Extech Instruments ExStik EC500 User Manual page 7

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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
with pH 7 buffer first, then follow with pH 4 then the pH 10 buffer.
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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
assume an error and abort the calibration (
measure mode.)
3. During calibration, the pH reading flashes on the main display.
4. When calibration is complete, the ExStik
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
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.
7. See Reset Calibration Data to clear all calibration data from the meter.
CAL Reminder Display
When in pH measurement mode,
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
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.
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.
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
If does not appear, retry the procedure.
5. Proceed to the calibration routine for pH and Conductivity.
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. When doing a 2 or 3 point calibration, calibrate
will be displayed, and the unit will return to
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automatically displays
is not performing to expected specifications. If
ration data will be erased.
7 EC500-en-US_v2.9 7/20
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