7 ph calibration, Operation, 1 two point automatic calibration – Hach-Lange pHD sc User Manual
Page 23: 2 one point manual calibration
17
Operation
4.7 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.
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.
4.7.1 Two 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.
4.7.2 One Point Manual 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.