Multi functional gas chromatographTest different concentrations of standard gases and save spectra
　　
A．Multi functional gas chromatographChromatographic conditions: column temperature of 50 degrees; Detector at 150 degrees; Injector at 150 degrees; Column pressure 0.04Mpa; Quantitative ring 1mL;
　　
B. The multifunctional gas chromatograph is diluted with nitrogen and prepared with standard gas. After the instrument stabilizes, the sample is injected. One injection can obtain the total hydrocarbon peak and methane peak. Repeat the testing of different concentrations of standard gas and save the spectrum; Calculate the calibration curve using the external standard method;
　　
C. The sample of the multifunctional gas chromatograph contains oxygen, and the chromatogram obtained from the methane column shows that the oxygen peak and methane peak are separated, while the total hydrocarbon peak contains an aerobic peak. Therefore, when calculating the total hydrocarbon content, the oxygen peak needs to be deducted. Inject 1ml of hydrocarbon free air, and the oxygen peak that needs to be subtracted from the total hydrocarbon peak can be obtained by external standard method.
　　
D. The multi-functional gas chromatograph injects the gas sample to be tested and deducts the oxygen peak to obtain the final non methane total hydrocarbon content.
　　
Technical indicators for temperature control of multifunctional gas chromatograph:
　　
Temperature control range: room temperature+8 ℃ -420 ℃ Temperature control objects: column box, detector, thermal conductivity cell, sampler
　　
Temperature control accuracy: ± 0.1 ℃ within 200 ℃; ± 0.2 ℃ above 200 ℃
　　
Program temperature rise: fifth order linear range rise
　　
Cheng Sheng rate: 0.1-30 ℃/minute increments of 0.1 ℃