Delta OHM HD3406.2, Руководство пользователя, Страница: 16 / 44

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probe is not present, at the manually-set temperature. In the lower line, the closest temperature
compensated standard buffer value.
6. Press the CAL key. The unit of measurement (
μ
S/cm or mS/cm) appears on the comment line.
The central line shows the solution conductivity value at the measured temperature, or if the
probe is not present, at the manually-set temperature. In the lower line, the closest temperature
compensated standard buffer value.
If the measurement is in TDS, resistivity or salinity, by pressing CAL, the instrument goes
automatically into conductivity calibration mode.
7. Press ENTER to confirm the displayed value. The cell constant nominal value (KCELL) and the
set temperature coefficient
α
T
are displayed. Pressed repeatedly the ENTER key allows the cali-
bration on the point to be repeated, for example, in order to obtain a more stable value.
8. To end the probe calibration, press ESC.
9. Rinse the probe with water. If you are then going to perform low conductivity measurements, we
recommend rinsing the probe using distilled or bidistilled water.
The instrument is calibrated and ready for use.
Manual calibration of conductivity using non memorized standard solutions
Manual calibration is possible at any calibration solution and temperature if it is within the instru-
ment measurement limits and provided that you know the solution's conductivity at the temperature
at which the calibration is performed. Proceed as follows:
1.
Turn the instrument on with the ON/OFF key.
2. Set the probe's cell constant by selecting it from the admitted values: 0.01, 0.1, 0.7, 1.0 or 10.0
3. Dip the conductivity meter cell into a known conductivity solution until the electrodes are cov-
ered with liquid.
4. Stir the probe lightly to remove any possible air inside the measurement cell.
5. Press MENU, and then FUNC/ENTER until the item ALPH appears. The temperature coeffi-
cient
α
T
is displayed. Note down the value displayed as it must be set again at the end of the
procedure. Set the value to 0.00 . This excludes the temperature compensation during the con-
ductivity measurement.
6. Measure the temperature by pressing °C/°F. According to the temperature detected, determine
the calibration solution conductivity using the table specifying the conductivity according to
temperature.
7. Select the conductivity measurement by pressing
χ
- Ω -TDS.
8. Press the CAL key. The CAL symbol is turned on. The unit of measurement (
μ
S/cm or
mS/cm) appears on the comment line. If the calibration solution conductivity is sufficiently
close (-30% to +50%) to one of the standard solutions, the secondary line displays the value.
Otherwise it displays the calculated value according to current settings. In the central line the
solution conductivity value is indicated according to the cell constant current settings.
9. Use the arrows to select the conductivity value determined at point 4 and confirm using EN-
TER. If the ERR indication appears, see the note below.