In-Situ Con TROLL PRO Operators Manual (purchased after 10 May 2012) - Manual (Page 29)

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7. If you select Stable, the Standard Value screen appears. The instrument auto-
detects the standard solution in which it was calibrated. Use the arrow keys if you
need to change the calibration standard value, and select Enter.
8. Press the More key to view the cell constant.
Figure 5.6 Beginning the calibration; accepting or canceling the calibration
Calibrating Pressure/Level
Zero Pressure
The Aqua TROLL 400 Instrument has been factory calibrated with NIST-traceable
standards to a greater degree of accuracy than can be achieved in nearly any alternate
setting.
The pressure sensor can be "zeroed" in air, but should never be
"zeroed" in water. In-Situ Inc. does not recommend zeroing the
pressure sensor.
1. From the main screen, select Menu, Calibrate.
2. Select the Aqua TROLL 400 Instrument.
3. Select Level.
4. Select Zero Pressure and wait for the calibration to complete.
5. Select Enter or Cancel.
Calibrating the pH/ORP Sensor
The Aqua TROLL 400 Instrument includes one sensor that measures both pH and
ORP, but the two parameters are calibrated separately.
Calibrating the pH 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 pH, and press Select.
5. Select One-point cal., Two-point cal., or Three-point cal., and press Select.
6. Place the instrument in the calibration standard and allow time for the temperature
to stabilize.
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 to accept the value or Cancel to
return to the pre-existing calibration.