be taken on the basis of the digital signal sent to the microcontroller. During the testing of this system, it was seen that the LCD showed some unknown errors. The reason for such errors was that the ADC was not able to convert the analog signals of the temperature to the digital signals and send it to the microcontroller. Till the microcontroller will not be getting any digital value from the ADC, it will not be able to take any decisions like change in the temperature or alarm the system.

3.  Problems Solutions  

Once it was clear in case of the first problem that the main issue was with the microcontroller programming. In this case the microcontroller was needed to be programmed again in accordance with the requirements of the system that was it should alarm the system in case if the temperature goes up or down from the threshold. The microcontroller was programmed once again in order to operate appropriately (MTS, 2008). The formation of the system is quite complicated process in which first the hardware parts of the systems should be embedded on the board on their right place and the second step is very important and that is to make those hardware work in accordance with each other and carryout the desired functionality.

Once the microcontroller was reprogrammed and started functioning properly, it was also helpful in the solution of the second problem. However the second problem was also because of the temperature sensing unit. It means that the temperature sensing unit was also replaced and hence the second problem was also resolved.

The solution of the third problem that was because of the Analogue to Digital converter was also resolved by the replacement of ADC. Once the ADC was also replace the whole system was expected to be working perfectly as all the problems were resolved as well. It is very long process as the identification of the problem is very important as it resolves the problems to some extent as well.

4.  Conclusion

The temperature controller/alarming system is one of the basic necessarily for the industrial environments now a days. It is very important because the temperature needs to be kept according to the requirements of the environment. If the temperature in the working industrial environments are not kept under control then it can be a serious problem to the people working in the same environment as well. The systems have been designed with the different requirements depending upon the requirements of the industries. There are also temperature controller sensing environment in which the temperature is also recorded in order to keep a complete track about the temperature changes in the environment. However this kind of system is quite expensive, but it can be implemented as well. The system that we had designed is all about the temperature controller and alarming that is in low budget as well so that the small industries can also implement them as well. This system is not capable to keep record of the temperature changes in the environment or keep record when the environment temperature crosses the threshold. The production of such alarming and temperature control system is the system that is must to be applied in almost every industry. The same system can be modified as well like it can alarm also with the help of creating some sounds as well when embedded a speaker with it as well. It is quite efficient as well it will alarm the maximum number of people so that they can check the area and find out the reason. On the other hand, the automatic temperature change is also very important. There can be no specific person sitting in the industrial area who will keep changing the temperature of the internal environment. In order to overcome this problem again the temperature control system is the best alternative as it will increase or decrease the temperature of the environment with the help of increasing or decreasing the temperature as programmed according to the requirements. The temperature controller and alarming system is one of the best inventions of the time.

1.  References

Azbil, 2012. http://williamlabs.com/support/publications/irreversible-temperature-indicators-as-an-audit-tool-for-assuring-blood-product-temperature-control/. [Online]
Available at: http://www.azbil.com/products/bi/iap/ss/fi/SS2-KFT100-0100-02.pdf
[Accessed 7 4 2014].

Couton, n.d. Temperature controller questions and answers. [Online]
Available at: http://www.coulton.com/QandA_controller
[Accessed 7 4 2014].

GlobalSpec, I., n.d. Temperature Indicators Information. [Online]
Available at: http://www.globalspec.com/learnmore/sensors_transducers_detectors/temperature_sensing/temperature_instruments_indicators
[Accessed 7 4 2014].

Holland, A., 2004. Trouble shooting Temperature Control Equipment. [Online]
Available at: www.mrclab.com/Media/Doc/Temp_Measuring9.pdf‎
[Accessed 7 4 2014].

Instrumart, n.d. Temperature Controller Basics Handbook. [Online]
Available at: https://www.instrumart.com/pages/283/temperature-controller-basics-handbook
[Accessed 7 4 2014].

Lennart E. Logdberg, D. D. K. S. C. V. D., 2014. Irreversible Temperature Indicators as an Audit Tool for Assuring Blood Product Temperature Control. [Online]
Available at: http://williamlabs.com/support/publications/irreversible-temperature-indicators-as-an-audit-tool-for-assuring-blood-product-temperature-control/
[Accessed 7 4 2014].

MOHAMMAD A.K. ALIA, M. K. A. Z., n.d. A CLOSED-LOOP TEMPERATURE CONTROL SYSTEM. [Online]
Available at: http://www.inele.ufro.cl/apuntes/LabView/Manuales/Loop%20_Closed%20_T%20_With%20_Pid%20_In%20_Labview.pdf
[Accessed 7 4 2014].

MTS, 2008. Temperature Controller. [Online]
Available at: http://www.mts.com/ucm/groups/public/documents/library/mts_004866.pdf
[Accessed 7 4 2014].

Tellurex, 2010. An Introduction To Temperature Control. [Online]
Available at: http://www.tellurex.com/pdf/introduction-to-temperature-control.pdf
[Accessed 7 4 2014].

Wika, 2003. Temperature Indicating Controller, Model CS3S. [Online]
Available at: http://www.wika.com.ar/upload/ba_cs3s_6355.pdf
[Accessed 7 4 2014].