Xylem MULTI 3500i HANDHELD MULTIPARAMETER METERS User Manual

Page 46

Operation

Multi 3500i

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 (

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 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 3