User Manual

<13. COMMISSIONING OF DO (Dissolved Oxygen)>
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IM 12A01A02-01E 5th Edition : Oct. 31, 2013-00
13.2 Measurement setup
In this section, set up various parameters relating to measurements.
Measurements are performed based on the measurement parameter setup.
If “Polarographic” is selected for “Sensor type” in the Sensor setup screen, the polarographic
application voltage can be set.
13.2.1 Sensor setup
Select a unit for sensors from mg/L, ppm, ppb, and %SAT. Select a value for sensor sensitivity
from0.45μA/ppm(50µm),0.90μA/ppm(25µm),andother.Ifyouselect“other,”enteran
appropriate value.
13.2.2 Temperature settings
SelectthetemperatureelementusedforcompensationfromamongPt1000andNTC22k.Select
the same type as the temperature element that is actually connected.
Celsius (°C) or Fahrenheit (°F) temperature units are available. If the unit is changed, the
following values are also recalculated automatically to the new unit:
• Manualtemp.
• Referencetemp.
• Temp.coefcient
• Temp.rangesinthematrix
13.2.3 Temperature compensation
Select “Manual” or “Automatic” for the temperature compensation type.
Select“Automatic”ifthetemperaturesensor’smeasuredvalueisusedor“Manual”ifno
temperature sensor is used.
NOTE
When Manual is selected on the Temperature compensation, a process temperature should be
set in the “Manual temp.” A temperature shown on the Main display or the Home display is this
manually set temperature.
13.2.4 Salinity compensation
This function is used to measure sample water containing salt such as sea water.
Thedissolvedoxygeninasolutionisaffectedbysalinity.Therefore,toconductaccurate
measurements,itisnecessarytocompensatetheinuenceofthesalinityofthesamplesolution.
To make salinity compensation, select “Enabled” for “Compensation.”
Calculate the saturated concentration value from the salinity and temperature of the actual
samplewaterbasedonTable1ofAppendix4(Solubilityofoxygeninwaterasafunctionof
temperature and salinity) and enter the value.
13.2.5 Pressure comp. (Measure)
Dissolvedoxygenconcentrationchangesdependingonchangesintheprocesspressureorair
pressure. To compensate this, enter a value of pressure (air pressure).
SeeTables2and3intheAppendix.
DO
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