Location of Level Sensor 1

[controlnovice]

We have an application with an existing vertical, round tank, with dish bottom.

4" diameter outlet nozzle about 4" long( located at center of bottom dish).

The 4" piping connected to the outlet drops about 6" and turns 90 degrees and runs along the floor about 20 ft to pump.

I'd like to install an existing 4" flanged DP transmitter in the 4" pipe to determine level in the tank. We're not concerned with knowing level during emptying or filling the tank. We are only concerned with level when level is static.

How far away from the bottom of the tank in the 4" line can I install the sensor and still read level?

Does it have to be directly at the 90 degree elbow or can it be any distance away from the bottom tank nozzle along the 4" pipe?

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This is normally the space where people post something insightful.

 

[DRWeig]

As long as you're only concerned at no-flow conditions, you can be anywhere below the tank, even 20 feet away.

You just have to be sure to account for the difference in elevation between your transmitter and the bottom of the tank (subtract it out).

During flow through the pipe, you'll have a pressure drop -- but if your velocity is low enough, it might be a small enough pressure drop to still get accurate readings.

Good on ya,

Goober Dave

 

[roydm]

I'm with Dave,
The closer you get it to the tank the less effect flow will have on the reading. You could easily guesstimate the flow effect by looking up a pipe pressure drop table.
Roy