PULUODY PLD-1884B Petroleum Product Density Tester (ASTM D1298 / GB/T 1884 Compliant)

Overview

The PULUODY PLD-1884B Petroleum Product Density Tester is a precision-controlled laboratory instrument engineered for the accurate determination of density of crude oil, refined petroleum products, and non-petroleum liquid mixtures at the reference temperature of 20 °C. It operates in strict accordance with the gravimetric hydrometer method specified in GB/T 1884 (equivalent to ASTM D1298 and ISO 3675), where density is derived from the immersion depth of a calibrated glass hydrometer in a thermally stabilized sample. Unlike digital oscillating U-tube or radiation-based densitometers, the PLD-1884B provides traceable, operator-independent results by maintaining rigorous thermal equilibrium—critical for minimizing thermal expansion errors and ensuring metrological consistency across batch testing. Its design centers on long-term stability, mechanical robustness, and regulatory alignment with standard test methods used in refinery QC labs, third-party inspection agencies, and petrochemical R&D facilities.

Key Features

• Stainless steel constant-temperature bath with high optical clarity and corrosion resistance—enabling unobstructed visual monitoring of hydrometer immersion and sample homogeneity.
• Integrated temperature control architecture combining Peltier-assisted cooling, resistive heating (600 W), and PID-regulated feedback for ±0.2 °C stability across the full 5–80 °C operating range.
• Imported hermetically sealed refrigeration compressor delivering low-noise, maintenance-free operation over extended service life (>15,000 hours MTBF).
• Magnetic drive circulation pump ensures laminar, bubble-free fluid motion without shaft seals or lubricants—eliminating contamination risk and supporting reproducible thermal equilibration.
• Unified control panel integrating power management, temperature setpoint interface, LED illumination for hydrometer reading, and real-time status indicators for heating/cooling/circulation subsystems.
• Compliance-ready mechanical design: no software-based calibration routines or embedded data storage—fully compatible with GLP environments requiring manual recordkeeping and audit-trail simplicity.

Sample Compatibility & Compliance

The PLD-1884B accommodates standard ASTM D1298 hydrometers (e.g., ASTM IP 160, API MPMS Ch. 9.1) and supports samples with kinematic viscosities up to 200 mm²/s at 20 °C—including gasoline, diesel, kerosene, base oils, biodiesel blends, and aromatic solvents. It is not intended for highly volatile, corrosive, or particulate-laden fluids without prior filtration or stabilization. The instrument meets national and international regulatory expectations for physical property testing: fully aligned with GB/T 1884–2000, ASTM D1298–22, and ISO 3675:2022. Its analog, non-networked architecture avoids cybersecurity constraints while satisfying documentation requirements under ISO/IEC 17025 accredited laboratories and refinery QA protocols referencing API RP 2555 or EN 12977.

Software & Data Management

The PLD-1884B operates as a standalone hardware platform with no embedded firmware, touchscreen interface, or proprietary software. All operational parameters are adjusted manually via front-panel controls; temperature is monitored using a calibrated PT100 sensor with analog output (optional 4–20 mA signal available upon request). Data recording follows traditional lab practice: users log bath temperature, observed hydrometer scale reading, meniscus correction, and calculated density manually in bound notebooks or LIMS-integrated worksheets. This architecture ensures compliance with FDA 21 CFR Part 11 (where electronic records are not generated), simplifies validation (IQ/OQ/PQ), and eliminates software qualification burdens common in regulated GMP or ISO 17025 environments.

Applications

• Refinery quality control: Routine density verification of naphtha, reformate, and vacuum gas oil per ASTM D1298 before blending or custody transfer.
• Fuel specification compliance: Verification of diesel fuel density per EN 590 or ASTM D975 to confirm cetane improver dosage and cold flow behavior.
• Crude assay support: Pre-distillation density measurement of whole crudes and fractions for API gravity calculation and assay modeling.
• Contractual arbitration testing: Density determination for custody transfer of marine fuels (ISO 8217) and pipeline-delivered products where referee methods are contractually mandated.
• Educational laboratories: Teaching core principles of hydrostatic buoyancy, thermal expansion compensation, and standardized test method execution.

FAQ

Does the PLD-1884B include a glass hydrometer?
No—the instrument is supplied without hydrometers. Users must select and calibrate ASTM D1298-compliant glass hydrometers (e.g., ASTM 160 series) appropriate for their sample density range.
Can it be used for biodiesel (B100) density testing?
Yes—provided the sample is pre-filtered to remove particulates and maintained within the instrument’s viscosity and temperature limits; B100 testing complies with ASTM D6751 Annex A1.
Is external calibration certification provided?
The unit ships with a factory calibration report for the PT100 temperature sensor (traceable to NIM, China); end-user calibration of the bath against a reference thermometer is recommended per ISO/IEC 17025 Clause 6.5.
What safety certifications does it hold?
It conforms to IEC 61010-1:2010 for electrical safety in laboratory equipment and carries CCC marking for domestic use in China; CE marking is available upon configuration for EU export.
Is the bath volume customizable?
Standard bath capacity is 18 L; custom volumes (12 L or 25 L) are available under OEM agreement with revised thermal mass modeling and control tuning.