Brookfield FDH-3901 Grease Water Washout Tester

Overview

The Brookfield FDH-3901 Grease Water Washout Tester is an engineered laboratory instrument designed to quantify the resistance of lubricating greases to water-induced structural degradation under standardized dynamic conditions. It operates on the principle of accelerated water washout simulation—where a rotating bearing assembly, pre-packed with test grease, is subjected to a continuous, calibrated stream of deionized water at controlled temperature and flow rate. This methodology replicates real-world service environments where greases encounter moisture ingress, such as in wheel bearings, chassis components, or marine equipment. The test output—expressed as the mass percentage of grease washed away after a defined exposure period—is directly correlated to ASTM D1264, ISO 11007, and GB/T 3498 standards for grease water washout resistance. Its architecture integrates thermal, hydraulic, and mechanical subsystems into a single robust platform, enabling reproducible evaluation of grease formulation stability, thickener hydration resistance, and base oil–thickener compatibility.

Key Features

• PID-based digital temperature control system ensuring stable bath temperature from ambient to 100 °C with ±1 °C accuracy; real-time display of setpoint and actual bath temperature supports precise thermal calibration and drift correction.
• High-reliability magnetic-drive micro-circulation pump (imported) delivering consistent, low-noise water delivery over extended operational cycles—critical for multi-sample testing sequences requiring uninterrupted flow integrity.
• Motor-driven belt transmission mechanism coupled to a precision-machined ISO 204 deep groove ball bearing assembly, rotating at 600 ±30 rpm to simulate realistic shear loading during water exposure.
• Stainless steel water bath tank with corrosion-resistant finish ensures long-term dimensional stability and eliminates interference from metal ion leaching during repeated thermal cycling.
• Integrated flow regulation module maintains spray flux at 5.0 ±0.5 mL/s across all operating temperatures—validated via gravimetric flow calibration traceable to NIST-traceable volumetric standards.
• Compact, ergonomic enclosure with intuitive front-panel interface and fail-safe thermal cutoff protection complies with IEC 61010-1 safety requirements for laboratory electrical equipment.

Sample Compatibility & Compliance

The FDH-3901 accommodates standard ASTM D1264-compliant test specimens: 3.0 g ±0.1 g of grease uniformly packed into the inner raceway of the 204 bearing before mounting. It supports both NLGI Grade 00 through 3 greases, including lithium, calcium-sulfonate, polyurea, and clay-thickened formulations. All wetted components—including nozzle, bath liner, and bearing housing—are constructed from 316 stainless steel or PTFE-lined materials to prevent catalytic oxidation or hydrolytic decomposition of sensitive thickeners. The instrument meets essential requirements for GLP-compliant testing environments: full parameter logging (time-stamped temperature, flow, rotation), manual entry fields for operator ID and sample ID, and audit-ready operational records exportable via USB interface.

Software & Data Management

While the FDH-3901 operates as a standalone benchtop unit with embedded digital controls, it supports external data acquisition via RS-232 or optional USB-to-serial adapter. When interfaced with compliant laboratory information management systems (LIMS), it transmits timestamped sensor readings—including bath temperature, elapsed test duration, and cycle completion status—to central databases. All stored parameters are retained for ≥30 days onboard and may be exported in CSV format for statistical process control (SPC) analysis. The system design adheres to FDA 21 CFR Part 11 principles for electronic records: user authentication, operation logging, and non-erasable event history ensure traceability in regulated quality assurance workflows.

Applications

• Formulation development labs evaluating comparative water resistance of new grease thickeners or base oil blends.
• Quality control laboratories performing incoming raw material verification or batch release testing per ISO 2137 or DIN 51808-2 specifications.
• OEM technical centers assessing grease suitability for automotive wheel bearing applications exposed to road splash and high-humidity climates.
• Independent testing laboratories conducting third-party certification under API RP 541 or SAE J1577 protocols.
• Academic tribology research groups studying interfacial water adsorption kinetics on metallic surfaces coated with structured grease films.

FAQ

What standards does the FDH-3901 comply with?
ASTM D1264, ISO 11007, GB/T 3498, and DIN 51808-2.
Is calibration documentation provided with the instrument?
Yes—NIST-traceable calibration certificates for temperature sensor and flow meter are included upon shipment.
Can the instrument be used with non-aqueous test fluids?
No—the system is validated exclusively for deionized water per standard methods; alternate fluids require revalidation and are not supported under warranty.
What maintenance intervals are recommended for the magnetic drive pump?
Inspection every 500 hours of cumulative operation; replacement of pump head and seals advised at 2000-hour intervals.
Does the FDH-3901 support automated pass/fail decision logic?
No—it delivers quantitative mass-loss data only; pass/fail thresholds must be applied externally per organizational or specification-defined limits.