In-Situ TROLL 9500 Operators Manual - Manual (Page 101)

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TROLL 9500 Operator’s Manual 0095110 rev. 007 01/09
TIP: A warning box will appear if the slope is out of range
(normal range is 0.9 to 1.1 with an offset of ±0.1). Repeat
the zero point.
FINALIZE THE CALIBRATION
14. The final calibration screen for a 1-point calibration at saturation
was performed. To finalize the calibration, click Finish.
SECTION 13: DISSOLVED OXYGEN—OPTICAL
12. When you are ready to take the calibration point, click or tap Run
in the Zero Oxygen Point screen.
The display will continuously update as readings are taken and
compared against the stabilization criteria. Controls and status
indicators are the same as for the 100% calibration point.
13. When readings have stabilized, the screen will appear similar to
the one shown in step 10, and you have two choices:
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TIP: Sodium sulfite consumes oxygen aggressively. If
performing the oxygen saturation point next, be sure to rinse
the TROLL 9500 and RDO sensor thoroughly to avoid
cross-contamination.
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believe the sensor values are incorrect. Go back to step 12.
Status indicators:
NOT TESTED appears until you begin the calibration by selecting Run.
UNSTABLE indicates the sensor response does not meet the criteria
for a valid calibration point.
NOMINAL indicates the deviation meets early stabilization criteria.
The Accept button becomes available when nominal stability is
achieved. You may accept the early value, or wait for complete stability. If
you accept the early value, the status will be designated “USER SET” in
the calibration report. (For more on calibration reports and the difference
between Nominal and Stable, see Section 10 of this manual.)
STABLE is displayed when the readings have stabilized sufficiently
to take a valid calibration point.
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C, and RDO sensor response is shown in mg/L. Win-Situ auto-
matically detects stability in both parameters.
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enables you to follow the progress of the stabilization, but devia-
tion from the previous reading is not necessarily the best indicator
of stability as the software is looking at longer-term trends.
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