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Disadvantages of electronic temperature sensors
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Introduction:
The control and monitor of accurate and reliable measurement of temperature is necessary in various fields such as industrial , environmental, agriculture , food, biotechnology and clinical sectors etc. furthermore, research labs, clean rooms, and nuclear reactors are the environments which require continuous temperature monitoring a due to their highly dependence on temperature levels. The role of sensors and the errors which may affect the measurement of temperature are critical for temperature measuring devices. The sensor choice may play a large role in on the cost effectiveness of the system. Every temperature measurement application is according to their different requirements and the effect of noise on the resolution is necessary to be considered. Noise issues and presence of errors are more critical from design point of view and selection of type of sensors.
Different ways of measurement of temperature are available such as resistance temperature detectors, integrated circuit sensors, infrared sensors, liquid n gas thermometers, gas thermometers, thermocouples, thermostats, thermostat etc. In this report the integrated circuit using LM35 temperature sensor temperature sensing method is described due to important advantage over other sensor types such as low cost, high accuracy, linear output signal, small size, calibration, reliability, and low power consumption.
Literature review:
Types of Temperature sensors:
The most commonly used type of temperature sensors detects heat or temperature. These types of temperature sensors vary from simple thermostat devices, which are used to control the domestic water heating system, to highly sensitive semiconductor types which are used to monitor and control the compl...
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...genic regions.
Thermometers:
They are liquid expansion devices for temperature measurement. Liquid may be mercury or alcohol. Expansion coefficient of alcohol is more. Mercury device has certain limitations for safely transportation and shipping. Mercury is considered as environmental contaminant, so breakage of thermometer is hazardous.
Infrared sensors:
Infrared sensors are non-contacting type of sensors. For example, if we hold up a typical infrared sensor to the front of our desk without contact, sensor will tell us the temperature of desk due to its radiation... in non-contacting measurement of ice water, it will measure slightly lower the expected temperature reading [2].
Bibliography
[1] [Online]. Available: http://www.electronics-tutorials.ws/io/io_3.html.
[2] [Online]. Available: http://www.wwdmag.com/water/seven-basic-types-temperature-sensors.
The purpose of this lab was to calculate the specific heat of a metal cylinder
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The solutions with ice and salt were all able to drop to a temperature below 0°C within 10 minutes, while the ice solution never dropped below 0°C across all 5 trials. This indicate that salt is the variable that contributed to the decrease in temperature since the initial temperature of the thermometer, the amount of ice, and the room temperature, were all held constant.
A thermometer * A clamp * A Bunsen burner * A stop clock Method = =
A hot plate is acquired and plugged in and if left to warm up. Fill two beakers with 0.075kg of water and record the temperature using a thermometer and record it. Place one of the beakers onto the hot plate and drop one of the metal objects in. Wait for the water to boil and wait two minutes. Take the object out of the water and drop it into the other beaker. Take the temperature of the beaker and record the rise in temperature.
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The molar specific heats of most solids at room temperature and above are nearly constant, in agreement with the Law of Dulong and Petit. At lower temperatures the specific heats drop as quantum processes become significant. The Einstein-Debye model of specific heat describes the low temperature behavior.
Measure and record the temperature of the water in the Styrofoam cup. Leave cardboard cover on until the heated metal is ready to be transferred into the calorimeter.
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- Temperature was measured after and exact time i.e. 1 minute, 2 minutes, 3 minutes.
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When the liquid level in both arms is the same, the pressure of the sample of gas inside the closed end must equal the pressure of the external atmosphere since the downward force on the two columns of liquid is then equal. When the liquid levels are unequal, the pressures must differ. The difference in pressure can be measured in units of length of the vertical column of liquid. The mm Hg, or its modern version the torr, originated in this use of the manometer. Mercury is particularly convenient for use in manometers (and barometers) because at room temperature it has low vapor pressure, does not wet glass, and has a high density. Other liquids such as linseed oil or water have also been used in manometers.