Hach 6120118 pH Calibration, One Point Automatic Calibration, Two Point Automatic Calibration

Operation

5.6 pH Calibration

The manufacturer offers one and two point automatic and manual calibrations for pH. An automatic calibration identifies the buffer table corresponding to the chosen buffer and automatically calibrates the probe after it stabilizes. A manual calibration is performed by placing the pH sensor in any buffer or sample with a known value and then entering that known value into the controller.

The value of the sample used in the manual calibration may be determined by laboratory analysis or comparison reading.

5.6.1One Point Automatic Calibration

1.From the Main Menu, select SENSOR SETUP and confirm.

2.Select the appropriate sensor if more than one is attached and confirm.

3.Select CALIBRATE and confirm.

4.Select 1 POINT AUTO. Select the available Output Mode (Active, Hold, or Transfer) from the list box and confirm.

5.Move the clean probe to buffer and confirm to continue.

6.Confirm when stable. A screen will display 1 Point Auto Complete and the slope (XX.X mV/pH).

7.Return the probe to process.

5.6.2Two Point Automatic Calibration

1.From the Main Menu, select SENSOR SETUP and confirm.

2.Select the appropriate sensor if more than one is attached and confirm.

3.Select CALIBRATE and confirm.

4.Select 2 POINT AUTO. Select the available Output Mode (Active, Hold, or Transfer) from the list box and confirm.

5.Move the clean probe to Buffer 1 and confirm.

6.Confirm when stable.

7.Move the clean probe to Buffer 2 and confirm.

8.Confirm when stable. A screen will display 2 Point Calibration Complete and the slope (XX.X mV/pH).

9.Return the probe to process.

28