Determining The Cell Constant (Calibration In Control Standard) - Xylem WTW Cond 3310 Operating Manual

Operation
Why determine the cell
constant?
Procedure
Stability control
(AutoRead)
Display calibration data
and output to interface
32
Menu item
Measurement /
Temperature unit
Reset
4.4.5 Determining the cell constant (calibration in
control standard)
Aging slightly changes the cell constant, e.g. due to coatings. As a
result, an inexact measured value is displayed. The original character-
istics of the cell can often be restored by cleaning the cell. Calibration
determines the current value of the cell constant and stores this value
in the meter.
Thus, you should calibrate at regular intervals (we recommend: every
6 months).
You can determine the actual cell constant of the conductivity measur-
ing cell by calibrating with the control standard in the following ranges:
 0.450 ... 0.500 cm
(e.g. TetraCon 325, nominal cell constant 0.475 cm
 0.800 ... 0.880 cm
(e.g. KLE 325 with a nominal cell constant of 0.840 cm
The cell constant is determined in the control standard, 0.01 mol/l KCl.
Cell constants outside the ranges quoted above cannot be calibrated.
In the default condition, the calibrated cell constant of the meter is set
-1
to 0.475 cm (conductivity sensor TetraCon 325).
In calibration, the Stability control function (AutoRead) is automatically
activated.
You can have the data of the last calibration displayed (see section
4.4.6). Subsequently, you can transmit the displayed calibration data to
the interface, e.g. to a PC, with the <F2>/[USB output] key.
Note
The calibration record is automatically transmitted to the interface after
Possible Explanation
setting
°C Temperature unit,
°F degrees Celsius or degrees
Fahrenheit.
All temperature values are dis-
played with the selected unit.
- Resets all sensor settings to
the delivery condition (see
section 4.8.1).
-1
-1
Cond 3310
-1
)
-1
)
ba75803e08 10/2017