In-Situ TROLL 9500 Operators Manual - Manual (Page 43)

36 TROLL 9500 Operator’s Manual 0095110 rev. 007 01/09
TEST SETUP PARAMETERS
A complete test definition has five parts. The choices available in each
SCREEN
1. Test Name (Optional)
You may enter up to 16 characters to identify the test. A default name
is proposed. The test name is displayed in the Navigation tree, in the
test data file, and in the filename of tests extracted from the device to
the Data Folder on the host PC.
2. Parameters to Include
All available parameters are selected  by default. De-select any
parameter you do not want to measure during this test by clearing the
checkbox. Remaining choices will be tailored to your selection.
The barometric pressure and temperature channels are automatically
included when water-quality channels are selected so that their read-
ings are available for compensating the measurements.
3. Measurement Schedule
The available schedules depend on your device’s firmware and the
parameters selected for inclusion in the test. This list is a quick over-
view. Additional details are given later in this section.
s
interval, and all measurements are stored in the device memory.
s
“event” and conserve memory by having the device store only
measurements that differ from the previous stored measurement
of a designated parameter by a specified amount. Any available
With a D.O. sensor installed (polarographic or optical)—
Before the Test Wizard starts, you will be asked how you want to handle
barometric pressure. Barometric pressure is important in converting mea-
surement of D.O. concentration to percent saturation. If the TROLL 9500
cable is vented, an accurate barometric pressure value can be read from
the onboard barometric pressure sensor. If the TROLL cable is non-vented,
then a barometric pressure value should be entered manually.
The dialog box shown below asks if you wish to edit the barometric settings
in the absence of vented cable. Do one of the following:
s
using vented cable, click No — and you may want to check the “Don’t
ask me this again” box.
s
non-vented cable, click Yes. In the Edit Barometric Channel screen,
check the box indicating non-vented cable for measurements but
vented cable for calibration/programming.
s
on non-vented cable, click Yes. In the Edit Barometric Channel screen,
check the box indicating non-vented cable for measurements and enter
a barometric pressure value. For help in supplying information if the
cable is not vented, see
Section 9, Monitoring Barometric Pressure.
SECTION 6: LOGGING DATA
With an RDO ® optical D.O. sensor installed—
Before the Test Wizard starts, you will be asked how you want to handle
salinity compensation. The sensor does not react to changes in salinity.
To compensate for the lower solubility of oxygen in salty water, a salinity
value stored in the sensor can be applied. This ensures that the reported
concentration of dissolved oxygen in the presence of significant water
salinity is accurate. The compensation algorithm is applied internally before
concentration is reported by the sensor. Choose one of the following:
s
you may select the second option. However, the conductivity sensor
is subject to fouling, and any conductivity errors thus created will be
transmitted to the RDO sensor.
s
salinity, and a conductivity sensor is not present, select this option and
enter the salinity value (in PSU, Practical Salinity Units). The fixed value
is effective in situations where the salinity variability is low. The value
can be changed at any time by selecting the RDO sensor in the Naviga-
tion tree and clicking “Edit,” then Edit Salinity.