In-Situ TROLL 9500 Operators Manual - Manual (Page 123)

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TROLL 9500 Operator’s Manual 0095110 rev. 007 01/09
6. Select Nitrate in the Parameters list. The sensor serial number
(SN) and recent calibration information is displayed.
7. Select Calibrate.
The Nitrate Calibration Wizard starts. A screen like this is dis-
played.
8. Select the number of calibration points for this calibration, and the
concentration (ppm) of the calibration solution for each point.
Cal point 1 is the solution the sensor is soaking in now, the lowest
concentration for a multi-point calibration. If doing a three-point
bithermal cal, choose cal point 3 to be the same as either cal point
1 or cal point 2.
9. Select Next to continue.
10. In the next screen, select Run to begin the stabilization.
The display will continuously update as readings are taken and
compared against the stabilization criteria.
s
NOT TESTED is displayed 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 sensor deviation meets early stabiliza-
tion 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 calibration point will
be designated “USER SET” in the calibration report. (For more
on calibration reports, see “Calibration History” in Section 10.)
STABLE is displayed when the readings have stabilized suffi-
ciently to take a valid calibration point. The calibration proceeds
automatically to the next screen.
s
s
ings.
s
11. If doing a single-point calibration, go to step 16.
For a multi-point calibration, the Wizard returns to the screen
shown at step 10 and waits for you to situate the probe in the next
calibration solution and click Run.
8
9
10
6
7
SECTION 17: NITRATE