Although the debugging accuracy of radar target flowmeter is high, the cost is also high. However, the installation and maintenance of level meters such as buoys and floating balls are inconvenient. Differential pressure type liquid level gauge is widely used in closed vessels such as boiler drum, but the measurement result is not the real liquid level, so it is rarely used in the design scheme of oil tank liquid level measurement. In fact, the precise liquid level of the oil storage tank in petrochemical plant is not very critical. What the customer needs to know is not the liquid level, but the specific total number of oil products (i.e. tons) in the oil storage tank according to the measured liquid level, so as to avoid being full. Therefore, it is a good choice to analyze and select differential pressure method to measure liquid level (specifically tons). At present, the application of differential pressure transmitter is very perfect, such as 1151, 3051 and EJA differential pressure transmitter. The technology is very sound, the accuracy reaches 0.075, and the price is greatly reduced, and the characteristic price is higher. In general, the differential pressure transmitter is used to measure and verify the oil products in and out of the warehouse. Because the accuracy of the steam flowmeter is limited, it can only be 0.2 level high. The differential pressure transmitter also needs to measure the density calculation, and its results are usually in and out, which leads to the dispute cases of measurement and verification. Nowadays, the measurement result of the oil storage tank is tons, and the accuracy can be 0.2 or 0.1. Therefore, compared with the capacity type steam flowmeter, the measurement verification result of the differential pressure transmitter is more accurate. Although the deviation of measurement results is very large due to pixels when the small amount of oil products enter and leave the warehouse, the high accuracy and small relative deviation of the large amount of oil products enter and leave the warehouse. The target flowmeter calibration differential pressure transmitter is incomparable with other measurement verification methods, which is very suitable for monthly summary, inventory in the first quarter and this year.

1. The simple and convenient practice of installation and maintenance shows its key advantages:

2. The visualization of reading value is established immediately, and the supply of oil products can be read immediately;

3. It avoids the measurement and calculation of relative density.

The viscous medium solenoid valve is composed of liquid level controller and electric flow converter. The floating ball and liquid level change at the same pace, and the reed tube is operated to pull in and cut off, so that the resistance in the controller changes into a linear one, and then the converter transforms the resistor into a 4 ~ 50mA standard current data signal and accumulates the analog signal output. It can display information, alarm and control the material level in the open mouth, closed vessel or underground tank in the instrument panel control room. The tested substances can be conductive and non-conductive liquids such as water, oil, acid, alkali and industrial waste water, and overcome the harm caused by the liquid level caused by liquid foam plastics. It is widely used in oil refineries, chemical plants, paper industry, food industry, wastewater treatment and other manufacturing industries. The floating ball liquid level control board outputs 4 ~ 50mA standard current data signal and III type electric instrument panel supporting facilities, which can maintain the automatic identification, operation and recording of liquid level. The intelligent transmitter is suitable for oil refinery, chemical plant, paper industry, food industry, pharmaceutical industry and other manufacturing industries. It can also be used for waste water treatment and measurement of material liquid level in various open or pressure relief vessels The liquid level measurement of underground storage tank and high-rise residential water storage tank is especially ideal. The intelligent liquid level transmitter is made of stainless steel plate or anti-corrosion coating, and has the safety protection characteristics of explosion-proof.