PerkinElmer OilExpress 4, User Manual

Page: 15 / 152

Introduction . 15
Quantitative calibrations and additional analytes
It is possible to develop quantitative calibrations for certain analytes, although their validity
may be limited to the type of oil used to develop the calibration. As an example, soot may be
determined directly as a percentage of the oil mass. In some cases, particularly for marine
oils with high concentrations of basic additives, it is possible to measure total base number
(TBN), provided an appropriate calibration is developed
5
. If the appropriate software package
is purchased and calibrations developed, your method can be configured to perform these
analyses.
The standard methods shipped with OilExpress 4 do not present results in terms of analyte
concentrations. Rather, they are expressed in terms of absorbance, usually in units of
absorbance per centimeter. The numerical values do not in themselves provide direct
information about the quality of the oil but must be interpreted in the context of an existing
body of data for that oil type.
References
1. ASTM E2412-10 “Standard Practice for Condition Monitoring of Used Lubricants by
Trend Analysis Using Fourier Transform Infrared (FT-IR) Spectrometry”,
ASTM
International
, 2010. http://www.astm.org/Standards/E2412.htm
2. ASTM D7412-09 “Standard Test Method for Condition Monitoring of Phosphate Antiwear
Additives in In-Service Petroleum and Hydrocarbon Based Lubricants by Trend Analysis
Using Fourier Transform Infrared (FT-IR) Spectrometry”,
ASTM International
, 2009.
http://www.astm.org/Standards/D7412.htm
3. ASTM D7414-09 “Standard Test Method for Condition Monitoring of Oxidation in In-
Service Petroleum and Hydrocarbon Based Lubricants by Trend Analysis Using Fourier
Transform Infrared (FT-IR) Spectrometry”,
ASTM International
, 2009.
http://www.astm.org/Standards/D7414.htm
4. ASTM D7415-09 “Standard Test Method for Condition Monitoring of Sulfate By-Products
in In-Service Petroleum and Hydrocarbon Based Lubricants by Trend Analysis Using
Fourier Transform Infrared (FT-IR) Spectrometry”,
ASTM International
, 2009.
http://www.astm.org/Standards/D7415.htm
5. David Wooton, Stuart Barry, Samuel White and Robert Thomas, “Using Infrared
Spectroscopy in Used Engine Oils: Estimating Base Number”,
Practicing Oil Analysis
,
November–December 2005.
6. ASTM D7418-07 “Standard Practice for Set-UP and Operation of Fourier Transform
infrared (FT-IR) Spectrometers for In-Service Oil Condition Monitoring”,
ASTM
International
, 2007. http://www.astm.org/Standards/D7418.htm