The use of instrumentation, whether it is affected by the external environment, or the factors of the instrument itself, how many small faults will occur, the failure analysis and elimination of the metal tube float flowmeter, Chengfeng Instrument listed some conditions and respectively given The solution is as follows:
First, regarding the slight jitter of the jitter, generally due to the fluctuation of the medium, the method of increasing the damping can be used to overcome; the moderate jitter is generally caused by the flow state of the medium, and the gas is generally unstable due to the unstable operation pressure of the medium. Flow device to overcome or increase instrument air damping; violent jitter, mainly due to medium pulsation, air pressure instability or pressure, temperature, flow rate of the gas operating state given by the user does not match the actual state of the instrument, there is a big difference causing the instrument to exceed Range.
Second, the main reason for the pointer to stop at a certain position is that the float is stuck. Generally, when the instrument is used, the valve is opened too fast, so that the float quickly impacts the stopper upward, causing the stopper to deform and the float to be stuck. However, it is not excluded that the float is stuck due to the difference between the float guide rod and the stop ring. When disposing, the instrument can be removed, the deformed stopper can be removed and shaped, and checked whether it is concentric with the guiding rod. If the heart is not correct, the float can be installed, and the float can be pushed by hand, and the float is smooth and unobstructed. Yes, in addition, it must be installed vertically or horizontally when the instrument is installed, and it cannot be tilted. Otherwise, it may easily cause the card table and bring errors to the measurement.
Third, the measurement error is one because the installation does not meet the requirements. The installation has the following requirements:
For vertical installation of the instrument to maintain vertical, the inclination angle is not more than 2 °; for horizontal installation of the instrument to maintain horizontal, the inclination angle is not more than 2 °; 100mm space around the instrument must not have ferromagnetic objects; installation location should be away from the valve reducer, pump outlet, Process pipeline turns and so on. To maintain the requirements of the 250mm straight pipe section after the first 5D.
Second, because the density of the liquid medium changes greatly, this is also a cause of large errors. Since the instrument is converted according to the density given by the user before the calibration, the flow rate of the water in the calibration state is calibrated. Therefore, if the density of the medium changes greatly, the measurement will cause a large error. The solution can bring the density of the medium after the change into the formula, convert it into the error correction coefficient, and then multiply the flow measured by the flow meter by the coefficient to replace the actual flow.
Third, the gas medium is greatly affected by temperature and pressure. It is recommended to use temperature and pressure compensation to obtain the true flow rate.
Fourth, due to long-term use and pipeline vibration and other factors, the instrument sensing magnet, pointer, counterweight, rotating magnetic steel and other moving parts are loose, resulting in large errors. Solution: You can verify by hand pushing the pointer first. First press the pointer to the RP position to see if the output is 4 mA, whether the flow display is 0%, and then verify according to the scale. If the discrepancies are found, the parts can be adjusted. Generally require professional adjustment, otherwise it will cause the position to be lost, need to return to the manufacturer for correction.
Fourth, no current output First look at the wiring is correct; secondly, see if the LCD has a display, if there is no output, if the output tube is broken, the circuit board needs to be replaced; in addition, the calibration value is lost, due to the E2PROM failure, the instrument calibration Loss of data will also cause no output current and the current will remain the same. Solution: Data recovery operation can be used. If it does not work, you can set the data in password 2000 first, and then set the password in 2008. The method is to push the pointer to calibrate the data from RP - 100%.
5. No on-site display First check if the wiring is correct. Next check if the power supply is correct. Finally, reinstall the LCD module and check that the contact is not true.
Some common forms of failure and solutions are roughly the same. Chengfeng Instrument will serve the purpose of the customer with all its heart and soul, and will give others the convenience and kill the fault before it happens.
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