1. Scope

Keywords

Rationale

Currently, there are no standard test methods for the FT-IR condition monitoring of water in in-service oils and lubricants, although water has been measured by FT-IR spectrometry for some time as one of the parameters specified in Standard Practice E2412, “Standard Practice for Condition Monitoring of Used Lubricants by Trend Analysis using Fourier Transform Infrared (FT-IR) Spectrometry.” Standard Practice E2412 provides a generalized, multi-parameter protocol for condition monitoring of in-service petroleum and ester lubricants by FT-IR spectroscopy and details a variety of acceptable instrument settings as well as parameters for different lubricant types. However, for an inter-laboratory cross-check program, specific instrument settings should be defined since different cell window materials, apodizations, background collection techniques, etc. will result in variations in the final spectrum obtained. Therefore, ASTM Standard Practice, D 7418, created using Standard Practice E 2412 as a guide, details specific instrument settings and FT-IR spectral acquisition protocols for in-service condition monitoring. This test method describes the measurement of water in in-service oils and lubricants employing the FT-IR spectral data acquired according to the protocol specified in Standard Practice D 7418 for both direct trending and differential approaches.