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Method for preparing an infrared oil analyzer: Preparation of a single reference oil. At a room temperature of around 20°C, 1.000 gram each of n-hexadecane pure substance, cetyl alcohol pure substance, and toluene pure substance was weighed, placed in 100 mL volumetric flasks, and the volumes were adjusted to the mark using carbon tetrachloride; thus, the concentration of each substance was 10.0 grams per liter. When in use, dilute to 1.00 g/L of n-hexadecane, 1.00 g/L of cetylalkane, and 1.00 g/L of toluene. It is then diluted to 40 mg/L of hexadecane, 40 mg/L of cetylalkane, and 100 mg/L of toluene. Preparation of blended reference oil. Take 5 mL of hexadecane stock solution, 3 mL of cetyl alcohol stock solution, and 1 mL of toluene stock solution, mix them together and stir well. Next, 1.000 grams of this mixed stock solution was weighed and placed in a 100 mL volumetric flask, where it was diluted to the mark with carbon tetrachloride, resulting in a concentration of 10.0 grams per liter. Before use, it was diluted to 1.00 g/L, and then further diluted to 64 mg/L. The standard solution should be used on the day it is prepared. Precautions for infrared spectroscopic oil analyzers: 1) The oil content in the sample should be below 80 ppm to ensure higher data accuracy; 2) Since water can severely interfere with the testing of samples, it is essential to carry out dehydration treatment during the sample extraction and preparation process (anhydrous sodium sulfate is generally used for this purpose). 3) When the scan curve is a horizontal line during testing and no characteristic peaks appear, one possibility is that a horizontal line appears at the bottom, which is due to residual water in the sample; another possibility is that a horizontal line appears at the top, indicating that the concentration of the sample is too high and exceeds the measurement range, requiring dilution before measurement. 4) If the intervals between test samples are long, try not to always use a blank value. 5) All parameters of the instrument have been adjusted; do not change them arbitrarily.