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8. SODIUM TARTRATE TEST
The (Factory) TARTRATE test verifies the heater and force balance operation, and can
also be used to familiarize oneself with the instrument and test procedure.
Sodium tartrate dihydrate is a chemical with a known moisture concentration that
releases moisture at temperatures greater than 120 ºC. Because of its consistent
moisture concentration, sodium tartrate is used as a standard in moisture measurement
using oven or titration methods.
To obtain consistently reliable results, use a high quality or reagent grade (ACS certified)
granular sodium tartrate. Sift the sodium tartrate through a #20 sieve to obtain a more
uniform size and produce better results. Lumps in sodium tartrate usually indicate
moisture absorption that will yield inconsistent results. Discard the larger chunks, or
pestle them through the sieve and return them to the bottle. Sodium tartrate (AZI P/N:
800-0037) is available from AZI consumable parts sales.
See section 5.1 Performing a Test on page 16 and select (Factory) TARTRATE as the
Test Program to perform the TARTRATE test. The Test Program is factory configured to
use approximately 8 grams of sample and run at 150 °C. Test Results should be within
a range of ±0.1 of the assayed value on the label of the chemical. Sodium tartrate
assayed moistures typically range from 15.61 - 15.71.
Discard the first test of the day for stability reasons.
If desired, perform the sodium tartrate test multiple times to determine the instrument’s
repeatability; this is a more critical verification of the instrument’s performance. Perform
five tests and then compute the mean, standard deviation, and relative standard deviation
(See section 6.2 Test Results on page 21).
If the results are out of tolerance, repeat the sodium tartrate testing again, and analyze
the results. If the results are still out of tolerance, call AZI Customer Service for
assistance.
9. ROUTINE MAINTENANCE
The MAX
®
4000 requires routine cleaning to keep the test chamber free of excess sample
material. Failure to keep the instrument interior clean reduces its accuracy and
repeatability, as sample material collecting in the test chamber prevents free movement
of the pan support. In addition, sample material collecting on the rim of the heater shroud
prevents the lid from closing completely, causing erratic results. Excess material may
also fall into the system's interior, causing balance problems. Routine cleaning of the test
chamber reduces the likelihood of problems and repairs, extending the life of the
instrument. Refer to the manual for complete details on instrument maintenance.
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