FCA‐22InstructionManual
Page18
Maintenance
FreeChlorineSensor
Check the measurement at regular intervals, at least once a month.If the membrane is visibly soiled
clean it with a jet of water or a dilute HCl solution between 1‐5%. Do not clean with detergents or
solventsthatwouldreducethesurfacetensionofthemembran
e.
ReplacingtheMembrane(PN1000238)
Replace the membrane if heavily soiled or torn.First
unscrew the measuring chamber andthenunscrewthe
membranecap.(Seefigure5.1)
Remove the membrane from the cap, replace the
membrane and reinstall the cap on the measuring
chamber. Finally Refill the measuring chamber as
describe
dbelow.
RefillingtheSensor
Refill the sensor with electrolyte once a year orsooner
dependingonthechlorinelevelmeasured.Refillevery6
months for levels between 10 – 20 ppm and at every
membranechange.
Unscrew the measuring chamber from the sensor and
pouroutthespentsolution.
Fill the chamber to approximately 1 cm from the top
andtapitge
ntlytodislodgeanytrappedbubblesinside
thechamber.
Screw the measuring chamber vertically back onto the
sensor ensuring all air inside the chamber is displaced
withliquid.
When the o‐ring begins to seal continue slowly
tighteningunt
ilthestop.
The sensor is ready to use, re‐polarize the sensor for 60
minutesandrecalibrate asdescri bedabove.
Storage
The method for Storage of the sensor is dependent on
time.
Forshorttermstorageofseveralweeksthesensorcanbestoredfilledinsidetheyellowprotectivecap
aslong asthemem
braneisnot allowedto dehydrate. Makesurethespongeinsidethe capiswetted.
For longer terms rinse out the electrolyte with distilled water and allow the sensor to dry. Loosely
reassemblethedrysensorsoasnottotensionthemembraneduringstorage.
1. MeasuringChamber
2. Membrane
3. MembraneCap
Figure5.1
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