Instruction manual

32
System/Makeup Conductivity Calibration – Electrodeless Sensor
“1 pt Process Cal” and “Air Cal (Zero) will be displayed.
Use the Next key to move the cursor to the word “Calibrate” under the desired calibration routine.
Press the Enter key to start the calibration procedure.
Air Cal (Zero)
The Air Calibration is necessary on initial start up, or when installing a new sensor, in order to set
the sensor to read zero conductivity in air. This step must be done prior to the process calibration.
Place the Sensor in Air. Remove the sensor from the water and make sure that it is dry, especially
in the holes. Wait for several minutes while the conductivity reading stabilizes. Press the Enter
key to continue. If the value is within the range of calibration, it will display “Cal Successful”.
Press the Enter key after replacing the sensor in the water.
If not, it will display “New value out of limits, Cal Fail”. Refer to Section 7 for troubleshooting.
1 pt Process Cal
The reading from the system conductivity sensor will be displayed. Measure the conductivity of
the system water using a hand held conductivity meter, and use the Arrow keys to enter the actual
value. Press the Enter key to highlight ‘CONTINUE’, then press Enter again to put the new value
into memory.
If the calibration correction factor is within +/- 50% of the uncalibrated conductivity, the display
will say “Cal Successful”. Press the Enter key to resume control of the conductivity.
If the calibration factor is outside of +/- 50% of the uncalibrated conductivity, the display will say
“New value out of limits, Cal Fail”. The most likely cause of this is a dirty sensor. Refer to Section
6 for cleaning instructions. If cleaning fails to cure the problem, refer to Section 7 for
troubleshooting help.
System/Makeup Temperature Calibration
The current temperature reading will be displayed. Measure the actual temperature of the system
water and use the Arrow keys to enter this value. Press the Enter key to highlight ‘CONTINUE’,
then press Enter again to put the new value into memory.
If the calibration factor is within +/- 15 degrees C (27 degrees F) the display will be “Cal
Successful”, otherwise it will be “Cal Fail”.
pH Calibration
There are three calibration options that will be displayed. Use the Next key to move the cursor to
the word “Calibrate” beneath the option that you want to use, then press the Enter key to start the
calibration.
Most commonly used is the “2 pt Buffer Cal” where two pH standard solutions are used to
calibrate the electrode. This is the most accurate, since the slope of the electrode (mV output per
pH unit) is measured directly. This method uses manual temperature compensation, since the
temperature sensor is contained in the system conductivity sensor, which is not placed in the buffer
solution.