Hach TitraLab KF1121, Basic User Manual

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Calibration
Calibrate the titrant
1. Make sure that the glass beaker, the sensor holder and all related parts are clean and dry. Put a
magnetic stir bar into the beaker.
2. Attach the beaker to the sensor holder. Make sure that the beaker fits tightly into the sensor
holder.
3. Read the related "Application Note" from the USB applications key for more instructions.
4. Fill the beaker with the applicable amount of solvent. Refer to the application note and Cell
management on page 25 to adapt the volume where applicable. Make sure that there is no
liquid spill. Make sure that the initial level is enough so that the sensor is correctly installed in the
sample. Do not put too much solvent in the beaker.
5. From the home screen, select Calibration .
6. If more than one application contains a titrant calibration method, push the up and down arrow
keys to highlight the application to use, then push
Select .
7. Calibration information shows on the display. If necessary, select an icon for more information or
to change some data.
Option Description
Information Shows more information about the calibration.
Operator Changes the operator ID. Select from a list of applicable operators.
8. Make sure that the icon at the bottom of the display is highlighted. Do the instructions that
show on the display adjacent to this icon. Make sure that the tubes and sensor are correctly
aligned.
9. Push Start to start the calibration. Calibration data shows on the display.
10. If the default stirring speed needs to be adjusted, push the up and down arrow keys to increase or
decrease the speed.
Note: This adjustment only applies to the current operation. The standard default stirring speed for the
application is not changed.
11. The cell drift threshold, stability bar, sample temperature and measurement duration are shown at
the bottom of the display. The stability bar shows the stability of the signal and ranges in color
from red (unstable), through yellow, to green (stable). The cell drift value is shown in the middle of
the display. These messages can be displayed under the cell drift value:
Message Description
Excess of water The measurement cell contains too much water. Titrant continues to be added until
the cell is dry.
Excess of titrant The measurement cell contains too much titrant. No more titrant is added.
Risk of cell overflow The measurement cell is full and there is a risk of liquid spill. The procedure stops.
Note: The stability bar or these messages are displayed at the bottom of the display during the calibration
procedure.
12. Two options are available during the cell conditioning procedure:
Option Description
Stop Aborts the measurement and no results are calculated. If selected during the Replicate Sample
option, then all data in the series is lost.
Skip Stops the cell conditioning and goes directly to the next step in the procedure. Results are then
calculated from measurement data available before
Skip is selected. Results can be less accurate
using this option.
13. Weigh the standard in its container and write down the result.
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