User`s guide

DO700 V1.0 8/09
11
Conductivity Measurement Mode
Preparation for Measurement
1. Unscrew the protective cap on the probe jack located on the bottom of the meter (store
the protective cap in the carrying case for later use).
2. Carefully connect the electrode to the meter’s input jack. The electrode can only be
inserted in one orientation. Once it is firmly connected, screw the electrode collar onto
the meter to secure it.
3. Turn the meter on using the power key
.
4. Press and hold
the ENTER key to select the desired mode: Conductivity, TDS (Total
Dissolved Solids), Salinity, or Resistivity.
Calibration
1. Press the CAL key and ‘CAL’ will appear flashing on the LCD.
2. Clean and dry the conductivity electrode (use distilled water to clean).
3. Immerse the electrode in the 1413μS/cm calibration solution.
4. Stir the solution with the electrode and allow it to rest in the solution until the stabilize
icon (
) appears.
5. Press CAL again and the display will flash ‘1413μS/cm’; After several seconds the
‘END’ icon will appear and the meter will return to the measuring mode.
6. The LCD will display the icon ‘M’, indicating that the calibration is complete.
7. If the measurement value is unstable, repeat the calibration until the measurement is
stable. Replace the electrode if necessary.
Notes: The meter is calibrated before leaving the factory and can generally be used
right out of the box. The meter can only be calibrated in the Conductivity mode and not
from the TDS, Salinity, or Resistivity modes.
Measuring the Conductivity of a Sample
1. Clean and dry the conductivity electrode and immerse in the sample solution.
2. Stir the solution and allow the electrode to rest in the solution until the reading
stabilizes (smile face icon appears).
3. Read the conductivity measurement on the meter’s display.
5. Press and hold
the ENTER key to select TDS (Total Dissolved Solids), Salinity,
Resistivity, or Conductivity measurement modes.
Calibration Considerations
This meter offers two calibration solution series (configurued in Parameter P1).
(a) (Europe & U.S.A. series) — 84μS/cm, 1413μS/cm, 12.88 mS/cm and 111.9 mS/cm
(b) (China series) — 146.6μS/cm, 1408μS/cm, 12.85mS/cm and 111.3 mS/cm
The DO700 offers a unique one-point calibration feature. The user can select the
calibration solution closest to the expected measuremnt value. In general the most
common calibration solution is 1413 μS/cm. Use the supplied conductivity electrode (K = 1
cm-1), and perform the calibration using the supplied 1413 μS/cm calibration solution. The
meter can then be used for measurements below 100 mS/cm. Please refer to the chart
below.