The inspection and maintenance of the float level gauge must be in place

There are many problems with float level gauges. If you are not paying attention, it may cause major problems in your work, so we must check and maintain in place in our daily work, so that the equipment can operate safelyFloat level gauge problemThe editor introduced the working principle and structure of the float level gauge. When diagnosing the fault of the float level gauge, it is necessary to combine this knowledge with the fault phenomenon to quickly find the fault point and deal with it. Huikeda instrument is mainly responsible for the inspection and maintenance of the float, connecting rod and conversion mechanism of the float level gauge. The main faults of the float level gauge are zero drift and inaccuracy of the full scale. They are mostly caused by the influence of temperature on electronic circuits or the vibration in the instrument installation environment. It can be solved by adjusting the circuit parameters and calibrating the instrument. The process level changes, but the float level gauge shows the same. Many of them are caused by vibration caused by loosening or loosening of fastening bolts. The connecting shaft is loose, which separates the transmitter from the float shaft. The liquid level of the float level gauge is slow, which may be caused by damage to the bearing and excessive friction. Sealing packing aging and leakage are also common faults1. Overhaul of floating ball. They cannot be maintained during production. Only when the process is stopped, their condition and malfunction can be observed. Therefore, check carefully during maintenance. The mechanical structure of the float will directly affect the operation of the device. During the production process, the float ball in the tower tank fell off, the float ball corroded and failed, the float ball component in the tower tank had problems, and the instrument was very passiveA floating ball is a hollow ball that welds two hemispheres together. The floating ball has a thin wall and is easily perforated and worn by the corrosion of the medium. The welding part of the two hemispheres is easy to corrode, so special attention should be paid to inspection. The floating ball and the connecting rod are connected by bolts. In order to prevent the floating ball mechanical parts from falling off and loosening during use, all mechanical fasteners such as bolts, threaded connections, fixing nuts, etc. should be spot welded after being tightened.2. Inspection and maintenance of connecting rodThe floating ball connecting rod has a long length and is prone to deformation and bending under the action of high temperature, corrosion and liquid fluctuations. Thereby changing the measuring range of the floating ball and increasing the dead zone. At the same time, there will also be hidden dangers of bending and fracture of the connecting rod. If the connecting rod is found to be bent and deformed during the maintenance process, it should be corrected or reinforced, or even replaced. Replace the floating ball connecting rod tightening nut when it is severely corroded3. Inspection and maintenance of the conversion mechanism3. The wide-range float level gauge has a complicated mechanical structure, many parts, and many inspection parts; the moving parts or fixed parts of the transmission mechanism are easily corroded in the medium, such as the corrosion of the movable limit hole becomes larger, and the corrosion of the limit bolt becomes thinner and smaller During maintenance, check the corrosion degree of the stop bolt and the solid nut of the rocker arm. Check the conversion mechanism, bushings and bolts in detail. Replace and repair severely corroded partsFloat level gauge problemDue to the corrosion of the floating ball displacement converter, the gap between the ball rod and the main shaft will become larger, which will produce a larger dead zone, resulting in a larger measurement error of the float level gauge, but as long as the gap is eliminated, the dead zone will be eliminated . The end of the cue can be welded to the recess of the main shaft; it can also be threaded on the end of the floating cue to lengthen the thread connecting the cue and the guard sleeve. Drill and tap the thread in the recess of the main shaft to make the end of the cue Part and spindle become threaded connection4. Assembly points, adjustment and maintenance of float level gauge. Assembly work after repair is still very important. The float is very important for the installation of the weight rod, the float displacement transmitter and the connecting plate. When installing, pay attention to the concentricity of the float angular displacement sensor and the float shaft to meet the requirements, only in this way can the friction of the shaft be small and the service life is long.The removed float level gauge must be installed on the equipment and can be used after the adjustment is qualified. Usually adjust the transmitter first, and then fix the plate so that the angle of the transmitter is close to the zero position. Tighten the fixing plate bolts, fine-tune the zero point and range of the transmitter, lift the balance bar by hand to make it at the highest position, turn the transmitter zero adjustment knob to output current 4mA; then press the balance bar by hand to make it at the lowest position, and turn The transmitter range knob makes the output current 20mA. When adjusting, connect a digital multimeter in series with the measuring circuit to read the current value, which is more accurate than the meter reading of the transmitterDaily maintenance should pay attention to the lubrication of the transmitter bearing, and regularly check the looseness of the fastening bolts, whether the floating ball spindle packing nut is tight, whether the packing is leaking or lacking, and whether the spindle is locked. The tightness of the main shaft packing nut will affect the measurement error of the float level gauge. The level measurement is not accurate. In addition to the zero drift of the transmitter, it may be caused by improper adjustment of the float weight. To judge whether the adjustment of the float weight is appropriate, you can lift the balance bar with your hand and then release it. The balance bar should be able to return to the initial position, press down the balance bar by hand and then loosen it. If the balance bar can return to the initial position, the torque is appropriateThere are many problems with float level gauges, so you must pay attention to the inspection and maintenance of the machine, and make preparations so that your production will not have major problems and your work can be completed normally.