Xylem EC510 PORTABLE CONDUCTIVITY METER KIT - Manual (Page 8)

EC500 V2.1 7/13/05 8
Calibration - pH (1, 2, or 3 points)
1. Place the electrode into a buffer solution (4, 7, or 10). Press and hold the
CAL/RECALL key until “CAL” appears in the lower (temp.) display. When doing a 2
or 3 point calibration, calibrate with pH 7 buffer first, then follow with pH 4 then the pH
10 buffer.
2. The ExStik ® automatically recognizes the solution and calibrates itself to that value
(the circled number on the LCD will match the solution). Note that if the solution is
more than 1 pH unit off from the L (4), M (7), or H (10) pH buffer, or if the electrode
slope is low, the ExStik
® will assume an error and abort the calibration (End will be
displayed, and the unit will return to measure mode.)
3. During calibration, the pH reading flashes on the main display.
4. When calibration is complete, the ExStik ® automatically displays “SA”, then “END”
and returns to normal operation mode.
5. The appropriate circled indicator (L, M, or H) appears on the LCD when a particular
calibration or series of calibrations has been completed within one power on cycle.
When the ExStik
® is turned off, the circled indicator configuration and the calibration
data will be retained.
6. For a two or three point calibration, repeat steps 1-4.
CAL Reminder Display
When in pH measurement mode, a “CAL” icon will appear after 15 on/off cycles of the
meter without performing a calibration. The CAL display is simply a reminder to calibrate
pH, and will turn off when the pH electrode is recalibrated. The reminder does not affect
function in any way.
RENEW Display
A flashing ‘RENEW’ warning indicates that the probe is not performing to expected
specifications. If cleaning and recalibration does not cause the RENEW icon to disappear,
replace the probe (see optional accessories on the last page of this manual). The RENEW
display appears as a result of the pH electrode slope falling below 70% of a nominal slope.
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/HOLD 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.