In-Situ TROLL 9500 Operators Manual - Manual (Page 90)

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TROLL 9500 Operator’s Manual 0095110 rev. 007 01/09
7. If not already connected, connect the MP TROLL 9500 to a PC,
launch the software, and “find” the device. Win-Situ screens are
illustrated here. The Pocket-Situ interface is similar, with the Navi-
gation tree at the top and the Information pane below it.
8. Select the MP TROLL 9500 in the Navigation tree.
The software will automatically detect and display the installed sen-
sors.
9. Select Dissolved Oxygen in the Parameters list.
The sensor serial number (SN) and recent calibration information is
displayed, as shown in the screen below.
10. Select Calibrate.
11. Before the DO Calibration Wizard starts, you will be asked how
you want to handle barometric pressure. See the box below.
After dealing with barometric pressure the D.O. Calibration Wizard
displays a screen like the one below:
12. Select the number of calibration points.
1 point—100% D.O.
2 points—100% and 0% D.O.
13. Select the membrane type (stamped on membrane module, if not,
ITS
14. Select Air or Water as the medium for the first calibration point.
15. Select the stimulus at saturation:
s
temperature and barometric pressure.
s
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SECTION 13: DISSOLVED OXYGEN—POLAROGRAPHIC
Barometric pressure is important in converting measurement of D.O.
concentration to percent saturation, and a value is required for accurate
calibration. 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. 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.
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