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Principles of Measurement

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LESSON 1

Principles of Measurement

Let the Games Begin!

- Measurement of temperature and pressure
- Units of measurement
- Measurement devices

- Introduction to Naval Engineering
- Principles of Naval Engineering

- Why essential to proper operation of propulsion plants?

- An indication of the internal energy contained in a substance
- Mono-Atomic Gases: Linearly proportional
- Poly-Atomic Gases: translational, rotational and vibrational kinetic energy.

- Temp is a measure of but not directly proportional to internal kinetic energy.

- Relative Scales
- Fahrenheit (°F)
- Celsius (°C)

- Absolute Scales
- Rankine (°R)
- Kelvin (K)

(°F) = 9/5*(°C) +32

(°C) = 5/9*[(°F) –32]

(°F) = (°R) – 459.67

(°C) = (K) – 273.15

- Definition: Force per unit area
- Units of measurement
- Pounds force per square inch (psi)
- Inches Hg or inches H2O (“Hg)
- Atmospheres (atm)

- Gage pressure (PSIG)
- Absolute pressure (PSIA)
- Vacuum pressure (PSIV) or (in Hg)
- Atmospheric pressure (14.7 psi)

Absolute Pressure = Atmospheric Press. + Gage Press.

Vacuum = Atmospheric Pressure - Absolute Pressure

30 PSIA

15.3 PSIG

GAGE

PRESSURE

(PSIG)

ABSOLUTE

PRESSURE

(PSIA)

Atmospheric Pressure

14.7 PSIA

0 PSIG

(Average at Sea Level)

0 In. Hg

VACUUM

(in. Hg)

0 PSIA

29.92 In. Hg

- Expansion Thermometers
- Liquid in glass
- Bimetallic
- Filled system/distant reading

- Pyrometers
- Thermocouple
- Resistance
- Radiation and optical pyrometers

- Liquid in Glass
- Bimetallic
- Filled System/Distant Reading

- Liquid in Glass
- Bimetallic
- Filled System/Distant Reading

- Liquid in Glass
- Bimetallic
- Filled System/Distant Reading

- Liquid in Glass
- Bimetallic
- Filled System/Distant Reading

- Thermocouple
- Resistance
- Radiation and Optical

- Thermocouple
- Resistance
- Radiation and Optical

- Thermocouple
- Resistance
- Radiation and Optical

- Thermocouple
- Resistance
- Radiation and Optical

- Manometers
- Bourdon tube
- Bellows gage

- Manometers
- Bourdon tube
- Bellows gage

- Manometers
- Bourdon tube
- Bellows gage

- Manometers
- Bourdon tube
- Bellows gage

Questions?