B) Measuring Probe For Conductivity - VOLTCRAFT KBM-100 Bedienungsanleitung

• Keep the button " /CAL" (5) pushed (approx. 3 seconds), until "CAL" (C) appears at the
bottom of the display and the value "7.00" flashes in the display (or a value according to the
liquid temperature; see print on the buffer solution).
Calibration starts now.
A brief push of the button " /CAL" (5) interrupts calibration prematurely.
• When calibration has been completed, the display shows "%" and the PTS-value ("percent-
age of slope") for the electrode. For a value below 70% or above 130%, the measuring
probe must be replaced. A value of 100% is best.
Then "SA" ("Save") and "End" appear, then the display shows the measured pH value.
The display "SA" does not appear if calibration fails. In this case, pull the measuring
probe from the buffer solution and rinse the tip of the measuring probe carefully
with distilled water. Wipe the measuring probe dry.
Then perform another calibration, check if the tip of the measuring probe has actu-
ally been fully submersed in the buffer solution.
Always perform a calibration with the buffer solution with pH value 7 first and only
then with the buffer solution with pH-value 4 (or alternatively with a buffer solution
with pH value 10, which is not enclosed).
Buffer solutions with any other pH values than pH 4, pH 7 and pH 10 cannot be
used for calibrating the combination meter.

b) Measuring probe for conductivity

• Insert the measuring probe for conductivity into the combination meter if you have not done
so yet. Switch on the combination meter The operating mode "COND" must be displayed
now.
• Carefully rinse the tip of the measuring probe with distilled water to remove the liquid residue
of the preceding measurements. Wipe the measuring probe dry.
• Put the measuring probe into the calibration solution (1413 µS/cm), so that the tip of the
measuring probe submerses by about 2 - 3 cm. Move the tip of the measuring probe back
and forth in the calibration solution a bit.
Wait for at least 30 seconds until the display of the measured value in the display stabilises a
little.
32