24
463X Chlorine Systems Manual
Chlorine sensors need to be calibrated for accuracy.
Calibration must be done with every new sensor and
any time a membrane cap is replaced. After the 4 hour
conditioning period, Temperature Calibration and
In-Process Calibration needs to be performed. Any 4 to 20
mA or relay output devices should be of
fl
ine.
Chlorine Sensor Temperature Calibration
The temperature element inside the chlorine sensor needs
to be calibrated. Use a reference thermometer to verify
the actual temperature of the sample. This value is then
entered in Step 4 to calibrate the system. After completing
Temperature Calibration, proceed to In-Process Calibration,
page 25.
Tip:
Remove the pH electrode from the
fl
ow cell and insert
the reference thermometer. If no pH sensor is being used,
remove the cell plug to insert the thermometer. Replace the
plug after calibration.
Example: Set the calibrated temperature to 25.3 ºC.
1. Go to the Calibrate Menu.
2. Scroll down
▼
3 menus to the
Cl Temperature
menu.
3. Press
►
to enter Edit Mode.
4. Enter the temperature reading.
Example: 25.3
.
5. Press the Enter button to save the setting.
6. Exit to the View Menu.
E X A M P L E
E X A M P L E
Step 2
4
Cl Temperature
Calibration:
>
Cl Temp: Cal
+025.3 °C
Calibrate Menu
New temp. value
ENTER
ENTER
Lowest value noted for
Zero Cal.
Zero Cal: ppm&nA
0.20 / 001.0
Cl Zero:
Calibration
>
Calibrate Menu
Step 6
8
The signal level during a Zero Point
Calibration must be at least 1 nA lower
than the In-Process Calibration point.
E X A M P L E
ENTER
ENTER
Chlorine Sensor Calibration
Zero Point Calibration
Zero Point Calibration is only used at the factory to program
the sensors zero calibration point. This value does not shift
throughout the life of the electrode and does not need to
be performed in the
fi
eld. After completing Temperature
Calibration, proceed to In-Process Calibration, page 25.
For Reference Only:
The chlorine sensor needs to be calibrated against two
chlorine references: zero chlorine and the process chlorine.
Typically the zero point calibration is very stable. Calibration
must be done with every new sensor and any time a
membrane cap is replaced.
1. Keep of
fl
ine any 4 to 20 mA devices or relay actuated
output devices that connect to the transmitter.
2. Turn off the water
fl
ow and remove the powered chlorine
sensor with the electronics still attached.
3. Place the sensor tip in distilled water.
4. Wait until the reading stabilizes, then save the
calibration. Stirring the sensor in water is not necessary,
but allows the signal to stabilize faster.
Example: Set the Zero Point Calibration at 1.0 nA.
5. Go to the Calibrate Menu.
6. Scroll down
▼
one menu to the
Cl Zero
menu.
7. Press
►
to enter Edit Mode. The live sensor readings in
ppm and nA will be
fl
ashing. These readings cannot be
modi
fi
ed, but can only be saved as displayed.
8. Press the Enter button at the lowest reading to save the
setting or press to escape without changes.
9. Exit to the View Menu.
10. After Zero Point Calibration is complete, replace the
sensor back into the
fl
ow cell and turn the water
fl
ow
back on.
11. Wait until the chlorine readings stabilize once again, then
perform a chlorine In-Process Calibration.
E X A M P L E
