In-Situ Con TROLL PRO Operators Manual (purchased after 10 May 2012) - Manual (Page 22)

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4. You will see the Calibration Beginning icon next to the μS/cm value. When the
calibration reaches stability, choose Stable to accept the value or Cancel to return to
the pre-existing calibration.
Figure 4.1 Beginning the calibration; accepting or canceling the calibration
Zeroing the Pressure Sensor
Aqua TROLL 200 has been factory calibrated with NIST standards to a greater degree
of accuracy than can be achieved in nearly any alternate setting.
The pressure sensor in an Aqua TROLL 200 can be “zeroed” in
air, but should never be “zeroed” in water. In-Situ Inc. does not
recommend zeroing the pressure sensor.
Setting a Level Reference
1. From the main screen, select Menu, Calibrate.
2. Select the Aqua TROLL 200 Instrument.
3. Select Level Reference, and use the arrow keys to enter the level reference value,
and Press Enter.
Calibration Hints
Nominal Stability vs. Full Stability
To meet the criteria for a valid calibration point, the change (delta) in probe response is
monitored over time. The controller is looking for the calibration solution temperature
and the probe readings to settle over a specific time period. The criteria for Full Stability
are designed to meet the published specifications. The criteria for Nominal Stability are
designed to shorten the calibration time when an approximate calibration is acceptable.
Factory Recalibration
Proper maintenance can improve your results and extend the life of the instrument.
When your instrument is overdue for a factory recalibration, the Service Needed
icon
will appear on the display.
l
Factory recalibration of the Aqua TROLL Instruments should be performed every
12 to 18 months.