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AZI Customer Service 800-528-7411 or 602-470-1414 Page 25 of 92
Temperatures
This menu gives access to three temperature parameters, an oven stable indication,
an ashing moisture rate control parameter, and an enable switch used during a test.
Test Temperature - The
current temperature setpoint is
displayed to the right of TEST
TEMPERATURE. Press
[ENT] and the cursor will be
positioned at the left most
significant digit. Use the
number keys to enter the
desired test temperature.
When finished, press [ENT] to
stop editing and save the new
figure or [ESC] to cancel the
change.
Test HiStart Temperature – When active, the HiStart temperature is used at
the start of the test, and the test continues at that temperature until the rate of
moisture loss falls to half of its peak value. The heater then changes to the Test
temperature for the remainder of the test. This shortens a long test and may be
useful for tests > 15 minutes. When used, try a HiStart temperature 25ºC
above the Test temperature. To deactivate the HiStart feature, set the HiStart
temperature to 25ºC.
Idle Temperature - The temperature that is maintained by the instrument
between tests. This speeds testing, by decreasing the time required to heat the
sample chamber at the beginning of the test. It can save 10 to 120 seconds of
test time if properly used. A common idle temperature value is 50ºC or 80ºC for
most products. For plastics, a 100ºC idle is desirable. For ashing, a 100ºC idle
may be desirable to reduce time between tests. Any value between room
temperature and 300º
C can be used. Experiment to see what value is best for
your application. Too high a value will cause low results because the sample is
evaporating while the basis weight is being measured at the beginning of the
test.
Temp Rate - The temperature is controlled to the specified rate while ramping
to the setpoint. Set to 0 to disable. Do not use this in conjunction with ash rate.
Chamber Stabilization - When a number other than zero is entered, a
chamber stability warning will appear at the bottom of the Main Test Screen.
Although this function will not prevent tests from being run, the results from
extremely low/high moisture samples will be improved if the test is not started
until the display indicates “CHAMBER STABLE”. For ultra low moisture samples,
5-minute stabilization will help repeatability. For ultra low ash samples,
10-minute stabilization will help repeatability.
TEMP RATE MUST NOT BE USED AT ASHING TEMPERATURES BECAUSE
IT WILL NOT PREVENT SAMPLE IGNITION AND HEATER DAMAGE CAN
RESULT. INSTEAD, USE ASH RATE TO PREVENT SAMPLE IGNITION.