8 fault detection methods of magnetic flap liquid level gauge

As a liquid level measuring instrument with intuitive observation, simple structure and convenient maintenance, the magnetic flap liquid level gauge summarizes 8 methods for its common faults to find the cause of the fault. 1. The tapping hand pressure method often encounters the operation of the instrument. The phenomenon of good and bad, most of this phenomenon is caused by poor contact or virtual welding. In this case, tapping and hand pressing can be used. The so-called 'knocking' is to gently tap the plug-in board or components of the magnetic flap level gauge through a small rubber cockroach or other tapping objects to see if it will cause errors or downtime. The so-called 'hand pressure' means that when a fault occurs, after turning off the power, press the plugged parts, plugs and sockets firmly by hand again, and then start the machine again to try whether the fault will be eliminated. If you find that tapping on the case is normal, and hitting again is not normal, it is best to re-insert all the connectors firmly and try again. 2. The observation method uses sight, smell and touch. Sometimes, damaged components will discolor, blister or have burnt spots; burnt components will produce some special odor; short-circuited chips will become hot; magnetic flap level gauges can also be observed with the naked eye Welding or desoldering. 3. Elimination method The so-called elimination method is a method of judging the cause of the fault by plugging in some plug-in boards and devices in the machine. When the instrument returns to normal after a plug-in board or device is removed, it means that the fault occurs there. 4. The replacement method requires two magnetic flap level gauges of the same model or enough spare parts. Replace a good spare with the same component on the faulty machine to see if the fault is eliminated. 5. The comparison method requires two instruments of the same model, and one of them is in normal operation. Using this method also requires the necessary equipment, such as a multimeter, oscilloscope, etc. According to the nature of comparison, there are voltage comparison, waveform comparison, static impedance comparison, output result comparison, current comparison and so on. The specific method is: let the faulty magnetic flap level gauge and the normal instrument run under the same conditions, and then detect the signals of some points and then compare the two sets of signals measured. If there is a difference, it can be concluded that the fault is here. This method requires the maintenance personnel to have considerable knowledge and skills. 6. Heating and cooling method Sometimes, the instrument will work for a long time, or when the temperature of the working environment is high in summer, it will malfunction. The shutdown and inspection are normal, and it will be normal after stopping for a period of time and then restarting. After a while, the failure will occur. This phenomenon is due to the poor performance of individual ICs or components, and the high temperature characteristic parameters do not meet the index requirements. In order to find out the cause of the failure, the heating and cooling method can be used. The so-called cooling is to use cotton fiber to wipe the anhydrous alcohol on the part that may fail to cool down when the failure occurs, and observe whether the failure is eliminated. The so-called temperature rise is to artificially raise the ambient temperature. For example, use an electric soldering iron to approach the suspicious part (be careful not to raise the temperature too high to damage the normal device) to see if the fault occurs. 7. Riding shoulder method Riding shoulder method is also called parallel method. Put a good IC chip on the chip to be checked, or connect good components (resistor capacitors, diodes, transistors, etc.) in parallel with the components to be checked, and maintain good contact. If the fault comes from the internal open circuit of the device or Reasons such as poor contact can be ruled out by this method. 8. Capacitor bypass method When a certain circuit produces a strange phenomenon, such as when the display is chaotic, the capacitor bypass method can be used to determine the part of the circuit that is likely to fail. Connect the capacitor across the power supply and ground of the IC; connect the transistor circuit across the base input or collector output to observe the effect on the fault phenomenon. If the failure phenomenon disappears when the capacitor bypass input terminal is invalid and its output terminal is bypassed, it is determined that the fault occurs in this stage of the circuit.

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