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INST 202 > Level Tables Disadvantages > Flashcards

Level Tables Disadvantages Flashcards

1
Q

Blocking distance

A

Ultrasonic, Radar, Guided Wave Radar

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2
Q

Turbulent surfaces

A

Ultrasonic, Radar, Guided Wave Radar

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3
Q

Minimum dielectric constant

A

Radar & Guided Wave Radar

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4
Q

Foam is an issue

A

Ultrasonic

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5
Q

Foam can be an issue

A

Radar & Capacitance Level Measurement

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6
Q

Vapors/gas above the liquid

A

Ultrasonic

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7
Q

Temperature difference between liquid and sensor

A

Ultrasonic

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8
Q

No vacuum (10 psia), no high pressures (44 psia)

A

Ultrasonic

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9
Q

Minimum density required

A

Ultrasonic

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10
Q

Must take into account tank design

A

Radar & Guided Wave Radar

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11
Q

Minimum dielectric constant

A

Radar & Guided Wave Radar

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12
Q

Heavy foam can be an issue

A

Guided Wave Radar

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13
Q

Many versions (conductor/insulator)

A

Capacitance Level Measurement

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14
Q

Probe coating (chemical compatibility)

A

Capacitance Level Measurement

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15
Q

Ground reference tube (non-metallic)

A

Capacitance Level Measurement

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16
Q

Re-calibration with different media

A

Capacitance Level Measurement

17
Q

10 pF minimum span

A

Capacitance Level Measurement

18
Q

Most expensive level device

A

Radiometric (gamma) Level Measurement

19
Q

Requires extra documentation and paperwork (swipe tests)

A

Radiometric (gamma) Level Measurement

20
Q

Dependent on country-specific regulations

A

Radiometric (gamma) Level Measurement

21
Q

Maintenance (mechanical, and have moving parts)

22
Q

Inaccuracy due to coating/buildup (float may stick, too much buildup can effect set point)

23
Q

Corrosion of float (ex: holes)

24
Q

Passive system (won’t know if float sticks)

25
Q

Sensitive to foam/air bubbles

A

Ultrasonic Gap Switches

26
Q

Coating/buildup can cause failure to sense liquid level (solids or coating can result in device malfunction)

A

Ultrasonic Gap Switches

27
Q

Calibration for specific liquid (being measured)

A

Thermal Dispersion Switches

28
Q

Slow speed response

A

Thermal Dispersion Switches

29
Q

Coating can be an issue (effect proper operation)

A

Thermal Dispersion Switches

30
Q

Buildup/coating an issue (can change resistance)

A

Conductivity Point Switches

31
Q

Calibration needed (frequently)

A

Conductivity Point Switches

32
Q

Conductive liquids only

A

Conductivity Point Switches

33
Q

Not as well-known as the others

A

Vibrating Fork Point Switches

34
Q

Too much buildup on one time (failsafe mode)

A

Vibrating Fork Point Switches

INST 202 (12 decks)

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