How to Identify the Features of Level Measurement Technologies?

How to Identify the Features of Level Measurement Technologies? Remember the principles of operation of each type of instrument. Based on that, determine what the features of each type are.

Identifying the Features of Level Measurement Technologies

Sight Glass

Find the answers to the questions mentioned below:

1. Can it be used for measuring the level of liquid or solid materials?
2. Can it be used for measuring liquid-liquid interfaces?
3. Does its calibration depend on the fluid property such as density?
4. What are the special advantages?
5. What are the special disadvantages?

Answers

1. Only liquids
2. Both ports must be submerged
3. No
4. Simple - cheap
5. Manual display only – or no output signal

Float

Find the answers to the questions mentioned below:

1. Can it be used for measuring the level of liquid or solid materials?
2. Can it be used for measuring liquid-liquid interfaces?
3. Does its calibration depend on the fluid property such as density?
4. What are the special advantages?
5. What are the special disadvantages?

Answers

1. Liquids yes. Solids only if accumulated by an automatic winch
2. Yes. The density of the float must be correctly adjusted.
3. No
4. Relatively simple - cheap
5. Needs guides or other devices for stabilization in a tall vessel. Does not work well in turbulent processes

Hydrostatic Level Measurement (DP with Direct Contact)

Find the answers to the questions mentioned below:

1. Can it be used for measuring the level of liquid or solid materials?
2. Can it be used for measuring liquid-liquid interfaces?
3. Does its calibration depend on the fluid property such as density?
4. What are the special advantages?
5. What are the special disadvantages?

Answers

1. Only liquids
2. Yes, both ports must be submerged
3. Yes, density!
4. Relatively simple - reliable
5. The DP sensor must resist the corrosion of the process fluid

Hydrostatic Bubbler (Dip Tube)

Find the answers to the questions mentioned below:

1. Can it be used for measuring the level of liquid or solid materials?
2. Can it be used for measuring liquid-liquid interfaces?
3. Does its calibration depend on the fluid property such as density?
4. What are the special advantages?
5. What are the special disadvantages?

Answers

1. Only liquids
2. Yes, both ports must be submerged
3. Yes, density!
4. Relatively simple - reliable
5. The DP sensor must resist the corrosion of the process fluid

Displacer Level Measurement Feature

Find the answers to the questions mentioned below:

1. Can it be used for measuring the level of liquid or solid materials?
2. Can it be used for measuring liquid-liquid interfaces?
3. Does its calibration depend on the fluid property such as density?
4. What are the special advantages?
5. What are the special disadvantages?

Answers

1. Only liquids
2. Yes, displacer must be fully immersed in water
3. Yes, density!
4. Simple - reliable
5. Susceptible to vibration; if the process fails, the displacer may get stuck inside the cage

Ultrasonic Level Measurement Feature

Find the answers to the questions mentioned below:

1. Can it be used for measuring the level of liquid or solid materials?
2. Can it be used for measuring liquid-liquid interfaces?
3. Does its calibration depend on the fluid property such as density?
4. What are the special advantages?
5. What are the special disadvantages?

Answers

1. Yes
2. No
3. Yes, speed of sound through the transmission medium
4. No contact with the process liquid required
5. Requires a significant change in density for operation (e.g. foam layers may disrupt measurement). Irregular shapes inside the vessel may cause scattering or false echoes

Non-Contact Radar Level Measurement Feature

Find the answers to the questions mentioned below:

1. Can it be used for measuring the level of liquid or solid materials?
2. Can it be used for measuring liquid-liquid interfaces?
3. Does its calibration depend on the fluid property such as density?
4. What are the special advantages?
5. What are the special disadvantages?

Answers

1. Yes
2. No
3. Yes, speed of light through the transmission medium
4. No contact with the process liquid required
5. Requires a significant change in permeability for performance (e.g. some materials like wood chips may be difficult to detect). Irregular shapes inside the vessel may cause scattering or false echoes. The penetration coefficient of the material(s) above the measured level affects its accuracy. It changes with the density of that material.

Guided Wave Radar Level Measurement Feature

Find the answers to the questions mentioned below:

1. Can it be used for measuring the level of liquid or solid materials?
2. Can it be used for measuring liquid-liquid interfaces?
3. Does its calibration depend on the fluid property such as density?
4. What are the special advantages?
5. What are the special disadvantages?

Answers

1. Yes
2. Yes, should be said yes
3. Yes, speed of light through the transmission medium
4. The wave helps ensure a strong echo signal
5. The waveguide must resist corrosion or other stresses from the process fluid. Requires significant transmission change in permeability for level or interface detection. Irregular shapes inside the vessel may cause scattering or false echoes. The penetration coefficient of the material(s) above the measured level affects its accuracy. It changes with the density of that material.

Magnetostrictive Level Measurement Feature

Find the answers to the questions mentioned below:

1. Can it be used for measuring the level of liquid or solid materials?
2. Can it be used for measuring...