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Lab 3

The document describes an experiment to measure and compare the time constants of different temperature measuring devices when exposed to increasing heat. Students measured the temperature readings of bi-metal thermometers, vapor pressure manometers, mercury thermometers, alcohol thermometers, thermistors, PT100 thermocouples, and type K thermocouples over time as water heated up. The results were recorded in a table showing that different devices reached 63.2% of the temperature change at different rates.

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Oliver Raj
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341 views5 pages

Lab 3

The document describes an experiment to measure and compare the time constants of different temperature measuring devices when exposed to increasing heat. Students measured the temperature readings of bi-metal thermometers, vapor pressure manometers, mercury thermometers, alcohol thermometers, thermistors, PT100 thermocouples, and type K thermocouples over time as water heated up. The results were recorded in a table showing that different devices reached 63.2% of the temperature change at different rates.

Uploaded by

Oliver Raj
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
Available Formats
Download as DOCX, PDF, TXT or read online on Scribd
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MESB 333 - Engineering Measurement Lab

Formal Report (Individual)

Experiment 3: Temperature Measurement

Section: 1A

Name: Muhammad Mirza Danial Bin Zainee (ME095542)

Group Member:
1) Ahmad Fahmi Maula Mansor (ME0955454)

2) Ahmad Riaz Imran Bin Roslan (ME 095458)

3)

4)

Lecturer: Puan Fevillia Nurnadia Binti Adria Syaifoel

Due Date: 2/11/2017

1
Table of Content

2
Experiment 1: Time Constant

Summary

Objectives

The objective of this experiment is to:

1) To analyse the difference in time constant register by different type of temperature


measuring device with reference to mercury filled thermometer
2) To study the relationship between resistance and temperature

Theory

Temperature is measure of hotness. Together with a measure of thermal mass of a body it


gives an indication of the total thermodynamics energy that body contains. Temperature is
commonly denoted by the units of Fahrenheit (), Celsius () and Kelvin (K). There are
several types of thermal measuring device. The ones that were used in this experiment are the
Bi-Metal thermometer, Vapour Pressure Manometer, Mercury Filled Thermometer, Alcohol
Thermometer, Type K resistance thermometer, Thermistor and the PT100 thermocouple.

The thermal response is one of the key characteristics to consider when selecting the thermal
measuring device for a particular application. The thermal response is the time taken for the
time reading of the thermal measuring device to change by 63.2% of the step change. For any
given thermal measuring device the thermal response will be a constant value regardless of
the step change. Hence, thermal response is also known as Time Constant.

3
Equipment

Figure 1: Experiment apparatus setup

Legend:

A = Type-K thermocouple

B = Pt 100 thermocouple

C = m V meter

D = Mains switch 240VAC

E = EL CB/MCB

F = Heater Switch

G = Blower Switch and speed controller

H = Pt 100 temperature meter

I = Type K temperature meter

J = Bi- metallic thermometer

K = Vapor compression thermometer

L = Vacuum Flask

M = Hot water pot

N = Whirling Psychrometer

O = Thermistor temperature meter

P = Mercury filled thermometer

Q = Alcohol filled thermometer

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Procedure

1) The water pot is fill half full with room temperature water.
2) The cover of the hot water pot is closed to ensure the water can be cooked safely.
3) All of the thermal measuring device is put in place in the hot water pot.
4) The initial temperature of the water is measured by all of the thermal measuring device
and recorded.
5) The main switch is turned on along with the power to the hot water pot
6) The temperature of the water is recorded with a two minute interval
7) The experiment is stopped when all of the thermal measuring device gave a reading of 100
degree celcius.

Data, Observation, Results

Time Thermometer (0C)


(Min) Bi Metallic Vapor Pressure Mercury Alcohol Type K Thermistor PT 100
0 24 28 25 15 22.2 25.5 24.8
2 25 29.5 29 20 26.6 25.8 25.5
4 28 34 43 31 37.7 35.8 29.9
6 36 43 48 45 58 48.7 39
8 48 56 68 56 63.2 61 51.3
10 61 70 78 72 75.5 71.8 66.1
12 74 82 96 86 85.3 82 76.3
14 86 95 102 98 95.9 93.2 93.2
16 97 101 102 96 96.2 94 99.7
18 97 102 102 96 96.2 94.3 100.6

Table 1: Experiment 1

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