In the current measurement and design of the tank oil level, the differential pressure transmitter is more popular in the use of radar level gauge or floating differential pressure transmitter 2 ball, buoy, steel band level meter and so on. Although the radar level gauge has high precision but the cost is high, buoys, floats and other liquid level gauges are troublesome to install and maintain. The differential pressure level gauge is widely used in closed vessels such as boiler steam drums, but the measurement result is not a true liquid level. Therefore, there is little application for the measurement of the liquid level in an oil tank. In fact, the precise liquid level of the oil tank is not very important. The actual level of understanding is not the level of liquid. Instead, the actual level (ie, tonnage) of the oil in the tank can be known by measuring the liquid level to prevent flooding. Therefore, it is also a good choice to use the differential pressure method to measure the liquid level (actually tons). Because the current application of differential pressure transmitter is very mature, such as differential pressure transmitter 1151,3051 and EJA, the technology is very complete, the precision can reach 0.075 level, and the price dropped sharply, the performance price is higher.
Differential Pressure Transmitter As the name suggests, the differential pressure transmitter measures the pressure difference, that is, △P=ρgΔh. Since the tank is often cylindrical, the area S of its cross-section circle is constant, then, the weight G = △ P · S = ρg △ h · S, S unchanged, G and △ P is proportional to the relationship. That is, as long as the ΔP value is accurately detected, and inversely proportional to the height Δh, even if the oil volume expands or contracts when the temperature changes, the actual liquid level rises or falls, and the detected pressure remains unchanged. If the user needs to display the actual liquid level, media temperature compensation can also be introduced to resolve.

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