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In the application of the liquid level gauge, in addition to understanding its application and inspection, we must also grasp the necessary fundamental inspection methods. The most commonly used methods in inspection are panel tightening method, direct touch method, tracing method, comparative substitution method, test discrimination method and dumb slaughter method. The following six approaches are explained.

1. Direct Touch Method Direct touch method is a method of judging the stop of direct sensation in eyes, ears, nose and hands. It is a helpful wrist that is lacking in test. All the departments, levels, roads and points can be used in the process of tightening. Occasionally it is particularly important in determining what is wrong.

2. Panel Tightening Method The method of panel tightening applies the method of holding circuit switches, knobs, jacks and buttons on the panel of float liquid level gauge to stop the faulty tightening. The method of panel tightening is a common external austerity method used to determine the faulty scene and the faulty Ministry level. However, because the panel of the liquid level gauge is not identical so completely and differently, it is the best parts to determine the faults in the construction. Therefore, it is necessary to work with other methods to determine the existence of faults completely and occasionally. So, in particular, panel tightening method is an ineffective way to help.

3. Test Discrimination Method Test discrimination is a method of identifying the number of stops of circuit data measured by instruments. It is the most commonly used fundamental method for tightening the defective roads and points. The test discrimination method can be divided into two kinds: power-on test and no-power-on test. The power-on test includes three kinds: the test of the voltage and current of the level gauge, the test of the parameters of the circuit components, and the test of the important technical indicators of the level gauge. The most commonly used is voltage and current testing. No-power-on test refers to the test of the relevant circuits, devices, components and insulation resistance of the liquid level gauge. By comparing the measured data with the deformity data, it is possible to distinguish whether the liquid level gauge has an end-to-end barrier or a fault category. For example, the data reviewed by ZO zirconia oxygen content analyzer can be compared with our electronic sample data sheet. If it does not conform to the standard, the instrument may show faults, or wiring results, etc.

4. Disturbance Tracking Method With a small screwdriver in hand, all levels of electronic devices are buckled step by step from the last stage of the liquid level gauge to the front stage. Meanwhile, the size of the action in the actuator and the presence or absence of loudspeaker sound is determining the defective parts and levels. For example, in the process of disturbance tracking, the invention knocks on a certain level of deformity. When knocking to the first level silently or soundlessly, the pole between the latter and the former is the defective part.

5.  Searching Method of Flag Lamp The method of examining the faults of the compact magnetically flipped column liquid level gauge by using the flag lamp tracer (the simplest is a detector consisting of a semiconductor diode and a headset). The method is: from the output of the flag lamp generator to the liquid level gauge to be repaired, using the flag lamp tracer from the front to monitor the flag lamp, so as to determine the fault level.

6. Flag and Signal Tracking Method Audio, intermediate frequency and high frequency signals are input to the liquid level gauge step by step from back to front by using the signal generator. At the same time, the output size from the terminal components is checked to see whether the tasks at all levels are malformed or not, and the fault grade is determined.

7. Tracing Method Tracing method is the basic method to test the high sensitivity of magnetic flip plate liquid level gauge. It includes disturbance tracing method, flag lamp tracing method and flag lamp tracing method.

8. Comparative Substitution Method The comparative substitution method is to stop comparing and replacing liquid level gauge, components, devices and components with the same example in order to distinguish the advantages and disadvantages, deformities or not. In the absence of instruments or in the case of unfamiliar liquid level gauge, it is relatively simple and easy to compare substitution magicians to distinguish between good and bad, deformity or not.

9. Dumb Slaughter Method Dumb-level slaughtering method is used to test the crying, humming and noise of liquid level gauge. Detailed methods are as follows: using capacitors or short-circuit bars with large capacity, short-circuit input circuit and output circuit of flag lamp of each level meter step by step from front to back in order to determine the defective part and grade. If the fault scenario is stable or has little influence at a certain level of short circuit, and the fault disappears at a later stage of short circuit, then the location of the fault is between the latter stage and the former stage, as well as the related circuit.
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