Page 27
13.
RUNNING MOISTURE TESTS USING UNSEALED BOTTLES
Tare a clean, empty sample bottle, including the septum and cap.
Based on the expected moisture content of the sample, determine optimum sample size using the
chart on page 26. However, do not fill the bottle over ½ full so that sufficient carrier gas may
flow and pick up evolved moisture.
ENSURE that the smooth, slick side of the septum is to the inside of the bottle.
Weigh the loaded bottle and record the weight of the sample.
TIP - The accessory balance, AZI P/N Y990-0082, eliminates possible transcription errors
when entering the sample weight. It is also faster than manually taring and weighing the
sample.
Press
[START]
.
When prompted, enter the net sample weight and insert the bottle. The system will purge the
bottle for a pre-determined amount of time. The sensor will again zero and the test will begin.
•
For some applications, this bottle purge time may need to be reduced. If the expected
results are not obtained after other parameters are adjusted, call AZI Customer
Service at 800-528-7411 or 602-470-1414 for advice on how to reduce bottle purge
time.
•
An audible ‘beep’ will sound when the instrument has completed the test. Use the
table on page 26 and the FINAL moisture reading on the display to adjust the sample
size to optimize test time, repeatability, and accuracy.
RUNNING LYOPHILIZED MOISTURE TESTS
The Computrac
®
VAPOR PRO
®
Rx
has 102 available positions to store test parameters for
different materials. Storing the parameters ensures that each test of the same material will use
the same parameters to assure accurate, reliable, and repeatable testing.
Weigh the sealed bottle and record the weight of the
sample.
Press
[START]
.
When prompted, enter the sealed bottler weight and insert
the bottle. Hold lever down, position bottle between
wires, release lever.
A beep will be heard when the test is complete.
