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Measuring > Test 1 > Flashcards

Test 1 Flashcards

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1
Q

1 atm in psi

A

14.7 PSI

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2
Q

What is 1 psi in “H2O

A

27.7”H20

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3
Q

Three accessories for pressure gauges

A

Oil filled, snubber, and chemical seal

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4
Q

Use for snubbers on pressure gauges

A

Reduce oscillation in measurements (restricts flow in and out of gauge)

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5
Q

Use for oil fill accessory in pressure gauge

A

Reduce effects of plant vibrations (reduces shock and extends gauge life)

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6
Q

Use for chemical seal

A

Protect internal components from flow (corrosive, hot, slurry)

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7
Q

1 psi to “Hg

A

2.04 “Hg

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8
Q

1 psi to kPa

A

6.895 kPa

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9
Q

1 bar to psi

A

14.5 psi

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10
Q

1 bar to kPa

A

100 kPa

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11
Q

1 “H2O to mmHg

A

1.87 mmHg

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12
Q

1 “H2O to cmH2O

A

2.54cmH2O

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13
Q

1 kg/cm^2

A

14.22 psi

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14
Q

1 atm to bar

A

1.0135 bar

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15
Q

1”Hg to “H2O

A

13.61 H2O

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16
Q

Does volume matter for pressure?

A

No

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17
Q

What is elevated based range?

A

When the LRV is below zero

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18
Q

What is zero based range?

A

When the LRV is zero

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19
Q

What is LRV?

A

Lower Range Value

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20
Q

What is URV?

A

Upper Range Value

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21
Q

What is suppressed based range

A

When the LRV is above zero

22
Q

What is the first step in a lab procedure?

A

Obtain the instruction manual(s)

23
Q

What mainly determines the cost of a pressure gauge?

A

Accuracy

24
Q

What are bourdon tubes usually made of?

A

Stainless steel (varying grades) or brass

25
Q

What are the three types of bourdon tubes?

A

C spring, spiral, helical

26
Q

What is the purpose of pressure elements?

A

Create mechanical motion from input pressure

27
Q

Accuracy of C spring

A

+/- 1% of span

28
Q

Typical range of C spring

A

0-10 psi, up to 0-20k psi

29
Q

What does the c shape in a c spring want to do as pressure is applied to it?

A

Straighten out

30
Q

Accuracy of spiral bourdon tube

A

+/- 0.5% of span

31
Q

What is span

A

URV-LRV

32
Q

Typical range of spiral bourdon tube

A

0-10 psi, up to 0-100k psi

33
Q

Accuracy of helical bourdon tube

A

+/- 1% of span

34
Q

Typical range of helical bourdon tube

A

0-30, up to 0-80k

35
Q

Min and max ranges of bellows element

A

Min: 0-2.5”H2O, Max: 0-2000 psi

36
Q

What easily damages bellows elements

A

Too much pressure

36
Q

Accuracy of bellows element

A

+/- 2% of span

37
Q

Min and Max range of diaphragm type element

A

Min: 0-0.5”H20, Max 0-3000 psi

38
Q

Accuracy of diaphragm type element

A

+/- 1% of span

39
Q

When is a pneumatic pressure transmitter used

A

When a signal is needed in a control loop

40
Q

What does a pneumatic pressure transmitter reproduce process pressure as?

A

Proper signal pressure

41
Q

What is a flapper nozzle used for

A

Convert mechanical motion to standard pneumatic signal

42
Q

What is the heart of near all pneumatic transmitters/controllers

A

Flapper nozzle/error detector

43
Q

What is the standard pressure applied to a fixed orifice/restriction

A

20 psi

44
Q

Three Types of Manometers

A

U Tube, Well, Incline

45
Q

Characteristics of U tube manometer

A

Clear tube bent into a u shape, labeled with graduated scale placed between vertical columns/legs, with scale marking going up above and below zero point

46
Q

Characteristics of Incline type Manometer

A

Reservoir serving at one end, measuring column at an angle from the horizontal to reduce vertical height

47
Q

Characteristics of Well type Manometer

A

Vertical glass tube connected to metal well, measuring liquid in well at same level as zero point on the tube scale

48
Q

What is a barometer

A

Type of manometer used to measure atmospheric pressure

49
Q

What is a diaphragm

A

a
mechanical pressure
sensor consisting of a thin,
flexible disc that flexes in
response to a change in
pressure

49
Q

What is a capsule

A

a mechanical pressure sensor consisting of
two convoluted metal diaphragms with their outer edges
welded, brazed, or soldered together to provide an empty
chamber between them

Measuring (4 decks)

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