Hach LXV320.99.00001, User Manual

Page: 26 / 36

26
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.