Instruction manual

The “1pt Buffer Cal” is not as accurate, since it assumes that the slope of the electrode is 59

mV/pH unit, which will only be true with a new electrode. This can be OK if the pH never varies

far from the value of the standard solution used in the calibration. 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.

The third is a “1 pt Process Cal”, where the pH electrode is left in the process solution, and the pH

value is entered to match that of a hand held pH meter, or litmus paper. It also assumes a perfect

slope. Automatic temperature compensation is used, since the pH electrode is installed in the

system water with the conductivity sensor.

2 pt Buffer Cal

Step 1 will explain that control is suspended during the calibration procedure. Press the Enter key

when the cursor is on “Continue” to start the calibration. To cancel the calibration, press the Next

key to move the cursor to “Cancel”, then press the Enter key.

Step 2 will ask you to enter the temperature of the buffer solutions. Use the Arrow keys to change

the value of the temperature, then press the Enter key to highlight ‘CONTINUE’, then press Enter

again to put the value into memory.

Step 3 will prompt you to rinse the electrode, and place it into the first buffer solution. Press the

Enter key to continue.

Step 4 will ask you to enter the value of the first buffer solution. Use the Arrow keys to change the

value, then press the Enter key to highlight ‘CONTINUE’, then press Enter again to put the value

into memory.

Step 5 will display the mV output of the electrode in the first buffer. When this reading is stable,

press the Enter key to continue.

Step 6 will prompt you to rinse the electrode and place it in the second buffer. Press the Enter key

to continue.

Step 7 will ask you to enter the value of the second buffer. Use the Arrow keys to change the

value, then press the Enter key to highlight ‘CONTINUE’, then press Enter again to put the value

into memory.

Step 8 will display the mV output of the pH electrode in the second buffer. When the reading is

stable, press the Enter key to continue.

At the end of the calibration, the display will tell you if the calibration was successful or if the

calibration failed. If successful, press the Enter key after the electrode has been replaced into the

sample stream to resume control. If failed, refer to Section 7 for troubleshooting help. The

calculated slope being more than 80% different from theoretical causes a calibration failure, or by

the pH 7 mV offset being more than 60 mV.

1 pt Buffer Cal

Step 1 will explain that control is suspended during the calibration procedure. Press the Enter key

when the cursor is on “Continue” to start the calibration. To cancel the calibration, press the Next

key to move the cursor to “Cancel”, then press the Enter key.

Step 2 will ask you to enter the temperature of the buffer solution. Use the Arrow keys to change

the value of the temperature, then press the Enter key to continue.