Lovibond CheckitDirect, Instruction Manual

Page: 39 / 104

39
CheckitDirect_Cl-Br-pH-CyA-TA-CaH_2 09/2010
GB
Calibration Mode
CAL
CL
CAL
x
0.0.0
RESULT
CAL
: :
METHOD
METHOD
CAL
4
User calibration
Note :
user calibration (Display in calibration mode)
factory calibration (Display in calibration mode)
After confirming the selection with the [MODE] key the instrument will
show CAL/CL.
Scroll through methods using the [MODE] key.
Fill a clean vial with the standard up to the 10 ml mark, screw the cap
on and place the vial in the sample chamber making sure that the
marks are aligned.
Press the [ZERO/TEST] key.
The method symbol flashes for approx. 8 seconds.
The display shows the following in alternating mode:
Perform calibration with a standard of known concentration (see
"Operation").
Press the [ZERO/TEST] key.
The method symbol flashes for approx. 3 seconds.
The result is shown in the display, alternating with CAL.
If the reading corresponds with the value of the calibration standard
(within the specified tolerance), exit calibration mode by pressing the
[ON/OFF] key.
Changing the displayed value:
Pressing the [MODE] key once increases the displayed value by 1 digit.
Pressing the [ZERO/TEST] key once decreases the displayed value by
1 digit.
Press the corresponding key until the reading equals the value of the
calibration standard.
By pressing the [ON/OFF] key, the new correction factor is calculated
and stored in the user calibration software.
Confirmation of calibration (3 seconds).
Mode
On
Off
CAL
cAL
Recommended calibration values
Chlorine: between 0.5 and 1.5 mg/l
pH-value: between 7.6 and 8.0
CyA-TEST: between 30 and 60 mg/l
Alkalinity: between 50 and 150 mg/l CaCO
3
Calcium: between 50 and 200 mg/l CaCO
3
Separate calibration of the measuring range for bromine is not possible. The unit uses the
calibration for the chlorine measuring range.
Zero
Test
Zero
Test
Zero
Test