Carl Roth COND 50 VioLab, Instruction Manual

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UM Serie 50VioLab EN rev.1 19.05.2020
EN
ATTENTION: Before proceeding with the calibration operations, carefully consult the
safety data sheets of the substances involved:

Calibration Buffer solutions.

Manual COND calibration
Example: Calibration at 5.00 µS/cm using a K=0.1 cell constant

Access the Setup menu for COND SETTINGS and select in the P3.1

0.1 and into the program P3.2

Custom, then go back to the measurement and go into COND mode .

Press the key to enter the calibration mode.

Rinse the cell with distilled water and dab gently with paper towel.

Apply few ml of standard solution and immerse the sensor in the conductivity standard 5.00 µS/cm.

The string “WAIT FOR STABILITY” and the flowing red bands indicate that the measurement is not stable
yet.

Wait for the Conductivity value on the display to stabilize; when the icon appears, use the keys
and to adjust the value by entering that of the standard solution (e.g.: 5.00 µS/cm), as
indicated by the string “ADJUST THE VALUE” and by the icon .

When the icon appears again, confirm the calibration point by pressing the key .

The actual measured value flashes on the display and then it is shown the updated cell constant.

The icon appears, which indicates that the instrument is calibrated in the low conductivity range.
Automatically, the device returns to measure mode.

For each cell constant (P3.1), the instrument stores the calibration in order to allow the user, who uses
multiple sensors with different constants not to be forced to recalibrate each time.
The instrument recalls the last calibration with respect to parameter P3.1 (cell constant) and P3.2 (type of
calibration solutions) selected.
Note: if you are not aware of the exact compensation coefficient, to obtain a calibration and
an accurate measurement set in P3.4

0.00 %/°C and then work by bringing the solutions
exactly to the reference temperature.
Another method of working without temperature compensation is to use the appropriate thermal tables
shown on the most Conductivity solutions.
Important: Always rinse the cell with distilled water before calibration and when switching from one
standard solution to another to avoid contamination.
Replace standard solutions frequently, especially low Conductivity ones.
Contaminated or expired solutions can affect the accuracy and precision of the measurement.

Errors during calibration

NOT STABLE: The button has been pressed with unstable signal. Wait for the icon to appear
to confirm the first point.

WRONG BUFFER: The buffer you are using is polluted or not part of the recognized families.

CALIBRATION TOO LONG: The calibration has exceeded the time limit, only the points calibrated up to
that moment will be stored.