Metrohm NH3-selective electrodes - Manual (Page 13)

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4 Assembling the electrode
NH
3
-selective electrodes
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8 Check once again to ensure that the visible part of the membrane
lies taut and wrinkle-free above the opening.
Preparing the electrode for use
CAUTION
The membrane of the membrane module may not come into contact
with fingers or with other objects under any circumstances. The water-
repellent effect of the membrane would otherwise be reduced as a
result.
Electrode 6.0506.100 and 6.0506.150
1 Fill the membrane module with 2 mL of the measuring electrolyte
(6.2316.030).
2 Remove the measuring electrode from the electrode carrier and rinse
with distilled water.
3 Introduce the measuring electrode into the membrane module and
screw both parts together.
4 Prior to initial use, shake the assembled NH
3
-selective electrode sev-
eral times as you would a fever thermometer in order to remove any
air bubbles from the membrane.
5 Before making the first measurement, condition the electrode for at
least 10 minutes in distilled water.