Sample measurement, Measurement notes, Measurement procedure – Hach-Lange PHC20103 User Manual User Manual
Page 4
Sample measurement
Before measurement:
The probe must have the correct service-life time stamp. Set the date and time in the meter before the probe is attached.
If complete traceability is necessary, enter a sample ID and operator ID before measurement. Refer to the HQd meter manual
for more information.
Regular calibration is required for the best measurement accuracy (refer to
on page 2).
Prepare the probe for use (refer to
Measurement notes
•
Data is automatically stored in the data log when Press to Read or Interval is selected
in the Measurement Mode. When Continuous is selected, data will only be stored when
Store is pushed.
•
Air bubbles under the sensor tip when submerged can cause slow response or error in
measurement. If bubbles are present, gently shake the probe until bubbles are removed.
•
If a measurement error occurs, refer to
on page 10.
Measurement procedure
1. Connect the
probe to the meter.
Make sure that the
cable locking nut is
securely
connected to the
meter. Turn the
meter on.
2. For the best
stabilization time,
condition the probe
for several minutes
in the sample or in
a solution
comparable to the
sample in terms of
pH and ionic
strength before the
initial sample
measurement.
3. Rinse the probe
with deionized
water, then with
the sample. Blot
dry with a lint-free
cloth.
4. Put the probe in
the sample and stir
gently. Make sure
that the reference
junction is
completely
submerged. Do not
put the probe on
the bottom or sides
of the container.
Shake the probe
from side to side in
the sample to
refresh the
reference junction.
5. Push
Read
.
The display will
show "Stabilizing"
and a progress bar
as the probe
stabilizes in the
sample. The
display will show
the lock icon when
the reading
stabilizes.
6. Repeat steps
3-5 for additional
measurements.
7. When
measurements are
done, store the
probe (refer to
on page 9).
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