Chlorine Sensor - ECD FCA-22 Instruction Manual

#6 Accept the Calibration
Accept the calibration by
pressing the Menu Select
down key. Cal mV indicates
the sensors output in 7
buffer.
#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.
#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.
#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.
Chlorine Calibration
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 potential.
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.
The primary calibration is an adjustment of the slope of the sensor, mV/ppm Cl
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.
#7 Move to Second Buffer
Press Menu Select
Down button twice.
#9 Adjust Buffer Value
Use the horizontal
CALIBRATE key to select the
digit to be adjusted.
#11 Adjust Buffer Value
Use the vertical CALIBRATE
key to adjust the value
#13 Return to the Home
Screen
Leave the Calibration
Screen and return to the
Home Screen by pressing
the CALIBRATE down key.
Page 10
FCA‐22 Instruction Manual
. The amperometric FCS
2