CONSTRUCTION OF CRITICAL TEMPERATURE ALARM SYSTEM

Department: ELECTRICAL/ELECTRONICS ENGINEERING

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ABSTRACT


The term “critical point” is sometimes used to denote specifically the vapour-liquid critical point of a material. The vapour-liquid   point denotes the condition above which distinct liquid and gas phases so not exist.
The project, the construction of critical temperature measuring instrument is aimed at measuring the critical point substances thereby obtaining its liquid-vapour critical temperature and pressure for a selected substance.
The chapter one of this project gave a brief introduction on sensors and also considering types of temperature measurement sensors. Also discussed are the aims and objective of this project as well as its scope and limitation.
The chapter two of this project gave a general over view of individuals who have successfully contributed towards the past and present technological advancement of temperature measurement.
The chapter three and four explains the principle behind this project various components used during the construction and design and analysis of this project.
Finally, conclusion, recommendation and reference followed.

CHAPTER 1


CHAPTER ONE
INTRODUCTION
A sensor is a device that measures a physical quantity and converts it into a signal which can be read by an observer or by and instrument. For example, a mercury-in-glass thermometer converts the measured temperature into expansion and contraction of a liquid which can be read on a calibrated glass tube. A thermocouple converts temperature to an output voltage which can be read by a voltmeter. For accuracy, all sensors need to be calibrated against known standards.
A sensor is a device which receives and responds to a signal or stimulus. Here the term “stimulus” means a property or a quantity that needs to be converted into electrical form. Hence, sensor can be defined as a device which receives a signal and converts it into electrical form which can be further used for electronic devices.
Sensor sensitivity indicates how much the sensor’s output mercury in a thermometer moves 1 cm when the temperature changes by 1°C, the sensitivity is 1cm/°C. Sensors that measures very small changes by changes must have very high sensitivities. Sensors also have impact on what they measure; for instant, a room temperature thermometer inserted into a got cup of liquid cools the liquid while the liquid heats the thermometer. Sensors need to the designed to have a small effect on what is measured; making the sensor smaller often improves this and may introduce other advantages.
CLASSIFICATION OF MEASUREMENT ERRORS
A good sensor obeys the following rules:
1) It’s sensitive to the measure property;
2) It’s insensitive to any other property;
3) It does not influence the measured property.
Ideal sensors are designed to be linear. The output signal of such a sensor is linearly proportional to the value of the measured property. The sensitivity is then defined as the ratio between the output signal and measured property. For example if a sensor measures temperature and has a voltage output, the sensitivity is a constant with the unit [V/K]. This sensor is linear because the ratio is constant at all points of measurement.

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