8.5. Retained Samples
The weight test and the sodium tartrate test are usually sufficient to satisfy industry guidelines for quality control in moisture measurement. Some additional checks can be performed using replicate testing of retained samples. Retained samples, when stored under airtight conditions, should maintain moisture levels for long periods. Routine testing of these samples should produce the same results day after day. Retained samples further verify the unit's operation on the customer's own product. If hygroscopic materials are used, the values can change with time and repeated opening of the container.
∙Set the MAX 5000XL to the optimum test temperature for the retained sample or use the ID number of a test that has been stored in memory.
∙Place a clean aluminum sample pan onto the pan support in the test chamber.
∙Close the lid and press [START].
∙When the “OPEN LID” display appears, GENTLY add the optimum amount of retained sample evenly across the sample pan.
∙Close the lid and allow the test to continue.
∙Record the result in the quality control log.
∙The results for the retained sample should fall within the established acceptable range of results for that sample. If results are out of range, repeat the test to verify results and/or perform standard reference testing to certify the percent moisture value.
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