About two ball float liquid level gauge and practical verification method of research and discussion

In this paper, starting from the measuring principle and classification of the level gauge, liquid level is discussed type and interface type ball float liquid level gauge calibration method and the matters needing attention. Expounds the type liquid level gauge and correction of the measured medium density difference and do test with water medium when the density of water and the correction of the measured medium density difference. A, the meaning of the level gauge verification work of liquid in the production of raw materials and finished goods level measurement for industrial production, is an important production control data. In each involves field of liquid industrial raw material, we can see a lot of liquid level meter and interface meter in use. All these level measurement and control system, we are collectively referred to as the level here. To maintain production process control system is used in the security of emergency shut off system, plays a very important role. In production to make liquid level gauge is always in a stable operation state, to guarantee the stability of production, this is the foundation of the enterprise output products for life, is also a important factor which will guarantee the safety of production. Therefore, the level of calibration and routine maintenance work is particularly important. Only guarantee the level gauge of accurate and reliable to ensure the use and play its important role in engineering. Second, the principle of buoyancy type level gauge and types based on the Archimedes law, when an object in the liquid, the liquid on it has an upward buoyant. The size of buoyancy is equal to the weight of the object displaces the liquid, the buoyancy type level gauge working principle is based on this. According to the working principle of the classification of liquid level meter can be divided into: direct reading type ( Glass tube, magnetic level gauge turning) , the buoyancy type ( Ball float liquid level gauge) , the static pressure type ( Single flange level transmitter, etc. ) , electromagnetic, ultrasonic and radiant. Buoyancy type level gauge is divided into constant buoyancy type level gauge ( Such as ball float liquid level gauge) And variable buoyancy type level gauge. In this paper is used in the oil industry more constant buoyancy type level gauge verification method. In industrial production, often need to measure container of solid material level, liquid level and two don't mix material separating interface position, we call this collectively known as material level measurement. Corresponding the solid material level measurement instrument called material level meter, liquid level measurement of liquid level meter said type level gauge, measuring interface instrument according to the position of interface type level gauge. Three, 1 type liquid level gauge calibration method. The installation of liquidometer requirements 1. 1 level gauge data parameters to verify the level before the installation must match the data table ( The design requirements) To verify the parameters. The main projects include: a number, range, accuracy grade, density of the measured medium, output signal types ( Mostly for 4 ~ 20 ma output in oil industry, this article only to output signal as an example) And the temperature and pressure measured medium, etc. 1. Zero 2 sensors confirm the gauge range determination of the oil industry is at the bottom of the tank as a benchmark to determine, such as 200 ~ 1200 mm. 200 mm here refers to the level of the flange outer tube connected to the tank ( Hereinafter referred to as the flange, outside the level gauge tube connected to the tank on the flange of the flanges) Horizontal center line of the distance from the tank bottom. When we will ywyb fqywj / 2014/0830/122. HTML is installed at the bottom of the tank must check whether the sensor zero distance 200 mm, the zero should be at the same level with the flange center. This is very important. 1. 3 transducer determine the measuring range of transmitter of interior parameters of the measuring range is value. Transducer measurement range of the lower limit is commonly 0 mm, up to the level of the distance between upper and lower flange. Such as the level range is 200 ~ 1200 mm, the transmitter measuring range should be set lower limit for LRV Omm, ceiling URV is 1000 mm. Here everyone measuring range of transmitter should be paid attention to and the level range is not a concept. Such as transmitter with liquid crystal display, when the liquid level reached the flange, how can we make the liquid crystal display is 200 mm output is 4 ma? Most manufacturers in the menu have this function, to K— TEK production of liquid level meter, for example, the menu is the setting of the deviation of the liquid level meter, we can see this value to 200. If only two before the decimal point, then we can change unit to cm, change the liquidometer offset to 20, and then change unit to mm.

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