In-Situ Con TROLL PRO Operators Manual (purchased after 10 May 2012) - Manual (Page 30)

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9. When you select Stable, the Standard Value screen appears. The instrument auto-
detects the standard buffer in which it was calibrated. Use the arrow keys if you
need to change the calibration buffer value, and select Enter.
10. If you are performing a multi-point calibration, you are prompted to place the probe
in the next buffer, and press OK.
11. Continue in this manner until the calibration is complete.
Calibrating the ORP Sensor
1. From the Con TROLL PRO main screen, select Menu, Calibrate.
2. Select the Aqua TROLL 400 Instrument.
3. Select pH/ORP.
4. Select ORP, and press Select.
5. Use the arrows to select either Quick Cal, ZoBell’s, or Other standard calibration
solution, and press Select.
The "Other" option should be used when you want to calibrate
Aqua TROLL 400 to another instrument, or when you are using a
calibration standard other than Quick Cal or ZoBell’s.
6. Place the Aqua TROLL 400 in the solution.
7. Press OK.
8. You will see the Calibration Beginning icon next to the mV and temperature values.
When the calibration reaches stability, select Stable or Cancel to return to the pre-
existing calibration.
9. If you select Stable, the Standard Value screen appears. The instrument auto-
detects the calibration standard in which it was calibrated. Use the arrow keys if you
need to change the calibration standard value. If you selected “Other” in Step 3, it is
important to enter a value.
Calibration Hints
Nominal Stability vs. Full Stability
To meet the criteria for a valid calibration point, the change (delta) in sensor response is
monitored over time. The controller is looking for the calibration solution temperature
and the sensor 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 the instrument is overdue for a factory recalibration, the Service Needed
icon
will appear on the display.
l
Factory recalibration of the Aqua TROLL 400 Instrument should be performed
every 12 months.
l
RDO Classic Sensor caps must be replaced annually.