Operation
Multi 350i
44
Standard solutions
Use two or three different standard solutions. For three-point calibra-
tion, the standard solutions have to be selected in either increasing or
decreasing order.
The calibration line is calculated by linear regression.
Note
The measurement precision is also dependent on the selected stan-
dard solutions. Therefore, the selected standard solutions should cover
the expected value range of the subsequent concentration measure-
ment.
Temperature while cali-
brating and measuring
For precise ISE measurements the temperature difference between
measurement and calibration should not be greater that 2 K. Therefore,
adjust the temperature of the standard and measuring solutions ac-
cordingly. If the temperature difference is greater the
[TempErr]
warn-
ing appears in the measured value display.
ISE Cal
This is the conventional
two-point
or
three-point calibration proce-
dure
that uses 2 or 3 freely selectable standard solutions. The concen-
tration expected in the measurement determines the concentration of
the calibration standards.
AutoRead
In calibration, the AutoRead function is automatically activated.
The current AutoRead measurement can be terminated at any time
(accepting the current value).
Calibration record
When finishing a calibration, the new calibration values are displayed
as an informative message (
i
symbol) first. Then you can decide
whether you want to take over these values of the new calibration or
whether you want to continue measuring with the old calibration data.
After accepting the new calibration values the calibration record is dis-
played.
Display calibration data
and output to interface
You can have the data of the last calibration displayed (see
section 4.8.5). Subsequently, you can transmit the displayed calibra-
tion data to the interface, e. g. to a printer or PC, with the
<PRT>
key.
Standard
solution
Values [mg/l]
Std 1
0.01; 0.02; 0.05; 0.1; 0.2; 0.5; 1; 2; 5; 10; 20; 50; 100;
200; 500; 1000
If Std 2
>
Std 1, Std 3 must be
>
Std 2
If Std 2
<
Std 1, Std 3 must be
<
Std 2
Std 2
Std 3
Summary of Contents for Multi 350i
Page 10: ...Overview Multi 350i 8...
Page 82: ...Operation Multi 350i 80...
Page 106: ...Appendix Firmware Update Multi 350i 104...
Page 107: ......
