Water-soluble Acid Tester
Industrial Water-soluble Acid Tester Supplier | Custom Model & OEM Available
Company Profile
Wuhan Goldhome Hipot Electrical Co., Ltd. was established in 2008, located in Economic and Technical Development Zone, working area more than 10000 square meters.We are professional OEM, ODM, OBM Manufacturer which is engaged in the research, development, sale and service of High Voltage Testing Equipment including: AC Series Resonant Test Systems, AC DC Hipot Testers, Lightning Impulse Voltage Generator, Primary Current Injection Testers, CT PT Analyzer, Transformer Turns Ratio, Insulation Resistance Tester,Circuit Breaker Testers, Relay Protection Testers, Cable Fault Locator, SF6 Comprehensive Analyzers, Transformer Oil Test Device, etc.
High Quality
Reliable Quality for Safe Power.
advanced equipment
Precision Equipment,Superior Performance
professional team
51 professional technicians, Advanced Solutions
Custom Service
Technical Consultation:≤1 H
Quotation:≤2 H
The water-soluble acid tester is an automated analytical instrument specifically designed to measure the water-soluble acid content in petroleum products, such as transformer oil and turbine oil. It simulates the process by which acidic substances are released when oil is mixed with water, thereby determining whether the oil has deteriorated or become contaminated.
Why measure water-soluble acids?
To prevent equipment corrosion
Water-soluble acids directly corrode:
Metal components such as transformers, switches and oil tanks
Insulating paper, insulating oil and sealing materials
Over time, this can lead to rust, leaks and reduced insulation, and in severe cases, cause equipment failure.
To assess the degree of insulation oil ageing
Transformer oil and turbine oil are subjected to heat and oxidation during operation, continuously generating acidic substances.
Increased water-soluble acid content = oil quality ageing and deterioration
Values exceeding the limit = oil must be replaced or filtered
This is a mandatory indicator used by power systems to determine whether oil can continue to be used.
Preventing Insulation Failure and Accidents
Acidic substances degrade insulation performance:
Decreased insulation resistance
Increased dielectric loss
Increased susceptibility to partial discharge and breakdown
This directly threatens the safe operation of transformers and high-voltage equipment.
Compliance with National Standards / Mandatory Industry Requirements
Standards commonly applied in the power and petrochemical industries:
GB/T 7598 Method for the Determination of Water-Soluble Acids
Operating transformer oil typically requires a pH of water-soluble acids ≥ 4.2
Without testing, it is impossible to determine whether the oil meets specifications.
Extending equipment service life
Early detection of excessive acid values and prompt action:
Filtration and regeneration
Replacement with new oil
Can significantly reduce maintenance, extend equipment life and lower operating costs.
Working Procedure
Sampling and mixing
Add the oil sample to be tested and distilled water in the specified ratio to a test tube or extraction cup.
Heating and agitation
The instrument automatically heats and agitates vigorously to ensure that the water-soluble acids in the oil are fully dissolved into the water.
The temperature is generally maintained between 70 and 80°C.
Agitation accelerates the extraction process.
Standing and separation
Once agitation ceases, the oil and water will naturally separate into layers:
Upper layer: Oil
Lower layer: Water solution containing acids
Separation and Collection of the Aqueous Phase
The instrument automatically extracts the lower aqueous phase to prevent oil from interfering with the analysis.
Analysis and Interpretation (Two Methods)
Method 1: Colorimetric Method (Most Commonly Used)
Add an indicator (e.g. bromophenol blue, bromophenol violet)
Change in colour of the aqueous phase → Compare with standard colour chart → Determine pH
Simple and rapid, suitable for on-site batch testing
Method 2: Potentiometric titration / pH electrode method
Directly measure the pH of the aqueous phase using a pH electrode
Higher precision, with automatic calculation of acid value
Primarily used for precise laboratory analysis
Result evaluation
Determine whether water-soluble acids meet specifications based on pH:
In-service transformer oil generally requires pH ≥ 4.2
Excessively low pH = Excessive water-soluble acids = Oil has aged, posing a risk of corrosion
Key Features
Fully automated integrated testing
The entire process—including heating, agitation, extraction, separation and detection—is completed automatically, eliminating the need for frequent manual intervention and delivering results at the touch of a button.
Strict compliance with national standards
Designed in accordance with the GB/T 7598 standard, the testing procedure is standardised, and the results are suitable for acceptance and annual inspections in the power and petrochemical industries.
High-precision pH detection
Utilises imported pH electrodes or a precision colorimetric system to ensure accurate and reproducible measurements, enabling a clear determination of whether the oil meets specifications.
Precise temperature control and thorough extraction
Temperature is maintained at 70–80°C with uniform agitation, ensuring complete extraction of water-soluble acids and preventing underestimation of results.
Multi-channel Parallel Testing for High Efficiency
Supports simultaneous testing across multiple cuvettes, allowing multiple samples to be processed at once, significantly enhancing laboratory testing efficiency.
Automatic Oil-Water Separation for Safe Operation
Automatic separation of layers after extraction eliminates the need for manual decanting, reducing contact with reagents and minimising operational errors and safety risks.
Large screen display, intuitive data
The LCD screen directly displays pH values, test duration, temperature and other parameters, and supports data storage, printing and historical queries.
Stable construction, simple maintenance
The unit is designed for durability, with tubing that is resistant to blockages and easy to clean, making it suitable for long-term continuous use.
Wide range of applications
Suitable for testing water-soluble acids in various oils, including transformer oil, turbine oil, lubricating oil and insulating oil.
Typical Applications
Power companies / power supply bureau laboratories
To test for water-soluble acids in transformer oil, instrument transformer oil and switchgear oil, assess the risk of oil ageing and corrosion, and ensure the safe operation of power grid equipment.
01
Power stations (thermal, hydroelectric and renewable energy plants)
Used for routine testing of turbine oil, insulating oil and lubricating oil, serving as essential tests for regular equipment maintenance and oil quality monitoring.
02
Transformer and Electrical Equipment Manufacturers
Inspection of new oil upon receipt and testing of finished products prior to dispatch, to ensure the quality of insulating oil meets national standards.
03
Petrochemical & Lubricant Manufacturers
Quality control of crude oil, fuel oil, lubricants, hydraulic oil and other products, testing whether water-soluble acids and acid numbers meet specifications.
04
Third-party testing organisations / Quality Inspection Institutes
Oil testing, arbitration analysis and type testing, issuing authoritative test reports.
05
Equipment Maintenance Departments in Industrial and Mining Enterprises
Enterprises in the steel, metallurgy, mining and cement sectors conduct regular monitoring of lubricating oils for large electric motors and power generation units.
06
Railway and Rail Transit Operations and Maintenance Laboratories
Testing of locomotive transformer oil and hydraulic oil to ensure the safety and reliability of locomotive traction systems.
07
University & Research Institute Laboratories
Research into oil ageing, performance testing of insulating materials, and teaching and research in chemical analysis.
08
Famous Brand
Domestic Brands
1.Wuhan Goldhome Hipot Electrical Co., Ltd.
Brand Positioning: A specialist domestic manufacturer of power and petrochemical testing equipment, with a deep focus on the power and petrochemical sectors. The company specialises in fully automatic, highly reliable oil analysis instruments that comply with national standards, and is a leading supplier of water-soluble acid testers for the power sector.
Core Products
- HMJS-3 Water-Soluble Acid Value Tester for Oil: 12 sample positions (6 groups in parallel), imported colour sensor, dual-indicator (bromophenol green / bromophenol violet) automatic colourimetry, accuracy ≤±0.05pH, compliant with GB/T 7598-2008.
- HM203 Automatic Water-Soluble Acid Tester: Fully automatic integrated system; completes heating, agitation, extraction, separation, colourimetry, display and printing with a single button press.
Brand Advantages
- Deeply tailored to the power industry, with extensive on-site validation
- Localised service, rapid after-sales response
- High cost-effectiveness, suitable for power, petrochemical, industrial and mining sectors, and third-party testing
2. Guodian Xigao (Wuhan)
- Product: GDRS-410 Fully Automatic Water-Soluble Acid Analyser
- Features: Microprocessor control, large LCD screen, tests 3 samples at once, high stability
- Advantages: Well-known in the power testing sector, strict quality control, high accuracy
Foreign Brand:
1. Mettler Toledo (Switzerland)
- Brand Status: Global leader in laboratory analytical instruments, with over 70 years of technical expertise in pH measurement
- Products: Potentiometric titrators and pH meters, suitable for water-soluble acid testing
- Advantages: Extremely high precision (±0.001 pH), high degree of automation, compliant with international standards (ASTM, ISO), suitable for high-end laboratories
2. Thermo Fisher (USA)
- Brand Position: Global leader in the scientific services sector
- Products: pH meters, automated titration systems, suitable for detecting water-soluble acids in oils
- Advantages: Advanced technology, reliable data, suitable for research and high-end industrial testing
3. Hach (USA)
- Brand Position: Global leader in water quality analysis instruments
- Products: pH analysers, titrators, suitable for detecting water-soluble acids
- Advantages: Excellent stability, suitable for industrial online and laboratory testing
4. Metrohm (Switzerland)
- Brand Position: Global leader in potentiometric titration technology
- Products: Ti-Touch series automatic potentiometric titrators, configurable with modules for the detection of water-soluble acids
- Advantages: Precise dosing technology, compliant with FDA 21 CFR Part 11, suitable for high-end testing in the pharmaceutical and petrochemical industries
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FAQ
Q: 1. What are water-soluble acids? Why are they tested?
A: Water-soluble acids are acidic substances in oil that are soluble in water; they primarily result from the oxidation, ageing or contamination of the oil.
Purpose of testing:
To determine whether transformer oil, insulating oil or turbine oil has aged
To prevent acidic substances from corroding equipment and reducing insulation performance
To meet the mandatory requirements of national standards and industry annual inspections
Q: 2. Which standards do water-soluble acid testers comply with?
A: Mainly compliant with:
GB/T 7598 Determination of water-soluble acids in transformer oil and turbine oil in service (colorimetric method)
Some models are also compatible with ASTM D 664 and relevant IEC standards
Q: 3. What samples can the instrument test?
A: Suitable for:
Transformer oil, insulating oil, instrument transformer oil
Turbine oil, lubricating oil, fire-resistant oil
Water-soluble acid testing of other petroleum products
Q: 4. How long does a single test take?
A: Fully automatic models typically take 15–25 minutes per batch
Includes: heating → shaking and extraction → settling and separation → addition of indicator → colourimetric pH measurement → printing of results
Q: 5. How many samples can be tested at once?
A: Common configurations:
3 sets / 6 cups
6 sets / 12 cups (e.g. Guodian Huamei HMJS-3)
Batch testing is possible, enhancing laboratory efficiency.
Q: 6. What is the measurement accuracy?
A: Standard accuracy:
pH measurement error: ≤±0.05 pH
Repeatability: ≤0.05 pH
Fully meets acceptance requirements for the power and petrochemical industries.
Q: 7. Is operation complicated? Is specialist personnel required?
A: Fully automatic instruments feature one-button operation:
Place sample → Start programme → Automatic completion
No frequent manual intervention required; ordinary laboratory technicians can operate the instrument after simple training.
Q: 8. What reagents are required?
A: Common reagents:
Distilled water (boiled and cooled)
Bromophenol green indicator
Bromophenol purple indicator
Anhydrous ethanol (for cleaning)
Reagents are readily available and low-cost.
Q: 9. Does the instrument clean itself automatically?
A: High-end models support automatic tubing cleaning,
using anhydrous ethanol to automatically flush the cuvettes and tubing, preventing cross-contamination and reducing manual workload.
Q: 10. Can results be saved and printed?
A: Supported:
Built-in thermal printer for automatic printing
Stores ≥100 sets of historical data
Some models support export to USB drive
Q: 11. What are the advantages of the Guodian Huamei Water-Soluble Acid Analyser?
A: Strict compliance with GB/T 7598
Fully automatic, integrated system with multi-channel batch testing
Imported photoelectric sensors for precise colourimetry
Large touchscreen with Chinese interface
Proven application in the power industry with rapid after-sales response
Representative models: HMJS 3, HM203
Q: 12. What should I do if the instrument produces inaccurate results?
A: Common causes and solutions:
Reagents expired or contaminated → Replace with new reagents
Colorimetric cell dirty → Automatic/manual cleaning
Blank calibration not performed → Repeat blank calibration
Sample emulsified → Resample and retest
Q: 13. Is the instrument high-maintenance?
A: After each test: Automatic cleaning
Monthly: Inspect tubing, clean sensors
Every six months: Manufacturer calibration
Simple maintenance, low failure rate.
Q: 14. What should I do if there is air in the indicator tubing?
A: If the instrument has not been used for a long time or there are bubbles in the tubing, perform the indicator degassing procedure:
Place the waste cup in cup position 1
Click ‘Indicator Venting’ on the main interface
Click ‘Bromophenol Violet Venting’ or ‘Bromophenol Green Venting’ respectively
Exit once the needle begins to dispense liquid
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