JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABAD

Prerequisite

Mathematics-I, Thermodynamics, Basic of Electrical and Electronics Engineering.

Course Objectives:

• 1. To impart the basic knowledge of the functional blocks of measurement systems.
• 2. To provide technical understanding of various Temperature and pressure measuring instruments.
• 3. To expose the students to know the working of various physical variable Level, Flow, Speed and Acceleration measuring instruments.
• 4. To understand the working of various physical and Electrical variables Stress, Humidity, Force, Torque and Power measuring instruments.
• 5. To understand the concept of control system and calculate transfer functions of mechanical and translational systems with different techniques.

Course Outcome

After completion of the course, the student will be able to:

• 1. Know the basic knowledge of the functional blocks of measurement systems.
• 2. Describe the working of various physical variable Temperature and pressure measuring instruments.
• 3. Explain the working of various physical variable Level, flow, Speed and Acceleration measuring instruments.
• 4. Understand the working of various physical and Electrical variables Stress, Humidity, Force, Torque and Power measuring instruments.
• 5. Understand the concept of control system and calculate transfer functions of mechanical and translational systems with different techniques.

UNIT - I

Definition – Basic principles of measurement – Measurement systems, generalized configuration and functional description of measuring instruments – examples. Static and Dynamic performance characteristics– sources of errors, Classification and elimination of errors. Measurement of Displacement: Theory and construction of various transducers to measure displacement – Using Piezo electric, Inductive, capacitance, resistance, ionization and Photo electric transducers; Calibration procedures.

UNIT - II

Measurement of Temperature: Various Principles of measurement-Classification: Expansion Type: Bimetallic Strip- Liquid in glass Thermometer; Electrical Resistance Type: Thermistor, Thermocouple, RTD; Radiation Pyrometry: Optical Pyrometer; Changes in Chemical Phase: Fusible Indicators and Liquid crystals. Measurement of Pressure: Different principles used- Classification: Manometers, Dead weight pressure gauge Tester (Piston gauge), Bourdon pressure gauges, Bulk modulus pressure gauges, Bellows, Diaphragm gauges. Low pressure measurement – Thermal conductivity gauges, ionization pressure gauges, McLeod pressure gauge.

UNIT - III

Measurement of Level: Direct methods – Indirect methods – Capacitive, Radioactive, Ultrasonic, Magnetic, Cryogenic Fuel level indicators –Bubbler level indicators. Flow measurement: Rotameter, magnetic, Ultrasonic, Turbine flowmeter, Hot – wire anemometer, Laser Doppler Anemometer (LDA).

Measurement of Speed: Mechanical Tachometers, Electrical tachometers, Non-contact type Stroboscope; Measurement of Acceleration and Vibration: Different simple instruments – Principles of Seismic instruments – Vibrometer and accelerometer using this principle- Piezo electric accelerometer.

UNIT - IV

Stress-Strain measurements: Various types of stress and strain measurements –Selection and installation of metallic strain gauges; electrical strain gauge – gauge factor – method of usage of resistance strain gauge for bending, compressive and tensile strains – Temperature compensation techniques, Use of strain gauges for measuring torque, Strain gauge Rosettes. Measurement of Humidity: Moisture content of gases, Sling Psychrometer, Absorption Psychrometer, Dew point meter. Measurement of Force, Torque and Power- Elastic force meters, load cells, Torsion meters, Dynamometers.

UNIT - V

Elements of Control Systems: Introduction, Importance – Classification – Open and closed systems- Servomechanisms – Examples with block diagrams – Temperature, speed and position control systems- Transfer functions- First and Second order mechanical systems

TEXT BOOKS:

• 1. Principles of Industrial Instrumentation & Control Systems/Chennakesava R alaavala, - Cengage Learning/1st Edition, 2009.
• 2. Basic Principles – Measurements (Instrumentation) & Control Systems /S. Bhaskar/ Anuradha Publications

REFERENCE BOOKS:

• 1. Measurement Systems: Applications & design, E. O. Doebelin, TMH, Tata Mcgraw Hill/6th Edition, 2017.
• 2. Instrumentation, Measurement & Analysis, B.C. Nakra & K.K. Choudhary, TMH, 4th Edition, 2016.
• 3. Experimental Methods for Engineers / Holman
• 4. Mechanical and Industrial Measurements / R. K. Jain/ Khanna Publishers.
• 5. Mechanical Measurements / Sirohi and Radhakrishna / New Age International, 3rd Edition, 2013.