Home » Displacer Level Transmitter Question & Answer
Question For You

Displacer Level Transmitter Question & Answer

Displacer Level Transmitter

Question :

The principle of buoyancy may be used to create a level transmitter instrument, generating an output signal proportional to the change in weight of a “displacer” rod suspended in a liquid:

buoyancy level transmitter

Often, the displacer is housed inside its own “cage” for easy removal from the process, as shown above, or it may be inserted directly into the process vessel like this:

displacer level transmitter problems

If the vessel is open and the liquid inside is turbulent due to mixing or other agitation, a stilling well serves the same purpose as a cage:

stilling well for level transmitter

To calibrate such an instrument, it must be isolated from the process liquid. Sometimes this means simply closing block valves and draining the cage. Other times it means removing the displacer mechanism from the vessel entirely. But once the displacer is hanging dry, there is the problem of simulating a 100% condition for calibration purposes.

Describe a way to make the displacer “think” it is fully submerged in process liquid when it in fact is hanging freely in the air. Explain how you would be able to precisely and accurately simulate this condition, as well as any given condition of partial displacer submersion for that matter.

Answer :

One way to simulate a full condition is to use a hand scale:

displacer level transmitter Dry Calibration

Also Read : Displacer Level Transmitter Dry Calibration Procedure

Similar Articles:

Related Articles

Solenoid Valves Questions & Answers – 2

S Bharadwaj Reddy

Calculate the Temperature of 4 Wire RTD

S Bharadwaj Reddy

Resistance Temperature Detector (RTD) Questions – 1

S Bharadwaj Reddy

How to Connect Proximity Switch (Source Type) to Make LED ON ?

S Bharadwaj Reddy

Motor Trip Logic using PLC Programming

S Bharadwaj Reddy

Programmable Logic Controller (PLC) Questions and Answers – 2

S Bharadwaj Reddy

Leave a Comment

This website uses cookies to improve your experience. We'll assume you're ok with this, but you can opt-out if you wish. Accept Read More

WordPress Image Lightbox