Shinwa SDM-72 Ferrous Particle Concentration Analyzer

Overview

The Shinwa SDM-72 Ferrous Particle Concentration Analyzer is a portable, field-deployable instrument engineered for rapid, quantitative assessment of ferrous wear debris concentration in lubricating oils and greases. It operates on the magnetic balance electromagnetic induction principle: ferrous particles suspended in the sampled lubricant perturb a calibrated magnetic field generated by an internal coil assembly; the resulting change in inductance is linearly correlated to mass concentration (w/w %). This method delivers direct, non-destructive quantification without solvent extraction, centrifugation, or filtration—enabling immediate on-site diagnostics prior to advanced vibration or thermographic anomalies. Designed specifically for predictive maintenance programs, the SDM-72 targets early-stage bearing and gear train degradation, supporting condition-based monitoring strategies aligned with ISO 17359 and ASTM D7684 (Standard Practice for Analysis of Wear Debris in Lubricants).

Key Features

• Portable handheld form factor (500 g) with ergonomic design for one-handed operation in confined machinery spaces.
• Automatic zero-point calibration before each measurement ensures baseline stability across temperature fluctuations and battery voltage drift.
• High-resolution detection down to 0.001 % (w/w), sufficient to identify incipient wear in rolling-element bearings per OEM lubrication guidelines (e.g., SKF, NSK).
• Minimal sample requirement (~0.8 mL) reduces contamination risk and enables repeated sampling from the same sump without significant fluid loss.
• Dual power configuration: long-duration field use via four standard AA alkaline cells (≈30 h continuous operation) or uninterrupted lab/depot operation with optional AC adapter.
• Ruggedized housing and integrated carrying case meet IP54-rated ingress protection for dust and splash resistance in industrial environments.

Sample Compatibility & Compliance

The SDM-72 is validated for use with mineral-based, synthetic, and semi-synthetic lubricants commonly employed in rotating equipment—including turbine oils, hydraulic fluids, gear oils (ISO VG 32–680), and multipurpose greases. It is not intended for use with non-ferrous particle suspensions (e.g., copper, aluminum) or highly viscous (>1000 cSt at 40 °C) or water-contaminated samples (>5 % H₂O), as these may affect magnetic permeability and induce measurement bias. The analyzer complies with IEC 61000-6-2 (EMC immunity) and IEC 61000-6-3 (EMC emission) standards. While not a GLP/GMP-regulated analytical instrument per se, its automatic zeroing, fixed geometry sensor cell, and traceable calibration protocol support data integrity requirements under ISO 55001 asset management frameworks.

Software & Data Management

The SDM-72 operates as a standalone, firmware-controlled device with no embedded memory or USB interface. All measurements are displayed in real time on a high-contrast LCD screen and must be manually recorded for trend analysis. For integration into digital maintenance platforms (e.g., CMMS, EAM), users export values via handwritten logs or third-party mobile capture tools. Though it lacks native FDA 21 CFR Part 11-compliant audit trails or electronic signatures, its deterministic analog-to-digital conversion architecture and absence of user-adjustable calibration parameters ensure measurement reproducibility—a prerequisite for ISO/IEC 17025-accredited laboratories performing supplementary ferrographic validation.

Applications

• Preventive diagnosis of rolling-element bearing wear in electric motors, pumps, compressors, and conveyors.
• Trend-based lubricant health monitoring during routine oil sampling intervals (e.g., quarterly or per OEM service schedules).
• Correlation with SOAP (Spectrometric Oil Analysis Program) and PQ Index results to distinguish mechanical wear modes (e.g., sliding vs. fatigue wear).
• Field verification of filter efficiency in offline filtration systems by comparing upstream/downstream iron concentration.
• Baseline establishment for new equipment commissioning and subsequent deviation tracking over service life.

FAQ

Does the SDM-72 require periodic recalibration by an accredited lab?
No. The instrument performs automatic zero adjustment before each test and contains no field-serviceable calibration components. Users should verify functionality using certified reference oil standards (e.g., ASTM D7690 traceable ferrofluids) annually or after physical impact.
Can the SDM-72 differentiate between particle size distributions?
No. It reports total ferrous mass concentration only and does not resolve particle morphology or size bands. For size-resolved analysis, complementary techniques such as analytical ferrography (ASTM D7690) or laser diffraction are required.
Is the sampling sleeve reusable?
No. Each polypropylene sampling sleeve is single-use to prevent cross-contamination between units and ensure consistent magnetic path geometry. Ten sleeves are included with the base unit.
What environmental conditions limit measurement accuracy?
Operation outside 0–40 °C ambient range may cause thermal drift in coil inductance and battery output voltage, leading to systematic offset. Strong external magnetic fields (e.g., near transformers or MRI units) must be avoided during measurement.