Key Points for Operating Transformer Oil Acid Value Analyzers: Standard Procedures Ensure Accurate Testing; Goldhome's Fully Automated Solutions Enable Efficient Operations and Maintenance
In power systems, the concentration of acidic substances in transformer oil directly reflects the degree of oxidative degradation of the oil and serves as a key indicator for assessing the risk of internal corrosion and determining the equipment's service life. As an analytical instrument specifically designed to accurately measure the concentration of acidic substances in insulating oil, the proper operation of an acid number tester is crucial for ensuring the safe and stable operation of power equipment. With the advancement of automation technology, fully automatic acid number testers have completely replaced traditional manual operations, significantly improving testing efficiency and result accuracy.
Standard Operating Procedure for Fully Automatic Acid Number Testers
Step 1: Preliminary Preparation and Instrument Inspection. Place the instrument steadily on the test bench, check that the power supply is properly connected, and confirm that the ambient temperature is between 5°C and 40°C, with relative humidity not exceeding 85%. Check that the tubing is unobstructed and ensure that the neutralizing solution and extraction solution reagent bottles are tightly sealed to prevent solvent evaporation or interference from carbon dioxide in the air. Turn on the instrument and let it warm up for 10 to 15 minutes to ensure it reaches a stable operating state.
Step 2: Blank Test and Parameter Setup. If the extraction solution or neutralizing solution has been changed, a blank test must be performed first. Place an empty cup in the sample position, insert a stirring bar, set the sample type to "Blank," and press the "Start" button to allow the instrument to automatically complete the blank titration. Then, set parameters such as the sample number and titration mode (typically "Automatic Titration") on the operating interface, and enter the concentration value of the neutralizing solution.
Step 3: Sample Weighing and Placement. Use a syringe to accurately draw the oil sample: 8 mL for transformer oil and turbine oil, and 1 mL for fire-resistant oil. Weigh the net sample mass and record the cup number. Pour the oil sample into a clean, dry sample cup (the cup must be thoroughly cleaned with anhydrous ethanol and dried), place a stirring magnetic bar inside, and place the cup in the corresponding position on the sample tray. Touch the sample mass corresponding to the selected test cup with your finger and enter the sample mass value.
Step 4: Start Automatic Measurement. Press the "Start" button; the instrument will automatically perform the entire process of liquid addition, stirring, titration, and endpoint detection. The instrument is based on a single-chip microcomputer and employs the neutralization method principle to automatically complete the addition of the extract, neutralization titration, and endpoint detection at room temperature. The entire measurement process requires no manual intervention. The measurement time for a single sample is approximately 2 minutes, and the instrument supports continuous measurement of 1 to 6 samples.
Step 5: Result Processing and Cleanup. The screen displays the test results immediately after each oil sample is analyzed. Once all oil samples have been measured, the instrument automatically prints the results. After testing is complete, turn off the power, remove the sample cups, and clean the titration head and stirring paddle with ethanol. Dispose of waste liquid according to laboratory regulations to prepare for the next test.
Operational Precautions
Wear protective gloves during operation to avoid skin contact with organic solvents and alkaline solutions. Test cups must be thoroughly cleaned with anhydrous ethanol and allowed to dry before use. Always perform a blank test before beginning the analysis. If there has been a long interval between tests or if the ambient temperature has changed, a new blank test must be performed before each analysis. During the blank test, do not add the neutralizing solution too quickly, as this may result in inaccurate drop counting and affect the experimental results. When placing the oil sample cups on the tray, ensure that the bottom of each cup is positioned within the cup holder on the tray to prevent misalignment that could affect the photometric detection.
