HZSR-6 Automatic Water Soluble Insulating Oil Acidity Measuring Instrument
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HZSR-6 Automatic Water Soluble Insulating Oil Acidity Measuring Instrument
Introduction
The HZSR-6 Automatic Water Soluble Oil Acidity Measuring Instrument is a specialized laboratory instrument designed for the rapid, automated determination of water-soluble acid content (expressed as pH value) in transformer oils, turbine oils, lubricating oils, and other liquid petroleum products.
Key Engineering Features
High-Throughput 6-Sample Batch Processing: Features 6 independent heating and extraction chambers. Operators can test any combination from 1 to 6 samples in a single automated cycle, dramatically improving daily laboratory throughput.
Complete Hands-Off Automated Extraction: Fully mechanizes the rigorous chemical extraction sequence: automatically heats the 50ml oil/water mixture to exactly 80 ℃, applies intensive mechanical oscillation for 5 minutes, activates cooling fans, and maintains static resting for clean gravity phase stratification.
Dual-Wavelength / Dual-Indicator Optical Colorimetry: Eliminates human visual subjectivity by automatically titrating exact micro-doses (9 drops each) of Bromocresol Green (transition range 3.8–5.4, yellow to blue) and Bromocresol Purple (transition range 5.2–6.8, yellow to purple) into separate extracted aqueous aliquots, measuring chromaticity against calibrated factory buffer curves.
Elimination of Cross-Contamination via Disposable Cuvettes: Uses low-cost, disposable optical reaction cups (3 per sample, up to 18 per batch) for the color development stage, preventing chemical carryover and eliminating tedious glassware cleaning.
Pre-Stored Multi-Point Calibration Matrix: Factory-calibrated across 16 discrete standard buffer solutions from pH 4.0 to 7.0 at 0.2 pH increments, complete with automated optical white balance correction.
Integrated Ethanol Solvent Cleaning Cycle: Features a dedicated automated cleaning program. Operators simply introduce ethanol into position No. 1 and touch "Start"; the instrument flushes internal extraction valves and lines before initiating automated shutdown.
Zero-Exposure Operator Protection: Enclosed extraction and automated waste drainage keep operators completely isolated from volatile vapors, hot oil splatters, and chemical staining indicators.
Technical Specifications
| Parameter | Specification Value | Testing & Engineering Notes |
|---|---|---|
| Model | HZSR-6 | 6-Cup high-throughput automated oil acid tester |
| Testing Standard | GB/T 7598-2008 | Automated spectrophotometric colorimetric method |
| Simultaneous Sample Capacity | 1 ~ 6 samples | User-selectable batch size (1, 2, 3, 4, 5, or 6 channels) |
| pH Measurement Range | pH 4.0 ~ pH 7.0 | Covers critical aging and degradation thresholds |
| Measurement Error (Accuracy) | ≤±0.05 pH≤±0.05 pH | Compared against standard buffer calibration curves |
| Repeatability | ≤0.05 pH≤0.05 pH | High intra-batch and inter-batch reproducibility |
| Sample Extraction Ratio | 50 ml oil sample : 50 ml deionized water | Pre-boiled deionized water (purged of dissolved CO2CO2) |
| Extraction Heating Temperature | Controlled to 80 ℃ | Standard-compliant thermal extraction of water-soluble acids |
| Mechanical Oscillation Time | 5 minutes | Accompanied by integrated forced-air cooling fan |
| Colorimetric Detection Method | Dual-indicator optical colorimetry | Bromocresol Green (pH 3.8–5.4) & Bromocresol Purple (pH 5.2–6.8) |
| Titration Mechanism | Dual precision peristaltic metering pumps | Controlled micro-drop dosing (9 drops per indicator channel) |
| Reaction Vessel System | 3 to 18 disposable optical reaction cuvettes | Eliminates cross-contamination between consecutive runs |
| User Interface & Display | Color LCD Touchscreen | Graphical step-by-step workflow with real-time status |
| Data Output & Storage | Built-in thermal micro-printer + Non-volatile memory | Instant on-site receipt printing and historical data query |
| Cleaning System | Automated ethanol solvent wash cycle | Cleans internal manifold lines prior to automated shutdown |
| Operating Power Supply | AC 220 V ± 10%, 50 Hz | Grounded laboratory power socket |
| Operating Power Rating | 500 W | Rapid electric heating and multi-channel oscillation |
| Environmental Operating Limits | Temperature: +10 ℃ ~ +45 ℃ Humidity: < 85% RH |
Non-condensing laboratory environment |
Compliance & Analytical Testing Standards
| Standard Reference | Standard Title & Focus | Application to HZSR-6 Analytical Procedure |
|---|---|---|
| GB/T 7598-2008 | Test method for water-soluble acids in transformer oil and turbine oil by colorimetry | Core design benchmark: governs 50ml/50ml oil-water extraction ratio, 80 ℃ heating, 5-min oscillation, and dual-indicator titration |
| DL/T 596 | Preventive test code for electric power equipment | Establishes in-service transformer insulating oil acceptance criteria: pH≥5.4pH≥5.4 for normal operation; pH<4.2pH<4.2 requires urgent oil reclamation |
| IEC 60422 | Mineral insulating oils in electrical equipment - Supervision and maintenance guidance | Diagnostic guidance on acid accumulation, low-molecular-weight degradation by-products, and sludge risk |
| IEC 60296 | Fluids for electrotechnical applications - Unused mineral insulating oils for transformers and switchgear | Purity benchmarks and baseline acidity requirements for unaged electrical insulating oils |
Industrial Application Scenarios
High-Voltage Transmission & Grid Substation Maintenance: Routine surveillance of transformer oil degradation to detect paper insulation hydrolytic breakdown and prevent sludge formation.
Fossil, Nuclear & Hydroelectric Power Stations: Scheduled oil quality monitoring of turbine governor systems and generator step-up (GSU) transformer fluids.
Transformer Manufacturing & Factory Quality Assurance (FAT): Establishing certified baseline water-soluble acid values on freshly refined oil deliveries prior to factory transformer filling.
Petroleum Refining & Lubricant Manufacturing Facilities: Analytical batch inspection, quality assurance, and standard compliance verification of specialty electrical insulating liquids.
Commercial Fluid Testing & Condition Monitoring Laboratories: High-volume commercial testing services supporting predictive asset management programs.
FAQ
Why is water-soluble acid (pH) determination critical for transformer insulating oil, and how does it differ from total acid number (TAN)?
Total acid number (TAN), per ASTM D974, measures both heavy oil-soluble organic acids and light water-soluble acids. Water-soluble acids, such as formic and acetic acids, are more chemically aggressive. They dissolve readily in trace moisture and migrate into cellulose paper insulation, where they catalyze hydrolytic cleavage of the cellulose polymer chains. This accelerates paper embrittlement and produces conductive moisture. Measuring water-soluble acid (pH) targets the corrosive fraction that drives paper aging, copper corrosion, and insulation failure.
What diagnostic threshold limits apply to water-soluble acid pH in operating transformers?
Per DL/T 596 and IEC 60422, unused oil must be essentially neutral, with pH at least about 6.5 to 7.0 and no detectable water-soluble acid. In-service oil is considered normal at pH 5.4 or higher. A pH between 4.5 and 5.4 indicates active oil oxidation and paper degradation and requires closer monitoring. When pH falls below 4.2, copper corrosion and rapid paper depolymerization are underway, and oil reclamation or complete oil replacement is required.
Why must deionized water be boiled for 5 minutes before sample injection?
Ambient air contains about 400 ppm of carbon dioxide. Stored deionized water absorbs that CO₂ and forms carbonic acid, which can lower the unbuffered water's pH to about 5.5–6.0. Boiling deionized or distilled water vigorously for at least 5 minutes removes dissolved CO₂. Cool the water in a closed vessel and use it at once, with a neutral baseline of pH 6.0–7.0 and conductivity below 3 µS/cm at 25°C, to avoid false acidic readings.
Why does the HZSR-6 use both bromocresol green and bromocresol purple?
No single visual indicator gives a linear color shift across the full pH 4.0 to 7.0 range. Bromocresol green is sensitive from pH 3.8 to 5.4, changing from yellow to blue. Bromocresol purple covers pH 5.2 to 6.8, changing from yellow to purple. By titrating aliquots of the extracted aqueous layer into two optical cuvettes with both indicators, the HZSR-6 reaches about ±0.05 pH resolution across the diagnostic range.
What routine maintenance is required for the peristaltic pumps and sampling tubing?
After daily testing, run the automatic ethanol cleaning routine to flush oil droplets and color indicators from the fluid lines. Then open the front cabinet and release the pressure levers on the peristaltic pump arms. Releasing the arms prevents permanent compression of the flexible tubing and extends tubing life.
Can the HZSR-6 test fewer than 6 samples in one cycle?
Yes. Channels can be selected individually on the touchscreen. Any cup position or subset, such as Cup 1 and Cup 2 only, can be loaded and run. Unused positions are bypassed automatically, which saves time and reagents.
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