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AZI Customer Service 800-528-7411 or 602-470-1414 Page 30 of 92
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.
Tare Options
Two tare options define how stable the
balance must be before a test will
start. The third tare option is labeled
Special Options and is used to tare a
syringe, foil tray or other lightweight
device used to carry or hold the
sample on the pan.
Pan Tare – Records the
average empty pan weight after
ensuring that its weight is sufficiently stable over a programmable period of
time. Taring continues until the weight is found stable (≤ 0.2mg deviation) over
the programmable period of time. Temperature fluctuations occur in the test
chamber, dependent on a number of different criteria such as previous test
temperature, the amount of cool down time between tests, and the current idle
temperature. The temperature fluctuations cause the balance readings to drift
during taring and are reflected as an error in the final value. Because the
conditions that cause the temperature fluctuations are not always constant, the
error often appears as a higher standard deviation for a series of tests on a
particular sample.
The Pan Tare option has four (4) user selections to adjust the relationship
between tare time and tare error to improve overall operation for a given
product or purpose. The following table summarizes the menu choices and the
parameters associated with each choice.
MENU
CHOICE
MINIMUM TARE
TIME
FAST
6 seconds
STANDARD
8 seconds
LOW MOISTURE
10 seconds
ULTRA-LOW
MOISTURE
12 seconds
The ULTRA-LOW MOISTURE option should be used for samples with
moisture/solids/ash content between 0.005 and 0.2 percent. This option may
be used to improve accuracy for samples with moisture content in excess of 0.2
percent but will increase the overall testing time.