Level measurement using dP cell transmitter
Level measurement using dP cell transmitter
(OP)
Hey guys,
I'm wondering if anyone can refer me to the correct ways of dP cell transmitter installation. The scenario is that I have a vent stack which has a glass type level gauge to monitor the level of water in the vent stack. (Water is used to isolate the process line to atmospheric)
I'm planning to remove the existing level gauge and replace it with a dP type level transmitter. (Or can anyone come up with a better method for this installation?). Using the existing available nozzles (2 nos), what would be the best practice to install this dP cell level transmitter.
My main concern is on the elevation of the dP transmitter.
What is the best elevation for it to be installed based on the vent stack level diagram? How is it calibrated?
How does a dP cell determine the level based on pressure differential? (Based on wet leg installation, etc)?
Hope you guys can help me on this. Thank you in advance.
I'm wondering if anyone can refer me to the correct ways of dP cell transmitter installation. The scenario is that I have a vent stack which has a glass type level gauge to monitor the level of water in the vent stack. (Water is used to isolate the process line to atmospheric)
I'm planning to remove the existing level gauge and replace it with a dP type level transmitter. (Or can anyone come up with a better method for this installation?). Using the existing available nozzles (2 nos), what would be the best practice to install this dP cell level transmitter.
My main concern is on the elevation of the dP transmitter.
What is the best elevation for it to be installed based on the vent stack level diagram? How is it calibrated?
How does a dP cell determine the level based on pressure differential? (Based on wet leg installation, etc)?
Hope you guys can help me on this. Thank you in advance.





RE: Level measurement using dP cell transmitter
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RE: Level measurement using dP cell transmitter
RE: Level measurement using dP cell transmitter
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RE: Level measurement using dP cell transmitter
I like to modify figure A2 by running the dry leg up above the top connection then back down again, this eliminates the possibility of water running into the dry leg if the level reaches the top connection.
We often add a small flow of dry gas to the dry leg if moisture builds up.
If you use a wet leg (figure A3) add a large tee or condensate pot at the top valve this ensures the level stays constant with temperature change.
Finally you need to worry about a wet leg freezing if exposed to low temperatures.
Roy
RE: Level measurement using dP cell transmitter
I trust this helps,
Mlv
http://www.coulton.com
RE: Level measurement using dP cell transmitter
RE: Level measurement using dP cell transmitter
Anyway, a good solution for this would be a Magnetic level gauge, the advantage being you have a clean and visible display, you can fit it to the existing connections and you can also install an external transmitter and/or switchs to give you a remote signal.
See the link below for a typical unit.
http://
Good luck with what you decide.