Xylem ISE Electrodes Pb 60 - Handbuch (Seite 18)

18
The combination electrode is now ready to measure.
Calibration Calibrate according to the data given in the operating
manual of the measuring instrument and the analysis
specification.
When operating the electrode ensure that:
• the filling opening for the bridge electrolyte is open
• the inner junctions are covered with bridge electrolyte
• no air bubbles are in the bridge electrolyte
• the depth of immersion is within the optimum range:
Minimum depth of immersion:
The diaphragm must be covered
Maximum depth of immersion:
Approx. 1 cm below the fluid level of the bridge electrolyte
Before Measuring
• Before use, condition the combination electrode or
electrodes respectively for approx. 5 min. in standard
solution.
• Remove any air bubbles in the bridge electrolyte by
slightly knocking against the shaft.
• Calibrate according to the operating manual of the meter
and the analysis specification.
Sample preparation
Add 2 % ISA/FK solution. This sample conditioning solution
creates optimum conditions for measuring. It provides a
constant ionic strength and similar diffusion potentials at the
reference electrode in standard and test sample.
Note If you would like to have more detailed information
concerning sample preparation and measuring procedures,
SI Analytics provides a large number of application reports
for various applications.