Using Pressure Transmitters as Level Transmitters

akashjain,

I'm happy to see that you've graduated to lower case for your normal "conversational" tone.

Now you need to work on those questions.

If your tank is vented, you can put the pressure transducer at the bottom of the tank and use the values to get a rough idea of level.

Of course, you provide no meaningful information.

Take a look at some other posts and try to learn from them.

And, don't call us dear!

It is possible and common place to use a pressure transmitter to measure level but as mentioned before only in tank or vessel that is vented to atmosphere.

The level is inferred from the from the hydrostatic head or pressure exerted on the sensor, in this case your pressure transmitter. The transmitter needs to be calibrated based on

1. the desired height (H) of liquid in the vessel to be measured.

2. the specific gravity (SG) of the liquid in the tank.

Hydrostatic pressure = H x SG

e.g. if the desired height to be measured is 100", the zero level point is determined to be at the level of the sensor then the transmitter range and the liquid in the tank is water (i.e. SG=1) then the transmitter would be calibrated to;

0" WC to 100" WC.

Actually a differential pressure transmitter can be used to measure the level of a liquid in a pressurized tank. You simply connect one tap to the top of the tank and make the other pressure tap to the bottom of the tank. The pressure differential will correspond to the density of the fluid and the level.

Obviously, this only works in systems where gravity and/or acceleration is a constant or the value must be taken into consideration in the pressure/level calculation.

If the tank is stationary and vented to atmospheric pressure at the top then an gauge pressure transmitter may be used in the same way.

Variations in the density of the fluid will also cause deviations from the calibration if not accounted for in the calculation.