Xylem ISE Electrodes I 60 - Handbuch (Seite 13)

13
Calibration
Calibrate according to the data given in the
operating manual of the measuring instrument 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.