Reviewing The Cell Constant (Electric Conductivity); Setting The Tds Factor - Wohler WA 335 Instructions De Service

Settings
10.4 Reviewing the
cell constant
(electric conductivity)
Fig. 53: Cell constant

10.5 Setting the TDS factor

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The cell constant K expressed in cm
the ratio of the distance between the electrodes
to the electrode area
K = electrode distance / electrode area (cm
Wear and soiling will cause the cell constant to
change over time. Consequently, the cell con-
stant should be set by calibrating with a known
value.
The cell constant should be between 0.8-1.2
cm -1 .
• Connect the EC probe to the device.
• Press and hold the Set key to access the
Settings mode, then use the arrow keys to
access parameter P40.
Press the Enter key.
•
The cell constants P42, P43, P44 and P45 are
displayed in succession (cell constant per
measurement range).
The TDS factor is the value the device uses to
convert conductivity measurements to TDS.
NOTE!
The TDS factor to be used depends on the sub-
stances dissolved in the water. As a rule, the
factor is between 0.50 and 0.70.
Connect the EC probe to the device.
•
It is possible to set the factor for converting
conductivity to TDS via parameter P50.
• Default setting: 0.50
• Adjustment range: 0.30-1.00.
Press and hold the Set key to access the
•
Settings mode, then use the arrow keys to
access parameter P50.
Press the Enter key.
•
Set the factor using the arrow keys.
•
Press the Enter key to confirm the setting.
•
-1 indicates
-1 )