Online density meter daily knowledge and water seepage prevention

One working principle The online density meter (also known as the online density transmitter) is a device used for continuous online measurement of the concentration and density of liquids. The online density meter can perform online density measurement of various liquids or liquid mixtures. The density meter uses technology including: a capacitive differential pressure sensor and a pair of pressure repeaters connected to it that are inserted into the production process. There is a temperature sensor between the two pressure repeaters to compensate for temperature changes in the process liquid. The online density meter is a two-wire density transmitter, which is mainly used for industrial process control. It generates a corresponding 4-20mA signal according to the concentration and density, and can be remotely calibrated and monitored through digital communication. 2. Features of online density meter 1. Online density meter is suitable for flowing or static liquid, suitable for pipeline and tank installation. 2. The two-wire transmitter with integrated structure has no moving parts and is easy to maintain. 3. Continuous online measurement of liquid density and temperature without process interruption. It can be directly used for production process control. 4. Dual four-digit LCD display. 5. The two parameters of temperature and density can be displayed at the same time, which is convenient for industry standard density conversion. 6. There are several different liquid contact materials for the density meter. 7. It is easy to install and use, and the reading can be displayed when the liquid is inserted. 8. Simplify maintenance without regular cleaning. 9. Online density meter calibration requires no standard reference source, no laboratory calibration, and no process interruption. Three online density meter working principle Online density meter working principle: the pressure generated by a certain height of the liquid column is proportional to the density of the liquid. Namely: Pu003dρgh In the formula: P—— the pressure generated by the liquid column of a certain height ρ—— the density of the liquid g—— the acceleration of gravity h—— the height of the liquid level Under the condition that the acceleration of gravity and the height of the liquid column are known, the density value of the liquid to be measured can be obtained. Four On-site installation of the online density meter After the online density meter is installed on site, the electrical interface needs to be wrapped with waterproof tape to prevent rainwater from entering the meter and causing a short circuit. For the meter that has entered the water, we need to test the display screen to see if it can still light up after turning on the power supply, and then test the circuit board to see if the circuit board still has a current value after passing through the water bubble. In this case, the circuit board passing through the blisters will not have a current value output. For the sensor, if the water bubbles for a long time, the rainwater will penetrate into the sensor through the sealant, resulting in no response to pressure. Under normal circumstances, the density meter will basically be scrapped after passing through the blisters. Therefore, when installing on site, it must be carried out in accordance with the relevant use standards of the product.

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