PULUODY PSD-650 Transformer Oil Sampling Kit
| Brand | PULUODY |
|---|---|
| Origin | Shaanxi, China |
| Manufacturer Type | Authorized Distributor |
| Country of Origin | China |
| Model | PSD-650 |
| Price | USD 2,500 (FOB) |
Overview
The PULUODY PSD-650 Transformer Oil Sampling Kit is a precision-engineered, contamination-controlled sampling system designed exclusively for the collection of representative insulating oil samples from energized power transformers. It operates on the principle of closed-loop, vacuum-assisted extraction using gas-tight glass syringes—ensuring zero exposure to ambient air, moisture, or particulate contaminants during sampling. This methodology directly addresses the core challenge in dissolved gas analysis (DGA): the thermodynamic instability of key fault gases (H₂, CH₄, C₂H₂, C₂H₄, C₂H₆, CO, CO₂, O₂, N₂) dissolved in mineral oil under operational conditions. Even minor deviations in sampling protocol—including temperature fluctuations, headspace introduction, or mechanical agitation—can induce gas partitioning shifts, leading to non-reproducible DGA chromatograms and misdiagnosis of incipient faults such as partial discharge, thermal degradation, or arcing. The PSD-650 kit eliminates these variables by enforcing strict adherence to standardized physical sampling geometry, flow dynamics, and pressure equilibrium protocols defined in IEC 60475 and ASTM D923. Its design supports real-time oil temperature logging at the point of extraction—a critical metadata parameter required for Henry’s law-based gas solubility correction in laboratory DGA interpretation.
Key Features
- Gas-tight borosilicate glass syringes (100 mL nominal volume) with PTFE-coated stainless steel plungers and Luer-lock sealing interfaces—certified for <1.0 × 10⁻⁸ atm·mL/s helium leak rate per ISO 15851
- Integrated vacuum pump module with calibrated pressure gauge (range: 0–100 kPa absolute) and automatic cut-off at preset negative pressure (–85 kPa typical)
- Thermally insulated sampling probe with embedded Pt100 RTD sensor (±0.2°C accuracy) and digital readout for concurrent oil temperature recording
- Modular stainless steel manifold assembly with isolation valves, purge ports, and dedicated vent lines—enabling sequential sampling without cross-contamination
- Compliance-ready documentation package including calibration certificates for syringes and temperature sensor, traceable to NIM (China National Institute of Metrology)
Sample Compatibility & Compliance
The PSD-650 is validated for use with mineral-based, silicone-based, and ester-based transformer insulating oils (IEC 60296, ASTM D3487, ASTM D6871). It meets the mechanical, chemical, and procedural requirements specified in GB/T 7597–2007 (Chinese national standard), IEC 60475:2011 (Edition 2.0), and ASTM D923–22 (Standard Practice for Sampling Electrical Insulating Oils). All wetted components are inert to hydrocarbon solvents and resistant to oxidation at temperatures up to 105°C. The system architecture supports GLP-compliant workflows: each syringe carries a unique serialized identifier; temperature logs are timestamped and exportable via USB; and valve operation sequences follow auditable step-by-step checklists aligned with ISO/IEC 17025 clause 7.7 (Sampling). No component introduces extractables that interfere with GC-TCD/FID or GC-MS detection of sub-ppm gas concentrations.
Software & Data Management
While the PSD-650 is a hardware-only sampling platform, it integrates seamlessly into digital DGA ecosystems via its structured metadata output. The embedded temperature sensor exports ASCII-formatted .csv files containing sample ID, acquisition timestamp (UTC), oil temperature (°C), ambient pressure (kPa), and syringe batch number. These files auto-synchronize with LIMS platforms (e.g., Thermo Fisher SampleManager, LabVantage) and DGA interpretation software (Duval Triangle, Rogers Ratio, IEC 60599 diagnostics) through configurable API endpoints. Audit trails comply with FDA 21 CFR Part 11 requirements when deployed with validated electronic signature modules. Firmware updates are delivered via secure HTTPS and digitally signed by PULUODY’s PKI infrastructure.
Applications
- Routine condition monitoring of distribution and power transformers in substations (IEEE C57.104–2019 compliance)
- Commissioning verification sampling prior to energization of new or refurbished units
- Root-cause investigation following relay alarms, Buchholz trips, or abnormal infrared thermal signatures
- Moisture content correlation studies (ASTM D1533) where simultaneous water-in-oil and DGA data are required
- Field validation of online DGA monitors (e.g., GE Transfix, Siemens Sicam PAS) through comparative offline sampling
FAQ
Why must transformer oil sampling be performed under vacuum?
Vacuum extraction prevents atmospheric ingress, which would dilute dissolved gas concentrations and oxidize reactive species (e.g., acetylene), invalidating quantitative DGA results.
Can the PSD-650 be used for sampling from de-energized transformers?
Yes—provided the unit remains sealed and oil temperature is stabilized for ≥2 hours prior to sampling to ensure gas phase equilibrium.
How often should syringes be recalibrated?
Annually or after 500 sampling cycles, whichever occurs first, per ISO 15851 Annex B verification protocol.
Is the temperature sensor traceable to international standards?
Yes—each sensor is supplied with a NIM-issued calibration certificate (uncertainty ±0.15°C at 40°C) valid for 12 months.
Does the kit include instructions for ASTM D923-compliant cleaning procedures?
Yes—the user manual contains solvent selection guidelines (n-hexane, acetone), ultrasonic bath parameters, and blank testing protocols per ASTM D923 Section 7.3.
