86
87
• At the conclusion of the test period the results will be displayed.
• The user may View the results as a report. Press
.
• A copy of the sample results may also be saved. Press
.
This may be printed using
HI 92000
software.
Stage 2
- this is an off-line test.
To perform this test:
• Store the water sample in an enclosed clean container that
has been rinsed previously with water of the same quality.
• Adjust the sample’s temperature to 25 °C and agitate the
sample to ensure that it has equilibrated with ambient CO
2
.
• If the measured conductivity is less than 2.1 µS/cm, then the
sample has met the USP requirements.
• Otherwise, proceed to Stage 3 testing.
Stage 2
steps:
Note:
A temperature bath at 25.0 ±1 °C is required for this
measurement.
• Press
from the keypad.
• An instruction prompt will pop up with instructions for sample
preparation.
• Using measurement technique outlined in direct measurement,
place probe into sample.
• Press
.
• The meter will begin to evaluate stability of the conductivity
measurement. At the conclusion of the test period the results
will be displayed. If the sample has passed the evaluation
the testing is finished and the water may be used.
• Press
to store a copy of the sample results. This may
be printed using
HI 92000
software.
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.
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.
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2
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3
This USP standard consists of three stages (one in-line and two off-line tests) as followings:
Stage 1
- this is an in-line test.
The procedure follows:
• Measure the temperature of the water and the absolute
conductivity readings. The measurement must be on in-line
measurement. Results may be verified using a laboratory
method.
• The temperature should be rounded down to the nearest 5 °C.
Look up the corresponding conductivity value in the table
below.
• If the measured conductivity is lower than the conductivity in
the table, then the water meets the USP requirements.
• Otherwise, proceed to Stage 2 testing.
Stage 1
steps:
Press
from the keypad.
• An instruction prompt will pop up.
• Using measurement technique outlined in direct measurement,
place probe into sample.
• Press
.
• The user may Edit the USP factor (to provide a margin of error)
or compare measurement results directly to the standard (100%).
“
Please wait ...
” will appear on display and the measurement
is compared to the standard values.
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