In-Situ Dissolved Oxygen: Clark Cell Calibration Kit for TROLL 9500 - Manual (Page 3)

Multi-Parameter Water Quality TROLL ®
11 Select the membrane type—stamped on the membrane
module. (When calibrating in water, the thickness is not
crucial.)
12 Select Water as the medium for the first calibration point.
13 Select the stimulus at saturation:
• Default—This value is calculated by the software at the
current temperature and barometric pressure.
• User Set—Enter a value from a look-up table if required.
14 Click Next to continue. A screen like this will be displayed:
15 With the sensor situated in the bubbled water, click or tap
Run to start the Oxygen Saturation calibration point.
The display will continuously update as readings are taken
and compared against the stabilization criteria.
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TIP: The current temperature and barometric pressure are
used to calculate the stimulus. If the calibration stimulus
was entered from a look-up table at step 13 and the
temperature is not as expected, you may select Stop, then
Back to retrieve the Setup page and re-enter the User Set
stimulus.
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10 11
14
12
13
Status indicators & controls during stabilization:
NOT TESTED may be displayed before the calibration
begins.
UNSTABLE indicates the sensor response does not
meet the criteria for a valid calibration point. All
parameters start out at “Unstable” status.
NOMINAL indicates the change in the sensor response
over time meets a relaxed stability criterion. “Nominal”
stability will occur first, and can be accepted to shorten
the calibration time.
STABLE indicates the change in the sensor response
over time meets the stability criteria for a valid
calibration point. Calibration advances automatically.
Sensor Reading: Current sensor response (nanoAmps).
Sensor Deviation: Change in response between the last
two readings. This enables you to follow the progress
of the stabilization, but deviation from the previous
reading is not necessarily the best indicator of stability
as the software is looking at longer-term trends.
Run button: Starts the calibration.
Accept button: Becomes available when Nominal
stability is reached 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 the MP TROLL Operator's Manual.)
Stop button: Stops the current phase of the calibration.
Back button: Goes to the previous screen (when
available).
Next button: Proceeds to the next screen (when
available).
Cancel button: Cancels the calibration.
16 When readings have stabilized (or you click to Accept the
Nominal result), the calibration will advance automatically.
For a one-point calibration, the final screen appears. (In
the screen shown below, a one-point calibration at
saturation was performed.)