ASTM D7624 Standard Test Method for Condition Monitoring of Nitration in In-Service Petroleum and Hydrocarbon-Based Lubricants by Trend Analysis Using Fourier Transform Infrared (FT-IR) Spectrometry
7. Apparatus
7.1 Fourier transform infrared spectrometer equipped with sample cell, filter (optional), and pumping system (optional) as specified in Practice D7418.
7.2 FT-IR Spectral Acquisition Parameters - Set FT-IR spectral acquisition parameters according to instructions in Practice D7418.
8. Sampling
8.1 Obtain a sample of the in-service oil and a sample of the reference oil (required only for differential trend analysis) according to the protocol described in Practice D7418.
9. Preparation of Apparatus
9.1 Rinse, flush, and clean the sample cell, inlet lines, and inlet filter according to instructions in Practice D7418.
9.2 Monitor cell pathlength as specified in Practice D7418.
