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SOR Application Note: Tank Level Using Density Measurement with Pressure and Temperature Transmitters

SOR Level Measurement Application Note

A thermal power plant wants to measure the liquid level in their water storage tank, but due to mounting restrictions and space limitations they are unable to use typical liquid level sensing technologies. The level of water in the storage tank can be measured indirectly by using a differential pressure transmitter to measure pressure and then calculating liquid level using the density. However, the density of water changes with temperature; when temperature increases the water expands in volume and vice versa. This causes the water level to rise without varying the amount of pressure being applied to the transmitter’s sensors. If only a pressure measuring device is used, the system will lack the temperature data required for correctly adjusting the density calculations. Temperature compensation is needed to accurately determine the level of water within the process.

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