In the actual inspection work, due to changes in the environment, changes in time and space, human habits often affect the accuracy of the instrument analysis. The measurement data of the instrumental analysis must be made more accurate. The Nanjing Kirin Scientific Instrument Group's testing center fully proved through a large number of comparison tests that this method can improve the accuracy of instrument analysis. The direct reading spectrum analyzer has obvious advantages in direct reading spectrometer analysis, not only fast, short analysis cycle, stability and accuracy are better than the traditional analysis methods, in the current situation of rapid social development, instrument analysis has long been replaced The traditional analysis method, photoelectric direct reading spectrum analyzer has an important position in the current industrial production.

Effects of Direct Reading Spectrometer Measurement Steps and Mode Selection on Instrumental Analysis Accuracy

1. Use environment: The laboratory where the spectrometer is placed should be shockproof, clean, and ventilated (such as the environmental requirements of the QL-5800A direct-reading spectrometer manufactured by Nanjing Unicorn: temperature is between 23 plus and minus 5, and moderately between 15 and 70%. Between), in general, direct reading spectrometer should be less than 80% of the relative fitness, indoor temperature should be maintained between 0-50 degrees, in the same calibration cycle, the indoor temperature change does not exceed 5 degrees Celsius.

2. On-site power supply voltage requirements: The power supply voltage of the QL-5800A direct-reading optical spectrum analyzer must be 220V, do not use 380V voltage, because the HX-750 type is just over-current protection, there is no overvoltage protection, and the voltage 220V change is less than 10%, frequency 50HZ, change less than 2%, and must be well grounded.

3. Check whether the argon cylinder has argon and it must be high-purity argon with a purity of 99.99% or more. The purity and flow rate of argon have a great influence on the analytical measurement value. Check whether the argon gas is correctly linked with the host and the pressure gauge. Open the argon valve and check if the argon pressure is above 10 bar.

4. After starting up, check whether the conditions such as pressure and temperature meet the requirements for normal use of the instrument. The general host pressure is displayed between 5-5.5 and the temperature is between 38 plus and minus 1, and everything can be started when everything is normal.

5, after the boot to measured time can be about 10 minutes or so, in the waiting process can be first polished pattern, sample grinding is also very important for the measurement, such as polishing the rules measured carbon content is low, such as grinding Coarse, the measured carbon content is high. After grinding the sample, it is best to use 40# sand for fine grinding. The same point can not be stimulated twice, otherwise the results will be biased. The surface of the sample has clear lines, no shrinkage holes, and no sand holes can be measured and analyzed. The surface of the polished sample can not be touched by hands. This is a common error in human error, and must be operated strictly according to the safe operation procedures.

6. Select the mode, according to the different materials of the measured sample, and adopt the corresponding mode, the mode of low alloy steel, chrome steel, chromium nickel steel is not the same, should choose the mode suitable for the material, this is also very important It directly reads the key to the accuracy of spectrometer measurement. Simply put, direct reading analysis is a qualitative and quantitative analysis, so it is more accurate than other qualitative semi-quantitative or quantitative analysis. This is the core of this article—in the instrument analysis, direct reading. The accuracy of the spectrometer is better.

7. Check whether the electrode and the excitation device are clean. Use the electrode brush to clean the electrode and the excitation device. Passivation of the electronic surface is required to be replaced, and then use a professional electrode installation tool to fix it in the correct position (general electrode tip to the analysis surface distance 4mm) .

8. Dilute sample with waste, until the point of production meets the requirement of 3-6 mm metallic luster point, measure with a standard sample close to the sample to be measured, and if the deviation between the measured value of the standard sample and the standard value is small, measurement can be performed. If the deviation is large or unstable, OPS should be performed on this standard. If the OPS result is still not satisfactory, you need to re-create the curve and know that the problem is solved.

Effects of Direct Reading Spectrometer Standard Samples and Standardization on Instrument Accuracy

1, personnel training. The detection accuracy has a very important relationship with the operator's habits. The inspected personnel must undergo professional training and master the operation method before they can operate on the machine. The inspectors must have corresponding qualification certificates and be familiar with the allowable error range of national standards and national standards.

2. Electrodes, adapters, rubber rings, etc. are consumables. To do regular inspections and find that they are not replaced immediately, the daily maintenance of the instrument is also very important. It directly affects the accuracy of the instrument analysis. This is to ensure the accuracy of the instrument analysis. An important link.

3. After each measurement is finished, be sure to check carefully whether the combustion point is normal. If it is found that the diffusion discharge needs to be retested.

4. Take a rest for every 20 measurements or more. When the device is measured in a high temperature environment, the device will be damaged due to the increased number of rests. The device will damage the instrument at a high temperature, affecting the measurement result. Note that the interval between switching on and off should be 5 Minutes or more.

5, grinding the sample of different substrates should be replaced sandpaper, try to avoid the matrix time pollution, when making curves should also pay attention.

6、Exhaust gas discharge pipelines need to be regularly cleaned. Cleaning methods: Debugging argon gas flow to the maximum, preventing the waste gas from entering the argon gas pipeline to form pollution when cleaning the pipeline, taking off the rubber hose, exhausting the exhaust gas, and paying attention to the application of silicon when installing the rubber hose. Closed.

Nanjing Kirin Scientific Instrument Group Co., Ltd.

Testing Center

August 23, 2017

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