AZI Sales/Customer Service 800-528-7411 or 602-470-1414 or support@azic.com Page 48 of 105
The available options are:
• SAMPLE SIZE – Set as discussed above.
• SAMPLE WINDOW – Set the allowable sample size tolerance. A smaller tolerance
produces more repeatable results, but makes it more difficult to load a sample.
Generally, pick a window size ≤ 10% of SAMPLE SIZE and less than 1g.
• INSIDE LIMITS AND OUTSIDE LIMITS - Selections of no sound, one beep, two
beeps or three beeps may be programmed to have the instrument indicate when the
weight of the sample is inside or outside the sample weight tolerance.
Each particular sample will have its own optimum sample size. Best results will be
obtained if the sample consists of a single layer of particles, as long as this is sufficient to
develop a weight loss of 10 milligrams or more. A good rule of thumb is "the lower the
moisture, the larger the sample."
A larger absolute weight change between the initial and final sample weights gives more
accurate, repeatable results, but a smaller sample size gives faster tests. Generally, it is
best to use a thin layer of sample that just covers the surface of the pan. Very light, or
very expensive, test materials may necessitate weighing as little as 150 milligrams. (With
a sample size of 0.2g and a sample window of 0.1g, samples as small as 0.1g can be
tested.) Note, however, that the standard error will be larger for samples this small,
unless the moisture content is sufficient to cause a weight change of at least 10 milligrams
for each test. If the first result is too low, increase the sample size or raise the
temperature. If it is too high, decrease the sample size or lower the temperature.
General recommended sample sizes are as follows:
• High volatile materials, such as coatings, typically require a smaller 1 to 3g sample.
Larger samples can be used to increase accuracy, but test times will increase.
• Materials that are 2% to 98% moisture typically require around a 5g sample.
• Low moisture materials (< 2%) require around a 10g sample.
• Ultra-low moisture materials (< 0.1%), such as plastic resins, typically require larger
sample sizes. The instrument is optimized for ultra-low moisture testing with a 30g
sample size.
Contact your AZI technical sales representative for assistance with appropriate sample
sizes.
To Next Page
Loading...
Need help?
General
