Xylem ISE Electrodes Br 60 - Handbuch (Seite 14)

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.
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.
Response times
The response time depends on the concentration range.
It is:
• several seconds with high concentrations,
• several minutes near the detection limit.
The measured value is stable if the value does not change
by more than 0.1 mV within 30 seconds.