Honeywell DirectLine DL421, Руководство пользователя, Страница: 28 / 40

Calibration
22 DirectLine® DL421 Sensor Module User Manual 2/04
Table 4-3 Slope Calibration Procedure
Step Operation Press Display
1
Enter Slope Calibration
2
Hold
CAL2
For Sample (Manual) calibration , go to step 2A.
OR
For Auto Buffer Recognition calibration , go to
step 2B.
Do Sample (Manual)
Calibration
2
Momentarily
SCAL for one second then,
displays Live Buffer Value
Edit Buffer Value
or
Momentarily
To edit Buffer Value (Flashing Display)
2A
Save New Buffer
Value
MODE
Momentarily
Buffer Value is saved and goes to Online Display .
OR
2B Do Auto Buffer
Recognition
Calibration
Hold
2
ACAL for one second then,
displays closest Group Buffer Value
(Flashing Display until stable reading is achieved
Edit Group Buffer
Value
or
Momentarily
“New Value” – Selects ± 1 buffer group
(Flashing Display until stable reading is achieved)
then goes to Online Display
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.
Table 4-4 High purity water calibration Procedure
Step Procedure
1 Perform a 2-point calibration using either the Auto Buffer Recognition Calibration or Manual
Calibration per section 4.3.
2 Return the HPW7000 electrodes to the flow chamber and restart flow to the chamber.
3 Allow the flow chamber to “clean out” by flowing sample through the chamber for at least an
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.