Unit 3

Question 1

Formula for absolute pressure?

Answer 1

Pabs = Patm + Pg

Question 2

3 types or bourdon tubes

Answer 2

C-type, Spiral, Helical

Question 3

Pressure transducer or sensors

Answer 3

Used to measure pressures ranging to very low to very high gauge pressures.

Question 4

What affects deflection of the bourbon tubes tip?

Answer 4

• material properties
  -length of the tube
  -thickness
  -cross sectional area

Question 5

Bellows

Answer 5

Bellows-type Sensing elements for the measurement of low-intermediate pressures and vacuums with atmospheric Or vacuum reference.

Offer good sensitivity, are linear, and can produce large forces

Question 6

Max deflection <= 10% of bellows length. Flexibility of bellows is affected by the

Answer 6

• material properties
  -number of convolutions
  -diameters
  -thickness

Question 7

Diaphragm

Answer 7

Produced a small but linear deflection relative to the applied differential pressure

Question 8

Pressure gauge/transmitter accessories

Answer 8

• safety blowout (solid front/blowout back feature)
  -oil filled case
  -pigtail or siphon
  -snubber/pulsation dampener
  -chemical seal / diaphragm seal