daviteq A420-FCL User Manual page 4

Free chlorine sensor with analog output
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3.1. Electrode Assembly steps 1-8
1. Ensure you have the necessary components to assemble the
electrode
Internal Filled Gel (IFG)
Electrode & Membrane Cap
Protection Boot
Electrode polishing strips
2. Remove the protection boot from the electrode or membrane cap
3. Lift the silicone band covering the vent hole. Make sure the vent hole
(see arrow in image) is open to air. Avoid using any sharp tools for this
step. Set the membrane cap aside.
► Note:Avoid damaging the Silver Halide Coating(gray portion)
4. Polish the working electrode (WE) surface (see arrow) with the
polishing strip until it is shiny in appearance.
Polish the gold tip in one direction.
Do not over-polish – this should just take a few strokes on the
polishing strip
Avoid touching the silver halide coating
Rinse the electrode with DI water after polishing
5. Fill the membrane cap with Internal Filled Gel (IFG) to the upper
threads (red arrow).
► Note:DoNOTshaketheInternalFilledGel(IFG) before filling – this may
introduce problematic air bubbles.

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