EC400-en-GB_V2.7 12/16
7
Measurement and Display Considerations
If the unit appears to be locked (display frozen). It is possible that the Data Hold mode has
been inadvertently accessed by pressing the
MODE/HOLD
button. (“HOLD” will be displayed
in the bottom left of the LCD.) Simply press the MODE button again or turn the meter off and
then on.
For maximum accuracy, allow sufficient time for the temperature of the probe to reach the
temperature of the sample before calibrating. This will be indicated by a stable temperature
reading on the display.
Reset Calibration Data
Follow this procedure to clear all calibration data from the meter. Resetting the calibration data may
be necessary when new calibration solutions are used or accuracy of measurements is in question.
1. Turn off the meter.
2. Press and Hold the Cal/Recall and Mode/Hold buttons.
3. Momentarily press the On/Off button, as soon as the display comes on, release all 3
buttons.
4. The display will show “
dFLt rSt
” (default reset) and all of the calibration data will be erased.
If “
dFLt rSt”
does not appear, retry the procedure.
5. Proceed to the calibration routine for pH and Conductivity.
Calibration - Conductivity
Meter accuracy verification should be performed on a periodic basis. Once per month is the
recommended cycle for normal use. If calibration is required, a conductivity standardizing solution
must be obtained. The meter can be calibrated in any or all of the three ranges. Standardizing
solutions of 84µS/cm, 1413µS/cm or 12.88mS/cm (12,880µS/cm) are used for the automatic
calibration recognition procedure. No other calibration values are permitted.
Calibration is always done in conductivity mode. Since salinity and TDS values are calculated from
conductivity values, this procedure also calibrates the salinity and TDS ranges.
1.
Fill a sample cup with the standardizing solution.
2.
Turn the meter ON and insert the electrode into the solution. Tap or move the electrode in the
sample to dislodge any air bubbles.
3.
Press and hold the
CAL/RECALL
button (approximately 2 seconds) until “CAL” appears in
the lower (temp) display. The main display will start flashing.
4.
The meter will automatically recognize and calibrate to the standardizing solution. The display
will briefly indicate “SA”, “End” and then return to the measurement mode after a calibration.
Note: The “SA” will not appear if the calibration fails.
5.
The “range calibrated” symbol will appear in the display for each range that is calibrated
during that power on cycle.
Low range, 84µS/cm
Medium range, 1413µS/cm
High range, 12.88mS/cm (12,880µS/cm)
Note: Each time the calibration mode is entered all calibration symbols on the display are cleared,
but only the calibration data for the currently calibrated range is replaced. The other two ranges
keep the existing calibration data, just the symbols are removed. Calibration of all three ranges must
be performed during one power on period for all three range calibration symbols to appear.
See
Reset Calibration Data
to clear all calibration data from the meter.
Note: The meter allows for a 1, 2 or 3 point calibration. If calibration is done for more than one point
the lowest value standard should be done first to obtain the best accuracy.
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