In-Situ Con TROLL PRO Operators Manual (purchased before 10 May 2012) - Manual (Page 18)

18 Calibrating the Probes
3.2 CALIBRATING THE LEVEL TROLL INSTRUMENTS
The Level TROLL instrument has been factory-calibrated with NIST standards to a
greater degree of accuracy than can be achieved in nearly any alternate setting.
The Level TROLL has the ability to be “zeroed” in air, but should never be “zeroed”
in water. Overall, In-Situ Inc. does not recommend zeroing the sensor.
3.2.1 Zero Pressure (Air Only)
1. From the Con TROLL PRO Main menu, select Calibrate, Level TROLL, then
Zero Pressure.
3.2.2 Restoring Defaults
If you have zeroed the Level TROLL and wish to return to the factory settings:
1. From the Con TROLL PRO Main menu, select Calibrate, Level TROLL, then
Defaults.
3.3 CALIBRATING THE AQUA TROLL INSTRUMENTS
From the Con TROLL PRO Main menu, select Calibrate, then Aqua TROLL 200 (or
100). You will have the following options:
1 Conductivity
2 Zero Pressure
3 Defaults
3.3.1 Calibrating Conductivity
The Aqua TROLL 200 instrument’s factory calibration with NIST-traceable
standards guarantees a high degree of linearity across the entire operating range of
5 to 100,000 µS/cm. This is described as a “flat” response. The Aqua TROLL 200 is
capable of meeting its published specifications without requiring additional
calibration by the user, as most commercially available standards can introduce a
larger potential measurement error than the instrument’s initial factory calibration.
A user calibration is only recommended if you must conform to a standard
operating procedure or if the cell has undergone physical change (e.g., deposits on
cell walls that cannot be removed; physical damage to cell walls).
1. If you opt to calibrate the Aqua TROLL conductivity cell, refer to the calibration
procedure in the Aqua TROLL Operator’s Manual for laboratory setup
instructions.
2. From the Con TROLL PRO Main menu, select Calibrate, then Aqua TROLL 200
(or 100), then Conductivity.
3. Use the arrow keys to enter the standard value. Select Enter.
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 7).
FIGURE 7. Beginning the calibration; accepting or cancelling the calibration
Cancel
Conductivity
12102 μS/cm
23.1 °C
Stable Cancel
Conductivity
12050 μS/cm
23.1 °C
Calibration beginning Accept or cancel calibration
Nominal Cancel
Conductivity
12050 μS/cm
23.1 °C
Accept or cancel calibration