Koehler K92095 Timken Extreme Pressure Tester
| Brand | Koehler |
|---|---|
| Origin | USA |
| Model | K92095 |
| Standard Compliance | ASTM D2509, ASTM D2782 |
| Rotational Speed Range | 100–800 rpm |
| Test Load Ramp Rate | 0.9–1.3 kg/s |
| Specimen Dimensions | 12.32 × 12.32 × 19.1 mm |
| Test Cup OD | 49.22 mm |
| Weight | 52 kg |
| Automatic Grease Feed Rate | 45 ± 10 g/min |
| Recirculating Fluid Reservoir Capacity | 3 L |
| Timer Range | 99 h : 59 min : 59 s |
| Loading Arm Ratio | 1:10 |
| Power Supply | 230 V, 50 Hz |
Overview
The Koehler K92095 Timken Extreme Pressure Tester is an engineered precision instrument designed to evaluate the load-carrying capacity and extreme pressure (EP) performance of lubricating greases and oils under controlled sliding contact conditions. Based on the standardized Timken test methodology—codified in ASTM D2509 for greases and ASTM D2782 for fluids—the instrument subjects a rotating steel cup against a stationary steel block under progressively increasing normal load. The test quantifies the maximum load (in kilograms) at which the lubricant prevents scoring or welding of the contacting surfaces, yielding the Timken OK Load value—a critical benchmark for industrial gear, bearing, and heavy-duty automotive applications.
Key Features
- Motor-driven rotational system with variable-frequency 2 HP motor enabling precise speed control from 100 to 800 rpm, ensuring repeatability across test protocols.
- High-stiffness, precision-machined frame with integrated axial mounting and spring-disk loading mechanism for consistent force transmission and minimal mechanical hysteresis.
- 1:10 mechanical loading arm equipped with calibrated load cell and digital force readout, delivering traceable, real-time normal load measurement with resolution suitable for regulatory documentation.
- Heated oil bath test platform maintains thermal stability during extended testing sequences, mitigating viscosity drift and supporting temperature-dependent EP evaluation per ASTM annexes.
- Automated grease feed system (45 ± 10 g/min) ensures uniform sample delivery to the contact zone, reducing operator variability and enhancing inter-laboratory reproducibility.
- Integrated recirculating fluid system (3 L reservoir) sustains consistent lubricant film renewal, critical for simulating dynamic service conditions in rolling element and plain bearings.
- Programmable digital timer (99 h : 59 min : 59 s) supports unattended operation and synchronized data logging for GLP-compliant test execution.
Sample Compatibility & Compliance
The K92095 accommodates standard Timken test specimens (12.32 × 12.32 × 19.1 mm rectangular blocks) and 49.22 mm OD steel test cups. It is validated for use with NLGI grade 00–3 greases, mineral and synthetic base oils, and formulated EP additives including sulfur-phosphorus compounds and metal sulfides. The instrument meets full conformance requirements of ASTM D2509 (Timken EP Test for Lubricating Greases) and ASTM D2782 (Timken EP Test for Lubricating Fluids). Its mechanical design, sensor calibration traceability (NIST-traceable certificate included), and documented uncertainty budget support audit readiness for ISO/IEC 17025-accredited laboratories and FDA-regulated manufacturing environments where lubricant qualification is part of equipment maintenance validation (e.g., 21 CFR Part 211).
Software & Data Management
While the base K92095 operates via front-panel digital controls and analog force readout, optional integration with the K92090-5 imaging module enables quantitative wear analysis. This add-on includes a calibrated stereo microscope, manual translation stage, and image acquisition software compliant with FDA 21 CFR Part 11 requirements—including electronic signatures, audit trail logging, and user access control. Raw load vs. time data can be exported via RS-232 or USB for post-processing in third-party statistical packages (e.g., JMP, Minitab) to generate Weibull failure distributions or perform ANOVA across formulation batches. All calibration records, maintenance logs, and test reports are structured to align with GLP documentation standards.
Applications
- Formulation screening of anti-wear and extreme pressure additives in R&D laboratories.
- Quality control release testing of finished greases prior to shipment to OEMs in automotive, wind turbine, and mining sectors.
- Root cause analysis of field failures linked to insufficient EP performance in slow-speed, high-torque gearboxes.
- Regulatory submission support for NSF H1 food-grade lubricants requiring documented EP capability under USDA/FDA guidelines.
- Comparative benchmarking against competitor products using standardized Timken OK Load thresholds.
- Validation of lubricant compatibility with new bearing alloys or surface treatments (e.g., nitrided steel, DLC coatings).
FAQ
What standards does the K92095 comply with?
ASTM D2509 (greases) and ASTM D2782 (fluids) are fully supported; instrument geometry, loading dynamics, and specimen dimensions conform to mandatory clauses in both methods.
Is calibration certification included?
Yes—each unit ships with a NIST-traceable calibration report covering load cell, rotational speed encoder, and timer accuracy, valid for 12 months from date of shipment.
Can the system operate continuously for multi-hour tests?
Yes—the 99-hour programmable timer, thermally stabilized test platform, and recirculating lubricant system enable uninterrupted operation under ASTM-defined test durations.
What maintenance is required between tests?
Standard procedure includes cleaning the test cup and block with solvent, inspecting for residual wear debris, verifying grease feed nozzle integrity, and confirming torque on loading arm fasteners per quarterly PM checklist.
Is the K92095 suitable for ISO/IEC 17025 accreditation?
Yes—its documented measurement uncertainty, defined calibration hierarchy, and support for procedural SOPs make it suitable for inclusion in accredited scope under ISO/IEC 17025:2017 Clause 6.4 (Equipment) and Clause 7.7 (Ensuring Validity of Results).
