Explanation of the four testing steps for using an acid value tester

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Explanation of the four testing steps for using an acid value tester: 1. Place the neutralizing solution in the neutralizing solution bottle. Place about 20 g of KOH in a gas washing bottle, add 200 ml of distilled water, stir well, and after it cools down, close the bottle lid. Put the neutralizing solution into a small bottle – approximately 40-60 ml; don’t use too much as this may cause the solution to lose its effectiveness. Make sure to close the bottle tightly ； 　　2. Adjustment of the neutralizing solution pump: Press the reset button to start the neutralizing solution pump; observe the dropper needle of the neutralizing solution – the titration test should proceed at a rate of one drop per second ； 　　3. Adjustment of the stirring force: The optimal setting for stirring is to have a vortex distance of 15 mm from the bottom of the cup. The speed should not be too fast nor too slow; it can be adjusted using the stirring knob on the instrument’s chassis – turning it clockwise increases the speed, while turning it counter-clockwise reduces it ； 　　4. Insert the stirring magnet, then place the test cups on the instrument’s testing tray, aligning them one by one.