Conditioning, Calibration, Measurement - Xylem WTW CN 500 DIN Instrucciones De Operación

CN 500 / CN 800
General
information
Before measuring
ba15356e03 03/2015

Conditioning, calibration, measurement

CN 800
When operating the electrode ensure that
 the filling opening (1) for the bridge electrolyte is open
 the inner junctions (3) 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 im-
mersion
Maximum depth of im-
mersion
1 Condition every ion sensitive electrode in standard solution before
using it. To achieve a good responding behavior, the concentration
of the standard solution should be similar to the concentration ex-
pected of the test sample.
2 Remove any air bubbles in the bridge electrolyte by slightly knocking
against the shaft.
3 Calibrate according to the operating manual of the meter and the
analysis specification.
The conditioning time depends on the previous history of the ion sensitive
electrode. Connect the electrode(s) to the meter and switch to the measured
value display (see operating manual of the meter). The ion sensitive elec-
trode is sufficiently conditioned when the measured value no longer changes
considerably under otherwise constant conditions (temperature, composition
of the solution).
NOTE
Avoid measuring samples with cyanide concentrations of more than
Conditioning, calibration, measurement
R 503 + CN 500
1
2
3
4
The ground junction (4) must be covered
Approx. 1 cm below the fluid level (2) of the
bridge electrolyte
21