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Sample Preparation

Proper product sampling and preparation are critical to achieving optimal accuracy and precision using an ORACLE.

Each sample has a unique composition, and therefore may require a unique preparation and application process.

Listed below guidelines to optimize every analysis.

Sampling

Proper sampling of any product type is necessary for a rapid analysis that accurately represents the entire

production batch or line. Many standard procedures have been developed specic to each sample type by various

agencies such as AOAC, USDA, or ASTM. Please reference each agency for the correct procedure before moving

forward with analysis on an ORACLE.

Preparation

Sample preparation should be practiced to ensure a homogeneous sample is being analyzed. As with any chemical

analysis, a homogeneous sample leads to a more representative test, and better results when comparing duplicate

results or reference chemistry.

Sample preparation can entail physical or chemical changes to the sample to improve analysis. If using a SMART

6, please contact the CEM Corporation Process Application group, or review the method note for the sample found

at www.cem.com/SMART_6/resource_library.

Weight

Consistent sample weight helps ensure precision and accuracy. While sample size can vary from 1.0 grams to 5.0

grams depending on the type of product being tested, repeatability within the same sample is important to avoid

burning or under-drying of a sample. All moisture methods, either using a SMART 6 or a reference analysis, List an

acceptable weight range that should be followed for every analysis to optimize results.

Glass Fiber Pads

The ORACLE uses CEM certied glass ber sample pads to assist in rapid and accurate testing. The pads are

specially designed to support the sample being tested without absorbing heat, but remaining porous enough to let

moisture freely evaporate.

• Liquid samples (typically above 25% moisture) typically use 2 glass ber sample pads to help retain heat

in the sample and avoid splattering during the heating process.

• Dry samples (typically under 25% moisture) only require a single glass ber sample pad for the analysis.

Trac Film

Every sample analyzed in the ORACLE must be wrapped in the proprietary Trac Film. The lm ensures that no

sample is lost during the sample preparation procedure outlined in the “Sample Preparation using the ORACLE

Station” section, as well as protects the ORACLE tubes from incurring buildup of fat or oil over time. The lm was

developed specically for this purpose, and is manufactured with materials that will not interfere with the NMR

process. Not using the Trac Film can lead to inaccurate results, as well as a voidance of the system’s warranty or

service contract.

CEM ORACLE Manual

Other manuals for CEM ORACLE