Hach-Lange TSS PORTABLE Handheld Instrument for Turbidity_Suspended Solids Manual - Manual (Page 26)

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Operation
5.1.3 Manual calibration value correction
1. Select MENU , confirm with ENTER/ON .
2. Select CALIBRATE , confirm with ENTER/ON .
The instrument reads the probe data.
3. Select the curve shown and confirm with ENTER/ON .
4. Select the desired curve and confirm with ENTER/ON .
5. Select the desired point and confirm with ENTER/ON .
6. Overwrite the existing calibration point.
7. Enter the value for the calibration point using the navigation keys and confirm with
ENTER/ON .
• Navigation key LEFT/RIGHT : Jump to next/previous decimal place
• Navigation key UP/DOWN : Change number
5.1.4 Delete calibration point
Same procedure as in section 5.1.3 . Set the concentration of the calibration point to the
value 0.000 and confirm with ENTER/ON . The calibration point is deleted.
5.1.5 Reset to default calibration
If the turbidity calibration was changed, it can be reset to the default calibration in
accordance with ISO 7027.
Note: Stop the current measurement before the default calibration is reset.
1. Select MENU , confirm with ENTER/ON .
2. Select CALIBRATE , confirm with ENTER/ON .
The instrument reads the probe data.
3. Select turbidity curve C-Tu and confirm with ENTER/ON .
Note: If turbidity curve C-Tu is not shown in the menu, select the curve shown and confirm with
ENTER/ON. The selection menu for the curves is shown. Select curve C-Tu and confirm with
ENTER/ON. Curve C-TU is activated.

Open the selection menu for curve C-TU with ENTER/ON, select RESET and confirm with
ENTER/ON.
4. Press navigation key UP/DOWN , select RESET and confirm with ENTER/ON .
The DS curves can also be reset to the default calibration (1-point calibration at 4 g/L).
However, a precise determination of the solids concentration can only be obtained through
calibration (refer to
section 5.1, page 23 ).
5.2 Measure
Note: In order to obtain precise solids measurement results, you must calibrate the instrument
before the first measurement is taken.

Without any calibration of the DS curves, the instrument returns to 1-point default calibration at
4 g/L. Deviations from the actual measurement value may occur.