User Manual

<14. CALIBRATION OF DO (Dissolved Oxygen)>
14-1
IM 12A01A02-01E 5th Edition : Oct. 31, 2013-00
14. CALIBRATION OF DO (Dissolved Oxygen)
Calibratedissolvedoxygensensorsafterinstallingorreplacingthem,cleaningthemembrane,or
replacing the electrolyte solution.
Air, water, and manual calibrations are available.
Air calibration is the most common and easiest method. Water calibration is more accurate.
Manual calibration uses manually analyzed sample water and adjusts the sensor to the value.
NOTE
A default is “10 min” for “Auto Return”. When maintenance like a calibration that may take much
timeisperformed,“60min”or“Disable”isrecommendedtobeselected.(Refertothesection
13.7.3.)
Execute:
Calibration
HOLD
Temporary output
Setup:
Commissioning
Change language
Start Quick Setup
Execute & Setup
Calibration
Air calibration
Water Calibration
Manual Slope Cal.
Manual Offset Cal.
Temperature Cal.
Start manual wash cycle
* This appears only when Zero
Calibration is set “Enabled” .
** This appears only when
“PH201G” is selected on the
Communication screen and
Wash contact is enabled.
**
*
Figure 14.1 Calibration
The calibration items include “Air calibration,” “Water Calibration,” “Manual Slope Cal,” and
“Temperature Cal.”
When Zero Calibration is set “Enabled” (see section 13.2.6), “Manual Offset Cal.” is available.
Press
toselect“Execute:Calibration,”choosethecalibrationobject,andcongurethe
calibrationtoperformit.Calibrationismadestepwise;followthepromptsdisplayedonthescreen
to carry it out.
Astabilitycheckisconductedateachmeasurementpoint.Proceedtothenextsteponlyafterthe
reading has stabilized.
NOTE
While“CHECKINGSTABILITY…”isindicated,theinstrumentautomaticallychecksthestability
ofthemeasurement(inputvalue).Ifthestabilityisnotconrmedwithin60min,anerrorisissued
and the procedure is aborted. Change the parameters in the stabilization time and step range as
necessary (see Section 13.2.6), and then recalibrate the sensor.
NOTE
Whenasensororamembraneisexchangedorreplaced,sensorwellnessdatashouldbereset.
When a sensor is replaced, the replacement can be recorded manually into a logbook. (Refer to
thegure12.9.)
DO
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