Small method for detecting faults by gas chromatography
Gas chromatography is widely used in petrochemical, biochemical, medical and health, food industry, environmental protection, etc. In addition to quantitative and qualitative analysis, it can also determine the partition coefficient, activity coefficient and molecular weight of the sample on the stationary phase. And physicochemical constants such as specific surface area. The following is a small method for detecting faults in the gas chromatograph by Shanghai Tate Instruments.
Gas chromatographs have different faults, large or small, and there are more than one way to detect faults:
1. Observation method
This method mainly finds faults through visual observation, which we collectively refer to as observation methods. The observation method is mainly used to check the deterioration of the gas chromatograph parts, the board leakage welding, the virtual welding, the short-circuit burning between the wires, the wire breakage and the component welding errors.
2, dynamic observation method
A method of finding faults and troubleshooting by observing associated waveforms is called dynamic observation.
3, static measurement method
This is mainly to determine the fault by measuring the DC operating voltage and current in the line through a multimeter. This is a common method of troubleshooting, which is especially important for testing linear circuits.
4, the division method
In the process of finding faults, the method of stepping down the fault by gradually unplugging part of the board or disconnecting on the board, and finally isolating the fault point is called the split method.
5, tracking method
In the process of finding faults, a clue is found, and the method of tracking down the clues is called tracking method.
6, touch method
Through the touch method (ie, the finger or other parts of the person to touch the components), to find out whether the gas chromatograph components are overheated or should be hot and not hot (such as power transformers and tubes should have heat), The method of indirectly determining the fault location is called the touch method.
7, replacement method
The method of determining the fault in a certain range by replacing the electric wires, boards, tubes or other components is called the replacement method.
8, simulation method
In the process of searching for faults, the method of determining the fault by comparing the obtained data with the same point of the faultless instrument and the faulty instrument is called a simulation method.
9, heuristics
In the process of searching for faults, if measured and analyzed, several reasons can cause such faults. At this time, you can first try to use a method to troubleshoot, such as invalid, and then use another method to test To troubleshoot, this is called heuristics.
10, local heating method
The instrument malfunctions due to an increase in temperature and is usually excluded by local heating. For example, an instrument that does not work properly at a temperature of 40 ° C, and can work normally after the temperature is lowered. At this point, the instrument can be restored to normal temperature, and it is locally heated by an electric hair dryer or an electric soldering iron to find the fault. This is called local heating.
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