Standard Test Method for Condition Monitoring of Soot in In-Service Lubricants by Trend Analysis using Fourier Transform Infrared (FT-IR) Spectrometry
Get more information about the standard at ASTM D7844-22a
ASTM D7844 is a standard test method for condition monitoring of soot in in-service lubricants by trend analysis using Fourier Transform Infrared (FT‑IR) spectrometry. Soot accumulation is a critical indicator of lubricant contamination, which can impair engine performance, increase wear, and cause filter blockages. This method offers a fast, practical way to assess lubricant condition in field environments, supporting maintenance decisions and machinery health monitoring.
Details
ASTM D7844 utilizes FT‑IR spectrometry to detect soot build‑up in lubricants – particularly in diesel crankcase engine oil – as a result of blow‑by or incomplete combustion. Samples are analyzed following Standard Practice D7418, collecting FT‑IR spectral data.
Industries & Applications
ASTM D7844 is commonly applied where in‑service monitoring of lubricant contamination is vital:
- Diesel engine maintenance and diagnostics: Detects soot contamination early to prevent accelerated wear, increased viscosity, and filter cloggingIndustrial machinery condition monitoring: Enables rapid, on-site assessment of lubricant health to inform maintenance planning
- Oil analysis laboratories and OEMs: Used to develop trend‑based maintenance protocols and detect abnormal lubricant behavior during machinery operation
- Comprehensive lubricant health assessment: Often combined with other FT‑IR methods for oxidation (D7414), sulfate derivatives (D7415), nitration (D7624), and additive depletion (D7412), as well as elemental wear analysis (D5185), to provide a holistic view of oil condition