Case analysis and characteristic application of submersible liquid level gauge

Submersible liquid level gauges have a variety of options for accuracy ranging from 0.25% FSO to 0.05% FSO. Most of the submersible liquid level gauges can realize the temperature signal output of the medium at the same time by adding a PT100 temperature sensor. The high-temperature submersible liquid level gauge LMK458 can measure media up to 125°C. Atmospheric ducts minimize the effects of condensation problems through a triple filter system. There are many types of materials for the shell, cable jacket, and liquid-wetted sealing ring of the product to meet the different requirements of customers for corrosion resistance. The basic working principle of the drop-in liquid level gauge is static pressure liquid level measurement. In the liquid medium, the pressure generated at a certain depth is generated by the weight of the medium above the measurement point. It is proportional to the density of the medium and the local gravitational acceleration. The proportional relationship between them is reflected by the formula P=ρGH. Where P=pressure, ρ=medium density, G=gravitational acceleration, H=depth of measuring point. Therefore, the physical quantity measured by the submersible level gauge is actually pressure, which can be understood through the calibration unit MH2O of the submersible level gauge. The actual liquid level must be obtained through conversion after knowing the two parameters of density and acceleration of gravity. Such conversion is usually performed by secondary instruments or PLC in the industrial field. The advantages of the submersible liquid level gauge: high measurement accuracy; easy installation; the signal can be remotely transmitted and controlled; it can resist the corrosion of various media by choosing different materials; it is suitable for explosion-proof occasions; the price is moderate. The disadvantages are as follows: the measurement signal needs to be converted; the temperature of the high-temperature medium exceeding 125°C cannot be measured; the density of the measurement medium must be uniform. The following editor has sorted out some cases, from which we can see how to better use the submersible level gauge. Case 1 In a power station expansion project, 42 sets of LMK457 series products of the input liquid level gauge are used in the seawater cooling water circulation filtration system of 4 reactors. Specific application: Seawater circulation is to ensure the flow rate and flow direction of the seawater condensation cycle in the circulation system by controlling the water level difference between the upstream and downstream of the gate. The role of LMK457 is to ensure that the water level difference between upstream and downstream is always kept within the specified range. And the signal provided by the input liquid level gauge controls the opening and closing position of the gate. Case 2 Tanker ballast tank liquid level measurement: In a tanker with a total of 64 tanks, the liquid level gauge LMK457 is used to measure 17 ballast tanks, 4 fresh water tanks, and 22 oil tanks/fuel tanks in a drop-in or side-mounted manner , 11 engine oil tanks, 2 gray water tanks, 2 slop tanks, various liquid media stored in 2 reserve tanks, and 4 draft depth measurements. The range adopted is unified as 20MH2O. The liquid level gauge used for seawater medium measurement in the ballast tank adopts CUNIFE alloy shell to resist seawater corrosion. The draft sensor LMK457 adopts a side-mounted method and is connected to the bottom wall of the ship through a ball valve to monitor the draft shape of the hull. Case 3 The groundwater level monitoring system designed by the Earthquake Monitoring Bureau of a certain province uses 6 sets of input LMP307 with a range of 50-60MH2O to monitor groundwater level changes in real time at several observation points in the province. After the steel pipe is driven into the ground to a certain depth, a drop-in liquid level gauge is installed in the steel pipe. Detect the fluctuation of water level through the output signal, and look for signs of abnormal fluctuations in the groundwater level that may occur before the earthquake. Case 4 A sewage treatment plant of an iron and steel group provided an input liquid level gauge LMK809 with a 5MH2O range equipped with a PVC shell and FEP cable to monitor the liquid level of the sewage storage tank containing a large amount of acidic solution that needs to be purified. At the same time, there are a lot of iron filings floating in the medium. When installing, do not put the liquid level gauge into the bottom of the tank, but suspend it at a position about 1M away from the bottom of the tank, and clean it regularly. Ensure that the probe is not buried in the dirt at the bottom of the tank, and keep the probe diaphragm clean. Case 5 The ship lock of the Yangtze River channel dam uses an input liquid level meter LMP308I to monitor the upstream and downstream liquid levels of the gate to ensure the safety and stability of ships passing through the gate. Specific application: install a set of drop-in liquid level gauges inside and outside the gate, adjust the opening position of the gate according to the speed of the liquid level change inside and outside, until the upstream and downstream water levels are the same, and after the ship passes, close the gate to store water.

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