Instrumentation Questions

Zero Elevation Level Measurement Troubleshooting Quiz for Process Industries (Advanced 25 MCQs with Answers)

Sundareswaran Iyalunaidu
By Sundareswaran Iyalunaidu

In closed tank differential pressure (DP) transmitter applications, especially when using wet leg arrangements, measuring the zero elevation level is very important. In the process industries, it is very important to fix mistakes in calibration, elevation adjustment, and transmitter placement in order to get precise level measurements. Engineers often have to deal with problems including filling the wrong reference leg, signal drift, a mismatch in specific gravity, or installing the transmitter incorrectly. This exam is for experienced instrumentation engineers and process control experts who wish to test and improve their knowledge of how to fix level measurement problems using zero elevation approaches. Look at the diagrams for more advanced ways to solve problems.

Zero Elevation Level Measurement Troubleshooting Quiz – 25 Advanced MCQs for Process Industry Engineers

Zero Elevation Level Measurement Troubleshooting Quiz for Process Industries (Advanced 25 MCQs with Answers)

Using DP transmitters with wet leg referencing to measure zero elevation level is a common way to find levels in pressured vessels. In real plants, controlling elevation incorrectly can lead to big mistakes in calibration. This advanced quiz is all about troubleshooting problems and real-world examples in process industries, which helps professionals learn more about how to solve problems.

1 / 24

What happens if you think that the SG of the wet leg liquid (SG2) is lower than it really is during transmitter calibration?

2 / 24

Why is the specific gravity (SG) of wet leg liquid so important for measuring zero elevation?

3 / 24

What is the most typical error people make while filling a wet leg when troubleshooting zero elevation?

4 / 24

What makes the signal drift in a wet leg zero elevation setup?

5 / 24

A DP transmitter is set up below the HP tapping point at a height of zero. What extra head pressure needs to be taken into account?

6 / 24

What does “h1” mean in the diagrams?

7 / 24

What should you do if process SG1 changes a lot when you are trying to fix it?

8 / 24

What troubleshooting procedure helps find vapor that is stuck in the wet leg?

9 / 24

What troubleshooting procedure helps find vapor that is stuck in the wet leg?

10 / 24

What do you generally set transmitter LRVs to when the elevation is zero?

11 / 24

Which of the following needs to be checked often while fixing a wet leg?

12 / 24

What is the likely problem if the transmitter indicates 20 mA at the actual 50% level?

13 / 24

What is the purpose of a catch tank in a wet leg system?

14 / 24

What kind of failure causes a continual low-level indicator at zero elevation?

15 / 24

Why do wet leg installations need drain valves?

16 / 24

What’s wrong if the transmitter output stays the same even when the tank level changes?

17 / 24

What is the one calibration step that is different for zero elevation setups than for dry legs?

18 / 24

What should you do first when a transmitter shows a negative level in a closed tank?

19 / 24

A process engineer sees that the readings in zero elevation are changing. What do you think is the main cause?

20 / 24

Why is it better to have zero height when measuring the level of a closed tank with a wet leg?

21 / 24

What problem is likely to happen if the transmitter is located above the HP tapping point with no elevation?

22 / 24

What process condition would need a lot of wet leg refills?

23 / 24

What process makes sure that the zero elevation is steady following transmitter maintenance?

24 / 24

If a transmitter shows the right zero but the wrong span, what does it mean in troubleshooting?

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