Launch of New Automatic Acid Value Tester: 2-Min Analysis for Transformer Oil

Wuhan, June 12,2026 — As power systems demand higher precision in equipment maintenance, oil quality testing for oil-filled electrical equipment has become a critical component in ensuring grid safety. Recently, a new fully automated oil acid value analyzer, featuring high-precision digital control technology and user-friendly design, is gradually replacing traditional manual methods, offering a groundbreaking solution for acid value analysis of transformer oil and steam turbine oil.

This instrument centers on a single-chip microcomputer and integrates optical, mechanical, electrical, and chemical analysis technologies, significantly enhancing detection efficiency while addressing critical limitations of traditional methods such as the health hazards posed by chemical reagents and substantial human-induced errors.

This instrument employs the neutralization method principle, combined with self-developed background blank subtraction and titration endpoint logic determination algorithms, ensuring high precision and accuracy in measurements. Its key performance parameters are listed in the following table:

This instrument achieves a fully automated process encompassing liquid addition, stirring, titration, and endpoint determination. Operators are exempt from direct contact with organic solvents, significantly reducing the health risks posed by chemical substances. The standard testing procedure is as follows:

1. Preparation steps: On the startup screen, click "Initialize", set the cup numbers for sample testing (1–3 samples are available), and configure the time settings.
2. Reagent venting: Perform "extraction venting" and "neutralization venting" sequentially until no visible bubbles remain in the pipeline.
3. Sample injection: Accurately add 10.0 mL of the test oil sample into a clean sample oil cup and insert the stirring magnet rod.
4. Start the test: Cover the oil sample testing chamber with its lid and press the "Start" button. The screen will display real-time statuses such as "Test in Cup X" and "Titration in Progress".
5. After completion of the measurement, the instrument automatically displays the titration endpoint (EP) value and saves the data. The instrument can store up to 35 sets of data and supports retrieval and printing.

This instrument is specifically developed for routine inspection of oil-filled electrical equipment in power systems and industrial/mining enterprises, and is primarily used in the following applications:

• Power substation: Used to measure the acid value of transformer oil during operation and assess the degree of insulation oil aging.
• Power plant: Monitor the acid content in steam turbine oil to prevent equipment corrosion.
• Petrochemical industry: Quality control is implemented for various industrial lubricants and base oils.

Through extensive experience in oil quality testing, operators frequently encounter the following challenges; this instrument offers targeted solutions:

• Problem 1: Manual operation is cumbersome and hazardous
  • Key challenge: Traditional methods require manual titration and involve direct exposure of operators to toxic organic solvents (e.g., extraction solutions).
  • Solution: The instrument employs microcomputer-controlled automation for complete liquid addition and titration. Reagents are stored in specially designed glass bottles, eliminating manual contact with reagents and effectively safeguarding personnel health.
• Problem 2: Significant subjective error in endpoint determination
  • Key challenge: Manual observation of color changes to determine the titration endpoint is significantly affected by visual fatigue and light conditions.
  • Solution: Equipped with a self-developed "titration endpoint detection algorithm" that automatically identifies the endpoint, eliminating subjective errors associated with manual judgment.
• Problem 3: Pipeline blockage and maintenance difficulties
  • Key issue: Residual reagents can easily cause blockages in micro-titration needles and tubing systems.
  • Solution: The instrument is equipped with a "system cleaning" function, allowing the tubing to be rinsed with anhydrous ethanol after use. Additionally, it features a peristaltic pump pressure plate adjustment mechanism to prevent long-term deformation of the pump tubing due to compression.

To further validate the instrument's performance under real-world conditions, we gathered multiple typical application cases from the power and petrochemical industries, demonstrating its capability to address challenges in complex scenarios.

• Problem Background: A main transformer operating at this station for 15 years exhibited clear oil samples visually, but chromatographic analysis revealed signs of localized overheating. Traditional manual titration proved ineffective due to the extremely low acid value (<0.03 mg KOH/g), making color changes difficult to detect; repeated test results fluctuated between 0.02 and 0.05, rendering it impossible to determine whether immediate oil filtration or replacement was required.
• Key challenges in detection: Insufficient resolution within the low acid value range, coupled with decreased sensitivity of the human eye to subtle color changes due to fatigue, resulting in a high risk of misjudgment.
• Treatment outcome: Upon activation of the fully automated oleic acid analyzer, utilizing its minimum resolution of 0.001 mg KOH/g and background blank subtraction function, three consecutive measurements consistently yielded results of 0.028 mg KOH/g. These data unequivocally indicated that the oil had entered the accelerated aging phase; accordingly, the operations team proactively arranged vacuum oil filtration treatment, successfully preventing further degradation of the insulating paper.

• Problem Background: The heavy-duty lubricating oil used in the compressor units of a petrochemical plant is highly susceptible to moisture contamination during sampling, leading to emulsification. This results in unclear layering of traditional extraction solutions, a "tail effect" at the titration endpoint, testing times exceeding 10 minutes per run, and significant result variability.
• Key challenges in detection: poor sample homogeneity and uneven manual stirring intensity lead to incomplete reactions; the emulsion layer interferes with the determination of the optical endpoint.
• Treatment efficacy: The instrument's built-in powerful magnetic stirring system ensures thorough mixing of high-viscosity samples, combined with automated titration endpoint detection logic, effectively eliminating optical interference from the emulsion layer. The testing cycle is reduced to 2 minutes and 15 seconds, with RSD (repeatability standard deviation) controlled within 3%, providing reliable data for equipment maintenance decisions.

• Problem Background: Offshore platforms feature confined spaces, high humidity, intense vibrations, and a shortage of specialized chemical analysts. Traditional glass burettes are prone to breakage during vibration, while volatile solvents pose safety hazards within sealed compartments.
• Key challenges in detection: Environmental vibrations may affect liquid level readings; high humidity can cause reagents to absorb moisture and deteriorate; and operator proficiency varies significantly.
• Performance advantages: The instrument features a fully enclosed reagent bottle design and specialized glass containers for storage, completely preventing moisture ingress and volatilization; its one-touch Chinese-language touchscreen interface lowers the operational skill threshold; the compact 9 kg unit with shock-resistant construction ensures stable operation even under sea conditions of up to Category 6. The platform enables "sample collection followed by immediate analysis and storage," with data directly exported via USB drive eliminating the need for manual recording and completely removing safety hazards.

• Problem Background: During the annual spring inspection period, the maintenance center must complete a comprehensive acid value analysis of 150 oil samples from 30 surrounding substations within two weeks. The existing two manual titration systems require four laboratory technicians to work overtime, yet frequent recording errors and calculation inaccuracies still occur due to rushed processing schedules.
• Key challenges in testing: difficulties in quality control under high-throughput conditions; errors in the "last mile" of manual calculation and data entry; high reagent consumption leading to elevated costs.
• Treatment outcome: The installation of three fully automated oleic acid determination instruments (capable of processing 1–3 sample cups simultaneously) achieved an average processing speed of 2 minutes per sample, increasing daily throughput to over 100 samples. These instruments automatically calculate and store 35 data sets while generating reports, completely eliminating calculation and input errors. Additionally, precise microtitration technology reduced reagent consumption by approximately 40%, significantly lowering hazardous waste treatment costs.

epilogue :

The introduction of this fully automated oleic acid analyzer marks the transition of oil analysis from "manual laboratories" to "digital intelligent terminals." With a high recovery rate of 98%–103%, extremely low repeatability errors, and exceptional adaptability under extreme operating conditions as demonstrated in practical applications, it stands as the ideal choice for modern laboratories seeking both high efficiency and precision

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