Measurement – Hach-Lange PHC805 User Manual User Manual
Page 5
•
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.
•
Air bubbles under the sensor tip can cause a slow response or an error in the
measurement. If there are bubbles under the sensor tip, carefully shake the probe to
remove the bubbles.
•
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.
•
Do not put the probe on the bottom or sides of the container.
•
Make sure that the filling hole is open and above the sample solution level.
•
Use a laboratory stirrer or shake the probe from side to side in the solution to refresh
the reference junction.
•
The meter display shows "Stabilizing" and a progress bar as the probe stabilizes in
the sample. The display shows the lock icon when the measurement is stable.
•
If a measurement error occurs, refer to
on page 12.
Measurement procedure:
*
Radiometer Analytical’s Red Rod technology: Encapsulation of reference elements with a red protection tube.
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