Metrohm NH3-selective electrodes - Manual (Page 12)

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6 ￭￭￭￭￭￭￭￭
NH
3
-selective electrodes
4 Place the membrane on the screw thread of the membrane module
and use your thumb to hold it in place.
5 Place the membrane carefully lengthwise over the opening of the
screw thread.
NOTE
The part of the membrane which lies above the opening of the
screw thread may not come into contact with fingers or other
objects under any circumstances. The water-repellent effect of the
membrane would otherwise be reduced as a result.
6 Pull the membrane slightly at its sides and press it firmly against the
screw thread.
The membrane must lie taut and wrinkle-free above the opening.
7 Screw the cover on the membrane module over the taut membrane.