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Low Battery Indication
When the batteries become weak the “ ” icon will appear in the
display. Refer to the Maintenance section for battery replacement
information.
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 WQ120 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
WQ120 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 WQ120 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 WQ120 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.
7. See Reset Calibration Data to clear all calibration data from the
meter.
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.
