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Calibration
Step
Operation
Enter Slope Calibration
1
2A
Do Sample (Manual)
Calibration
Edit Buffer Value
Save New Buffer
Value
OR
2B
Do Auto Buffer
Recognition
Calibration
Edit Group Buffer
Value
4.4 Calibration in High Purity Water
When the DirectLine module is used with the HPW7000 High pHurity Water
Assembly an addition calibration step may be required. This involves doing an
independent check of the pH with a portable lab meter and then, if necessary, a
Sample Cal to correct the reading.
Step
1
Perform a 2-point calibration using either the Auto Buffer Recognition Calibration or Manual
Calibration per section 4.3.
Return the HPW7000 electrodes to the flow chamber and restart flow to the chamber.
2
Allow the flow chamber to "clean out" by flowing sample through the chamber for at least an
3
hour.
4
Check the pH of the process using a portable instrument that uses a flowing reference type
electrode. Make sure the sample is not exposed to air, otherwise the pH due to absorption
of carbon dioxide from the air.
5
If necessary adjust the HPW7000 pH to agree with the portable instrument reading by doing a 1-
point Sample Cal per section 4.3.
22
Table 4-3 Slope Calibration Procedure
Press
2
Hold
2
Momentarily
or
Momentarily
MODE
Momentarily
Hold
2
or
Momentarily
Table 4-4 High purity water calibration Procedure
DirectLine® DL421 Sensor Module User Manual
CAL2
For Sample (Manual) calibration, go to step 2A.
OR
For Auto Buffer Recognition calibration, go to
step 2B.
SCAL for one second then,
displays Live Buffer Value
To edit Buffer Value (Flashing Display)
Buffer Value is saved and goes to Online Display.
ACAL for one second then,
displays closest Group Buffer Value
(Flashing Display until stable reading is achieved
"New Value" – Selects ± 1 buffer group
(Flashing Display until stable reading is achieved)
then goes to Online Display
Procedure
Display
2/04
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