ECD FCA-22 - Chlorine Sensor

FCA‐22InstructionManual
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Page10
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#6AccepttheCalibration
Acceptthecalibrationby
pressingtheMenuSelect
downkey.CalmVindicates
thesensorsoutputin7
buffer.
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#7MovetoSecondBuffer
PressMenuSelect
Downbuttontwice.
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#8SlopeCalibration
Initiatethecalibrationby
simultaneouslypressing
thehorizontalCALIBRATE
keyswiththesensorina
10.00pHsolutionoradjust
toadifferentbuffer.
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#9AdjustBufferValue
Usethehorizontal
CALIBRATEkeytoselectthe
digittobeadjusted.
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 #10AdjustBufferValue
UsetheverticalCALIBRATE
keytoadjustthevalueand
thenusethehorizontal
CALIBRATEkeytoselect
thenextdigittobe
adjusted.
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#11AdjustBufferValue
UsetheverticalCALIBRATE
keytoadjustthevalue
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#12Acceptthe
Calibration
AccepttheCalibration
whentheCalValueis
stableforgreaterthan30
seconds.PressMenu
SelectDownbuttonto
accepttheCalibration.
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#13ReturntotheHome
Screen
LeavetheCalibration
Screenandreturntothe
HomeScreenbypressing
theCALIBRATEdownkey.
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ChlorineCalibration
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The Free Chlorine Sensor (FCS) zero point and the slope (sensitivity) were  calibrated at the factory
before shipping. Allow the FCA‐22 system to run for at least 1 hour before proceeding with the
calibrationcheck.Thispolarizationtimeisnecessaryforstablereadings andanaccuratezeropoten
tial.
Verify the displayed chlorine concentration agrees with the actual value.If further calibration is
necessary verify the temperature and pH readings are valid before beginning the standardizing
procedure.
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Theprimarycalibrationisanadjustmentoftheslopeofthesensor,mV/ppmCl
2
.Theampero metricFCS
generates a nA current proportional to the chlorine concentration which is sent to the chlorine  input 
card. The chlorine input card sends a millivolt signal to the C‐22 proportional to the chlorine
concentration.
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