Sample requirements, Measurement – Hach-Lange PHC108 User Manual
Page 4
6. Push Read. Wait
until the reading
stabilizes.
7. Do steps 4–6
again to collect the
minimum number of
calibration points
specified in the
calibration options.
8. Push Done to view
the calibration
summary.
Note: The display will
not show "Done" until
the minimum number
of calibration points is
collected.
9. Push Store to
accept the calibration
and go back to the
measurement mode.
Sample requirements
N O T I C E
Some probes are not compatible with specific sample types. Probe damage can occur.
•
Do not use the probe in applications where must apply pressure to introduce the
probe into the sample (e.g., solids, viscous samples, samples containing solids, etc.).
For these applications, it is necessary to first open a path with a stainless steel
perforator before inserting the probe.
•
Do not use the probe in puncture applications where glass is not permitted.
•
Probes with an Ag/AgCl reference system and a single junction are not compatible
with solutions that contain silver complexing or binding agents (e.g., TRIS, proteins
and sulfides). To measure in these solutions, use a double junction probe, a probe
with an Ag
+
(silver ion) barrier or a Red Rod
*
probe.
•
Proteins can collect on the sensing element. Make sure that the probe stays clean
when these types of samples are measured.
•
Do not use the probe in solutions that are out of the temperature range of the probe.
Refer to
•
For low ionic strength (LIS) or high purity samples, use an LIS chamber or a flow cell
to prevent sample contamination.
Measurement
Before measurement:
The probe must have the correct service-life time stamp. Set the date and the time in the meter before the probe is attached.
If the complete traceability is necessary, enter a sample ID and an operator ID before the measurement. Refer to the HQd
meter manual for more information.
A regular calibration is necessary for the best measurement accuracy (refer to
on page 3).
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 is only
stored when Store is pushed.
*
Radiometer Analytical’s Red Rod technology: Encapsulation of reference elements with a red protection tube.
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