The floating ball liquid level meter is composed of liquid level sensor and intelligent Hart board (current converter). The floating ball changes synchronously with the liquid level to control the switch on and off of the reed pipe, so that the resistance in the sensor changes linearly. Then the converter converts the resistance change into 4 ~ 20mA standard current signal and superimposes Hart digital signal for output.
Installation, use and maintenance of float level gauge
1. The liquid level gauge must be installed vertically to ensure that the floating ball assembly can move up and down freely in the main pipe.
2. * install a stop valve between the container and the liquid level meter to clean and repair the liquid level meter and cut off the material.
3. No magnet is allowed to be near the main pipe of the liquid level meter, otherwise it will directly affect the normal operation of the liquid level meter.
4. After the liquid level meter is installed, it is necessary to use magnetic steel for correction, and guide the column once, so that red is displayed below the zero position and white is displayed above the zero position.
5. When the liquid level meter is put into operation, the valve of the lower liquid leading pipe should be opened first to let the liquid medium enter the main pipe smoothly, so as to avoid the liquid medium rising rapidly with the floating ball assembly, resulting in the failure or upset of the column turnover Center (in case of this phenomenon, the magnetic steel can be used for re correction after the rise and fall of the liquid level is stable)
6. In order not to damage the floating ball assembly during transportation, take the floating ball assembly out of the main pipe of the small liquid level meter before leaving the factory. After the liquid level gauge is installed, open the bottom drain flange, and then re install the floating ball assembly into the main body pipe. Pay attention that the heavy end of the floating ball assembly is upward and cannot be inverted.
7. According to the medium condition, the blowdown flange can be opened regularly to clean the precipitates in the main pipe.
Instructions for application of float level gauge
1. A cut-off valve is installed between the side mounted liquid level and the upper and lower liquid distribution pipes of the tested container to open or assemble the liquid level meter. On the other hand, it is convenient to maintain the liquid level. When the upper and lower stop valves are closed, the drain flange at the bottom of the liquid level meter can be opened or the drain screw can be removed, and the main body of the liquid level meter can be cleaned by injecting clean water.
2. When installing the liquid level meter, the verticality of the central line of the flange is ∠ 4 ‰. When the measuring range of the liquid level meter is greater than 3m, it is necessary to consider adding the middle reinforcement flange (or lug) as the fixed support to increase the strength.
3. The cross-sectional area of the core wire for the connection between the transmitter of the matched remote liquid level meter and the secondary instrument shall be greater than 0.8mm2. When the core wire is laid in parallel with the AC power supply, the distance of at least 20cm shall be maintained. The core wire shall be laid separately through the iron pipe or with two core cable, and only one end of the layer can be grounded.
4. The liquid level controller is selected, and its contact capacity is designed with resistive load. If non resistive or high-power load is used, intermediate relay shall be used for conversion.
5. It is not suitable to use the liquid level meter when the liquid medium contains suspended impurities and magnetophile substances (because these impurities will cause jamming to the float assembly)
6. The "L1" in the outline structure diagram is the "Sinking Distance" of the side mounted liquid level gauge. The user must understand that this parameter is related to the medium density. According to the buoyancy principle, the length of the float assembly is related to the medium density. Therefore, in the selection and design, different medium has different L1.
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