SenTix
®
Technical data
5
ba75739e02
07/2013
Ground junction of
SenTix H and
SenTix HW
With the ground junction of the SenTix H and SenTix HW combination elec-
trodes, the electrode outflow can be adjusted with a thread:
Hold the combination electrode with the pH glass membrane pointing
downward. Using the provided special wrench, open the ground junction
until some electrolyte solution can be seen to come out of the junction and
all ground surfaces are completely moist.
Carefully and using little power close the junction until the contact between
the rough ground surfaces can be noticed as a resistance. The combina-
tion electrode is now ready to measure.
Caution: Always use very little power to close the junction so the
ground surfaces are not damaged!
The ground junction can be opened further so that more electrolyte solu-
tion comes out.
Calibration
and measurement:
General rules
Make sure the refilling opening for the reference electrolyte solution is
open.
Avoid the displacement of any solution (sample or buffer solution) from
one measurement to the next by taking the following measures:
– Shortly rinse the calibration and sample beakers with the solution the
beakers are to be filled with next.
– Between measurements, rinse the combination electrode with the so-
lution that follows. Alternatively, you can also rinse the combination
electrode with deionized water and then carefully dab it dry.
Immerse the combination electrode in the solution in a vertical or slightly
tilted position.
Make sure the immersion depth is correct. The ground junction must be
completely submersed in the solution. At the same time, the level of the
reference electrolyte must be at least 2 cm above the level of the solution.
Provide approximately the same stirring conditions for measuring as for
calibrating.
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