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Calibration of a Chromel-Alumel Thermocouple

In: Science

Submitted By LStrauss
Words 957
Pages 4
| Calibration of a Chromel-Alumel Thermocouple | | Module Title: Engineering ApplicationsModule Tutor: | Student Name: | Submission Date: |

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Contents Objectives 3 Introduction 3 Apparatus 3 Theory 3 Results 4 Discussion 4 Conclusion 6 References 6

Calibration of a Chromel-Alumel Thermocouple
Objectives
* Use a thermometer to tell the changing temperatures of water * To become familiar with the principles of temperature measurement
Introduction
The purpose of this experiment was to measure the change in voltage in boiling water (electromotive force) against the temperature (measured by a thermometer) when cold water was added at stages.
The voltage readings were taken using a Chromel-Alumel thermocouple.
1
6
5
2
Apparatus
1. Immersion heater and power supple 2. 500ml beaker half full with water 3. 3
1000ml beaker full with water 4. Thermometer 5. Thermocouple 6. Digital multimeter 7. Clamp and stand
7
4

Theory
Refer to lab sheet for method used.
A thermocouple is thermoelectric temperature sensor (which means it can measure temperature using electricity). A thermocouple consists of two wires that are made of different metals to one another which are coupled at the measurement junction and extended to the reference junction. [1]
[1]
A thermometer is “an instrument for measuring and indicating temperature, typically one consisting of a narrow, hermetically sealed glass tube marked with graduations and having at one end a bulb containing mercury or alcohol which extends along the tube as it expands.”[2]
Results
Temp (°C) | Voltage (mV) | 99 | 3.04 | 90 | 2.64 | 84 | 2.4 | 78 | 2.17 | 72 | 1.9 | 64 | 1.65 | 61 | 1.44 | 57 | 1.3 | 54 | 1.2 | 49 | 0.99 | 48 | 0.94 | 45 | 0.81 |

Gradient= dydx= 3.04-0.8199-45=0.04 (2dp)
Eqn of

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