Xylem SI Analytics Lab 955 Quick Start Manual page 5

Lab 955
Determining/
setting up the cell
constant [C]
Determining the
cell constant
(calibration in
control standard)
Using the last
calibrated cell
constant
ba75928y01 10/2015
Due to aging, the cell constant slightly changes. As a result, an inexact
measured value is displayed. Calibration determines the current value of the cell
constant and stores this value in the meter.
Thus, you should calibrate at regular intervals.
You can either determine the cell constant of the conductivity measuring cell in
the range 0.800 ... 0.880 cm
KCl or adjust it manually in the range 0.800 ... 1.200 cm
Press <CAL> repeatedly until
1
Press <ENTER> or <CAL
2
The cell constant of the last calibration is displayed.
Immerse the measuring cell in the control standard solution, 0.01 mol/
3
l KCI.
Start the calibration with <ENTER>.
4
The determination of the cell constant with stability control starts. The
[Auto] display flashes until a stable signal is available.
The cell constant determined is displayed. The meter automatically sto-
res the cell constant.
Switch to the measuring mode with <ENTER>.
5
The determined cell constant is used.
Prerequisite: No valid calibration exists.
Press <CAL> repeatedly until
1
Press <ENTER> or <CAL
2
If necessary, press <CAL> repeatedly until
3
cell constant is displayed.
Confirm the selection with <ENTER>.
4
The displayed cell constant is used.
The meter switches to the measured value display.
-1
by calibration in the control standard 0.01 mol/l
CAL CELL
is displayed.
_
> to confirm the selection of
USE CELL
is displayed.
_
> to confirm the selection of
CAL
EN
English
-1
.
CAL CELL
.
USE CELL
.
and the last calibrated
5