Xuxin ST-1542 Petroleum Demulsibility Tester
| Brand | Xuxin Instrument |
|---|---|
| Origin | Beijing, China |
| Manufacturer Type | Manufacturer |
| Origin Category | Domestic |
| Model | ST-1542 |
| Pricing | Upon Request |
Overview
The Xuxin ST-1542 Petroleum Demulsibility Tester is a precision-engineered instrument designed to quantitatively evaluate the demulsification behavior of petroleum products and synthetic lubricants when mixed with water. It operates in strict accordance with internationally recognized standard test methods—including ASTM D1401 (Standard Test Method for Determining the Demulsibility Characteristics of Turbine Oils), GB/T 7305 (Petroleum Products—Determination of Emulsion Resistance), and GB/T 7605 (Turbine Oil—Determination of Demulsibility). The instrument employs a controlled thermal environment coupled with precisely regulated mechanical agitation to simulate real-world conditions under which oil–water emulsions form and separate. Its core measurement principle centers on time-resolved phase separation kinetics: after standardized mixing at 1500 ± 15 rpm for 5 minutes at a user-defined temperature (typically 54 °C or 82 °C per ASTM D1401), the system automatically initiates high-resolution timing of the volume of separated water, emulsion layer, and clear oil over a defined observation period (e.g., 30, 60, or 120 minutes). This enables objective, repeatable assessment of demulsibility performance—critical for turbine oils, hydraulic fluids, and gear oils where water ingress compromises lubricity, accelerates oxidation, and promotes corrosion.
Key Features
- Four independent test stations operating simultaneously within a single thermostatically controlled bath, enabling parallel evaluation of multiple samples under identical thermal and agitation conditions
- Microprocessor-based PID auto-tuning temperature control system with ±0.5 °C accuracy and 0.1 °C resolution across a range of ambient to 100 °C
- High-stability imported Class A PT100 platinum resistance thermometer for traceable, NIST-traceable temperature monitoring
- Automated stirring cycle: motor-driven impeller assembly delivers consistent 1500 ± 15 rpm agitation; programmable lift mechanism ensures precise immersion depth and eliminates manual handling errors
- Integrated automatic transition from agitation to timed separation phase, eliminating operator-dependent timing variability
- Low-noise, maintenance-free mechanical transmission system ensuring long-term operational stability and vibration-free measurement integrity
- Intuitive 7-inch color LCD touchscreen interface supporting full English or full Chinese language selection—configured during setup without firmware modification
- Robust stainless-steel chassis and insulated bath construction optimized for laboratory safety, thermal uniformity, and compliance with IEC 61010-1 electrical safety standards
Sample Compatibility & Compliance
The ST-1542 is validated for use with mineral-based turbine oils, synthetic ester and polyalphaolefin (PAO) lubricants, hydraulic fluids, and transformer oils. It accommodates standard 40-mL graduated glass test cylinders (ASTM D1401-compliant dimensions) and supports both single-point and multi-point demulsibility reporting formats. The instrument meets essential regulatory and quality framework requirements: its temperature control system complies with ISO/IEC 17025 calibration traceability guidelines; data acquisition protocols support GLP/GMP-aligned audit trails when integrated with external LIMS; and its hardware architecture satisfies electromagnetic compatibility (EMC) requirements per EN 61326-1. While not intrinsically rated for hazardous area operation, it is routinely deployed in Class 1, Division 2 environments when installed per NFPA 70 (NEC) Article 500 guidelines.
Software & Data Management
The ST-1542 operates via embedded firmware with no external PC dependency. All test parameters—including setpoint temperature, agitation duration, rotation speed, and observation intervals—are stored in non-volatile memory with timestamped configuration history. Measurement results are displayed in real time as layered volume readings (oil/water/emulsion) and exported via USB 2.0 to CSV-formatted files compatible with Excel, MATLAB, or laboratory informatics platforms. Optional firmware upgrade paths support future integration with OPC UA-enabled industrial networks and 21 CFR Part 11–compliant electronic signature modules for regulated pharmaceutical or power-generation QA/QC laboratories.
Applications
- Quality assurance of new turbine oils prior to commissioning in steam and gas turbine systems
- Condition monitoring of in-service lubricants in power generation facilities to detect hydrolytic degradation or additive depletion
- R&D screening of demulsifier additives and base stock formulations in lubricant manufacturing
- Contract testing services for third-party certification bodies accredited to ISO/IEC 17025
- Educational laboratories conducting ASTM-method-based experiments in tribology and fluid engineering curricula
- Regulatory compliance verification for ASTM D1401 reporting in export documentation for international trade (e.g., SGS, BV, Intertek submissions)
FAQ
What standards does the ST-1542 fully support?
It is engineered to execute ASTM D1401, GB/T 7305, and GB/T 7605 without adaptation—each method’s specific temperature, agitation, and timing sequences are pre-programmed and user-selectable.
Can the instrument be calibrated internally?
Yes—built-in calibration routines allow verification of temperature sensor output and timer accuracy using reference standards; full calibration certificates are issued upon request with optional UKAS or CNAS accreditation.
Is remote monitoring or network connectivity available?
Standard configuration is standalone; Ethernet or RS-485 interfaces are available as factory-installed options for SCADA or centralized lab equipment management systems.
What maintenance is required for long-term reliability?
Annual verification of bath fluid level, impeller alignment, and sensor drift is recommended; no consumables other than standard laboratory-grade distilled water and ASTM-specified test oils are required.
Does the ST-1542 meet environmental operating specifications for tropical climates?
It is rated for continuous operation at up to 40 °C ambient and 80% RH—performance validation reports confirm stable thermal regulation and display readability under these conditions.
