Eight common methods for fault detection of magnetic turnover liquid level meter

As a kind of intuitive observation, simple structure, easy maintenance of liquid level measuring instrument, in the tank area has been a large number of applications, for its common failures, our technical staff summarized the very practical value of 8 methods, according to these methods, we can basically find and find the cause of the failure, these 8 methods are listed as follows:

1, tapping hand pressing method

Often encounter the phenomenon of good or bad operation of the instrument, which is mostly caused by poor contact or virtual welding. In this case, tapping and hand pressing can be used.

The so-called "tapping" is to gently tap the connector board or components of the magnetic turnover level meter through the small rubber d ¨± head or other tapping objects to see whether it will cause errors or stop The so-called "hand pressure" is that when the fault occurs, after turning off the power, the inserted parts and plugs and seats are re-pressed by hand, and then the machine is turned on to try whether it will eliminate the fault. If it is found that tapping the casing is normal, and then tapping is not normal, it is best to reinstall all joints and try again.

2. Method of observation

Use sight, smell and touch. In some cases, damaged components may become discolored, blistered, or charred; Burned-out devices produce some peculiar odors; Short-circuited chips get hot; With the naked eye, you can also observe the virtual welding or welding of the magnetic turnover level meter.

3. Elimination method

The so-called elimination method is a method to determine the cause of the fault by some plug-in boards and devices in the plug-in machine. When the meter returns to normal after removing a board or device, it indicates that the fault occurred there.

4. Substitution method

Two magnetic turnover level gauges of the same model are required or sufficient spare parts are available. Replace a good spare with the same component on the faulty machine to see if the fault is eliminated.

5. Contrast method

It is required to have two instruments of the same model, and one is in normal operation. The use of this method also has the necessary equipment, such as multimeters, oscilloscopes, 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 turnover level meter and the normal instrument operate under the same circumstances, and then detect the signals of some points and compare the two groups of signals measured, if there is a difference, you can determine that the fault is here. This method requires the maintenance personnel to have considerable knowledge and skills.

6, rising and cooling method

Sometimes, the instrument works for a long time, or when the working environment temperature is high in the summer, there will be a fault, the shutdown check is normal, the stop for a period of time and then the boot is normal, and the fault occurs again after a while. This phenomenon is due to the poor performance of individual IC or components, and the high temperature characteristic parameters do not meet the requirements of the index. In order to find out the cause of the failure, the method of rising and cooling can be used.

The so-called cooling is that when the fault occurs, the anhydrous alcohol is wiped with cotton fiber in the possible fault part to cool it down and observe whether the fault is eliminated. The so-called heating is to artificially increase the ambient temperature, such as using a soldering iron to put close to the suspected part (pay attention to the temperature must not rise too high to damage the normal device) to see whether the fault occurs.

7, riding the shoulder method

The riding shoulder method is also called the parallel method. Put a good IC chip on the chip to be checked, or put the good components (resistance capacitor, diode, transistor, etc.) in parallel with the components to be checked, maintain good contact, if the fault comes from the device internal open circuit or poor contact and other reasons, then this method can be eliminated.

8, capacitor bypass method

When a circuit produces a relatively strange phenomenon, such as display confusion, capacitive bypass method can be used to determine the likely fault part of the circuit. The capacitor is connected to the power supply and ground end of the IC; The transistor circuit is connected at the base input or the collector output, and the effect on the fault phenomenon is observed. If the capacitor bypass input is invalid and the fault disappears when it bypasses its output, the fault is determined to have occurred in this level of the circuit.

Fuspen's magnetic turnover level meter is made of seamless polishing tube, most of the market use a stitched polishing tube, compared to seamless polishing tube with better sealing and pressure resistance. Fuspeng magnetic flap level meter flange adopts the national standard flange thickness of the Ministry of Chemical Industry, thicker, more stable and stronger! The float is made of 316L material, which is more durable.

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