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5 | Measurement Basics
G 1610
18 / 26
B-H86.0.2X.DK2-3.0
Required material:
• Filling pipette
• Electrolyte KOH
• Flat blade screw driver
• Paper towel
• Polishing foil (pink)
• Suitable gloves *), Safety goggles
• Wash basin
• eventually spare membrane head GWOK 02
Procedure:
First the membrane head is unscrewed and the old electrolyte is removed.
If the membrane is undamaged and free of deposits, the membrane head can be used
again.
The platinum electrode must be bright and free of deposits!
• Unscrew the membrane head and the refill opening - Attention! Old electrolyte will
now leak out!
• Wipe off existing deposits from the platinum electrode with a cloth, if necessary
polish the electrode using the pink polishing foil.
• Check membrane head GWOK 02: is it in good state? Is Membrane undamaged?
• Open filling screw
• Fill pipette with KOH
• First fill the membrane head up to ¾ of its height, screw on membrane head tight-
ly, rinse excess KOH with water.
• Then carefully fill the sensor, try to flick at the shaft from time to time, helping air
bubbles coming out. In sum the sensor filling takes around 5 ml.
• If there are no more air bubbles and the filling hole is full, close with filling screw.
• Rinse excess KOH with water
• Turn sensor upwards: Are air bubbles visible below the membrane? If so: Refill
once again.
• Wait approximately 2 hours for the sensor to stabilize, afterwards calibrate the
sensor
– the electrode state evaluation should deliver 100%.
*) suitable gloves: Acc. to DIN EN 420, e.g. natural latex, natural rubber, butyl
rubber, nitrile rubber, polychloroprene, fluorinated rubber