How will a differential pressure transmitter work as a level transmitter in a pressurized vessel?
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How will a differential pressure transmitter work as a level transmitter in a pressurized vessel?
A differential pressure (DP) transmitter can indeed be used as a level transmitter in a pressurized vessel. Here’s how it typically works:
Principle of Operation:
A DP transmitter measures the difference in pressure between two points. In the context of level measurement, it measures the difference in pressure between the bottom of the vessel (where the liquid or material is) and the top of the vessel (where the gas or vapor space is).
Installation:
The DP transmitter is installed in such a way that one side of the transmitter is connected to the bottom of the vessel (the high-pressure side), and the other side is connected to the top of the vessel (the low-pressure side). This creates a pressure differential proportional to the height of the liquid or material in the vessel.
Calibration:
The DP transmitter needs to be calibrated to convert the pressure differential into a level measurement. This calibration involves determining the relationship between the pressure difference and the level of the material in the vessel. This calibration typically takes into account factors such as the density of the material and the specific gravity.
Compensation for Pressure:
Since the vessel is pressurized, the DP transmitter needs to compensate for the pressure inside the vessel to accurately measure the level. This can be done by either using a separate pressure transmitter to measure the vessel pressure and then compensating for it in the level measurement, or by using a DP transmitter with a built-in pressure compensation feature.
Output Signal:
The DP transmitter typically provides an output signal, such as a 4-20 mA current signal or a digital signal, which is proportional to the level of the material in the vessel. This signal can then be sent to a control system or display unit for further processing and monitoring.
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