In-Situ Con TROLL PRO Operators Manual (purchased after 10 May 2012) - Manual (Page 23)

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Aqua TROLL 400 Instrument
Configuring the Aqua TROLL 400 Sensor Options
Barometer
1. From the main screen, select Menu, Settings, Probes.
2. Select the Aqua TROLL 400 Instrument.
3. Select Options.
4. Select RDO, Barometer.
5. Use the arrow keys to select “Fixed” or “Auto,” and press Enter.
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If you select “Fixed,” you must then enter a barometric value.
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If you select “Automatic,” the Con TROLL PRO will provide a barometric value to
the probe.
RDO/Salinity
The Aqua TROLL 400 includes a conductivity sensor. You can use the live values from
this sensor for dissolved oxygen calculations or you can enter a default value.
1. From the main screen, select Menu, Settings, Probes.
2. Select the Aqua TROLL 400 Instrument.
3. Select Options.
4. Select RDO, Salinity.
5. Use the arrow key to select “Fixed” or “Auto,” and press Enter.
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If you select “Fixed,” use the arrow keys to enter the default salinity value, and
press Enter.
Conductivity/Alpha Coefficient
The alpha coefficient is used to convert actual conductivity to specific conductivity. This
coefficient is defined by Standard Methods for the Examination of Water and
Wastewater based on the chemical composition of the water.
1. From the main screen, select Menu, Settings, Probes.
2. Select the Aqua TROLL 400 Instrument.
3. Select Options.
4. Select Conductivity, Alpha.
5. Use the arrow keys to enter the desired coefficient.
6. Select Enter. (The default value is 0.0191.)
Conductivity/Reference Temperature
Conductivity of a solution changes with temperature, therefore conductivity calibration
solution is formulated in relation to a specific temperature called the reference
temperature. The Con TROLL PRO default reference temperature is 25° C, but you can
change it to reference 20° C if necessary. To determine the reference temperature you
should use, refer to your conductivity standard solution.