TimePower TP656 Petroleum Products Water-Soluble Acid and Alkali Determination Instrument
| Brand | TimePower |
|---|---|
| Origin | Beijing, China |
| Manufacturer Type | Direct Manufacturer |
| Product Origin | Domestic (China) |
| Model | TP656 |
| Heating Power | 200 W |
| Temperature Control Accuracy | ≤ ±1 °C |
| Magnetic Stirring Power | 3 W |
| Electric Stirring Power | 30 W |
| Magnetic Stirring Speed Range | 0–2400 rpm |
| Electric Stirring Speed Range | 0–3000 rpm |
| Total Power Consumption | ≤ 1200 W |
| Supply Voltage | AC 220 V ±10%, 50 Hz ±10% |
| pH Meter Range | 0.00–14.00 pH |
| pH Meter Accuracy | ±0.02 pH |
| pH Resolution | 0.01 pH |
| pH Repeatability | ≤1% |
| pH Stability | ±1% F.S./4 h |
| Response Time (T90) | <1 min at 25 °C |
| Temperature Control Range | Ambient to 100 °C |
| Temperature Compensation Range | 0.1–60.0 °C |
| Sample Temperature Range | 5–60 °C |
| Operating Ambient Temperature | 5–40 °C |
| Relative Humidity | ≤85% |
Overview
The TimePower TP656 Petroleum Products Water-Soluble Acid and Alkali Determination Instrument is a dedicated analytical system engineered for precise quantification of water-soluble acidic and alkaline components in petroleum-based fluids—including gasoline, diesel, lubricating oils, base stocks, and additive packages—according to the methodology specified in GB/T 511 (equivalent in scope to ASTM D974 and ISO 6618). The instrument implements a standardized aqueous extraction protocol followed by potentiometric titration or direct pH measurement of the extracted aqueous phase. Its integrated architecture combines controlled thermal conditioning, dual-mode mechanical agitation (magnetic and motor-driven), and high-fidelity pH metrology to ensure reproducible phase separation and accurate endpoint detection. Designed for routine QC laboratories in power generation, refinery operations, petrochemical R&D, and third-party testing facilities, the TP656 eliminates manual heating and shaking steps, thereby reducing operator variability and improving inter-laboratory comparability.
Key Features
- Integrated triple-function thermal-agitation platform: simultaneous independent operation of thermostatic water bath, magnetic stirrer (0–2400 rpm), and overhead electric stirrer (0–3000 rpm), enabling optimized dispersion and extraction kinetics across diverse viscosity ranges.
- High-resolution 24-bit A/D signal acquisition circuitry ensures stable analog-to-digital conversion for both temperature and pH sensing channels, minimizing quantization error and supporting GLP-compliant data integrity.
- Dedicated benchtop pH meter with NIST-traceable calibration capability, featuring 0.01 pH resolution, ±0.02 pH accuracy, and T90 response time <60 s at 25 °C—meeting requirements for USP and ASTM E70 compliance in regulated environments.
- Programmable temperature control (ambient to 100 °C) with ±1 °C stability, supporting standardized extraction conditions per GB/T 511 Section 6.2 (e.g., 50–60 °C water preheating for high-viscosity samples).
- Modular glassware assembly compliant with GB/T 511 Annex A specifications, including calibrated separatory funnels, conical flasks, and filtration apparatus—ensuring geometric consistency critical for phase separation repeatability.
Sample Compatibility & Compliance
The TP656 accommodates a broad spectrum of petroleum matrices: light distillates (e.g., gasoline, naphtha), middle distillates (diesel, jet fuel), residual fuels (bunker oil), lubricants (mineral and synthetic), greases, waxes (paraffin, microcrystalline), and additive concentrates. It supports sample preparation protocols defined for viscous or semi-solid materials—including pre-dilution with solvent (e.g., 50 mL gasoline for samples with kinematic viscosity >75 mm²/s at 50 °C) and controlled melting/filtration workflows for waxy or gelled specimens. The system conforms to national and international standards governing petroleum product purity assessment, including GB/T 511, ASTM D974 (Standard Test Method for Acid and Base Number by Color-Indicator Titration), and ISO 6618 (Petroleum products — Determination of water-soluble acids and alkalis). All electronic subsystems are designed to meet IEC 61000-4 electromagnetic compatibility requirements for laboratory instrumentation.
Software & Data Management
While the TP656 operates as a standalone hardware platform without embedded PC software, its pH meter module supports RS232/USB output for external data logging into LIMS or ELN systems. Measurement records—including timestamped pH values, temperature readings, and user-defined test IDs—can be exported in CSV format. The instrument’s electronic controller maintains audit-ready operational logs (e.g., power-on cycles, temperature setpoint changes, stirrer activation events), satisfying foundational traceability needs under ISO/IEC 17025 and internal GLP policies. Optional integration with validated chromatography or titration software suites enables automated pass/fail evaluation against specification limits (e.g., “water-soluble acid content <0.01 mg KOH/g” per turbine oil OEM specifications).
Applications
- Quality control of in-service turbine oils and hydraulic fluids for early detection of oxidative degradation via rising acid number trends.
- Verification of neutralization efficiency in post-treatment refining streams (e.g., caustic washing units).
- Stability assessment of lubricant formulations during accelerated oxidation testing (ASTM D943, D2272).
- Compliance screening of marine fuels against IMO MARPOL Annex VI sulfur and acidity limits.
- Research-grade investigation of acid/base equilibrium in multifunctional additive packages containing sulfonates, phenates, and amine inhibitors.
FAQ
Does the TP656 perform automatic titration, or is it limited to pH measurement?
The TP656 is configured for direct pH-based determination of water-soluble acidity/alkalinity per GB/T 511 Section 7. It does not include burette drive mechanics or reagent dispensing modules required for potentiometric titration; however, its precision pH subsystem provides sufficient resolution for classification per ASTM D974 Annex A (color-indicator method equivalence).
Can the instrument handle samples with very high wax content, such as cylinder oils?
Yes—when used with the prescribed melting/filtration workflow (GB/T 511 Section 6.4), the TP656’s 100 °C heating capability and dual-stirring system ensure complete homogenization and aqueous phase recovery from wax-rich matrices prior to pH analysis.
Is the pH electrode included calibrated and certified?
A standard refillable combination pH electrode is supplied with factory calibration certificate (traceable to NIST SRM 186), valid for initial use. Users must perform two-point calibration (pH 4.01 and 7.00 buffers) before first operation and at least daily during continuous use, per ISO 7027 and CLSI EP22-A guidelines.
What safety protections are built into the heating and stirring subsystems?
Thermal runaway prevention includes overtemperature cutoff (105 °C limit), dry-run detection for water bath, and stall-sensing for electric stirrer motors. All electrical enclosures comply with IP20 ingress protection and double-insulation requirements per IEC 61010-1.
