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CALIBRATION MESSAGES
•
Wrong standard solution. Check the standard solution.
This message appears when the difference
between the reading and the value of the selected standard is significant. If this message is displayed,
check if you have selected the appropriate calibration standard.
•
Wrong standard temperature.
This message appears if the standard temperature is out of the
allowable standard temperature range (0 - 60 °C)
.
•
The current range was already calibrated. Change the standard solution.
The calibration for this
conductivity range was already done. Please change the standard.
•
Press <Clear Offset> to clear old calibration.
Clear the offset of the electrode calibration.
•
Press <Clear Cal> to clear old calibration.
Clear all old calibrated standards.
CONDUCTIVITY MEASUREMENT
DIRECT/AUTOHOLD MEASUREMENT
To measure conductivity of a sample using the Direct/AutoHold
reading mode:
• Follow sample and probe directions found under
Direct
Measurement
.
• Select the
Direct/AutoHold
reading mode (see
Conductivity
Setup
).
• If pressing
, the “
AutoHold
” indicator will start
blinking on the display until the stability criterion is reached.
The conductivity value will be frozen on the display, along
with “
AutoHold
” indicator.
• To return to normal measure mode press
.
Make sure the instrument has been calibrated before taking conductivity measurements.
DIRECT MEASUREMENT
To measure the conductivity of a sample using the Direct reading mode:
• Highlight Channel 2 and press
and then
to
select conductivity measure mode.
• Select the
Direct
reading mode (see
Conductivity
Setup
).
• The conductivity probe should be rinsed with deionized water.
• Shake off excess water.
• If possible rinse probe with a sample of solution to be tested.
Swirl and raise and lower probe in this rinse solution.
• Insert probe in center of a beaker with the sample, away
from the wall or bottom of beaker. The upper vent holes must
be covered with solution.
• Gently stir solution and wait for probe to reach thermal
equilibrium with the sample.
• Tap probe repeatedly to dislodge any air bubbles that may be trapped inside the sleeve. Allow time for
the reading to stabilize.
• The measured conductivity value will be displayed on the Channel 2 screen.
The United States Pharmacopoeia Regulations establishes limits
and calibration requirements for WFI (Water For Injection). The
HI 5521
and
HI 5522
meters contains both conductivity and pH
measurements that are needed for off line measurements in a Stage
2 and 3 of the regulation. Stage 1 verification may be carried out in
a container but the regulation requires an in-line measurement. The
meter provides prompts and instructions to make the measurements
easily. Calibrate a pH sensor on Channel 1 and EC probe on Channel 2 prior
to storing USP analysis.
To access the USP menu:
• Highlight Channel 2 and select
from the basic
display to select
.
• Press
then
.
• Select the
Direct/USP
reading mode (see
Conductivity
Setup
).
• Return to measure mode by pressing
.
• Verify conductivity probe has been calibrated in conductivity
standards in the lowest measurement range.
• Press
and then select the desired USP stage.
In this measure mode the user can check for water quality using
the United States Pharmacopeia standard (USP <645>) guidelines
for water for injection.
USP EVALUATION
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