17
pH • TRACER
For complete instructions, see the Tracer manual.
Before
fi
rst use, hold the meter by the top battery compartment and swiftly
tap the back of the meter downward into your palm (not a hard surface). This
assures that the internal electrolyte moves to the very tip of the electrode. The
electrolyte should
fi
ll the circular junction window at the tip of the electrode.
Before
fi
rst use or after storage, soak the electrode in tap water or pH buffer
solution for about 10 minutes.
For the most accurate results, allow suf
fi
cient 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.
CALIBRATION
The TRACER can be calibrated at 1, 2 or 3 points. For the most accurate
results with a two point calibration, calibrate the TRACER with a pH 7 buffer
fi
rst, then calibrate with either a pH 4 or pH 10 buffer whichever is closest to the
pH value of the sample to be tested. When performing a three point calibration,
calibrate with the pH 7 buffer
fi
rst, followed with the pH 4 buffer and then the
pH 10 buffer.
Preparation of Buff ers
1. Fill a sample cup with 20 mL of distilled or deionized water.
2. Add one buffer tablet:
pH 4.0
Code 3983A
pH 7.0
Code 3984A
pH 10.0
Code 3985A
3. Use the tablet crusher (0175) to crush the tablet. Stir until the tablet has
disintegrated.
NOTE: Buffers should be prepared fresh daily.
Calibration
1. Fill a sample cup to the 20 mL line with a buffer solution.
2. Press the ON/OFF button to turn the TRACER ON.
3. Place the electrode in the buffer solution. Press and hold the CAL/RECALL
button until “CAL” appears in the lower display. The meter will automatically
recognize the buffer and calibrate itself to that value. The circled number
on the display will match the value of the buffer.
NOTE: If the buffer solution is more than 1 pH unit off from 4, 7, or 10, or
the electrode slope is low, the meter will assume that there is an error and
the calibration will be terminated. END will be displayed.
4. During the calibration the pH value on the display will
fl
ash. When the
calibration is complete, the TRACER will display “SA” and “End” and return
to normal operation.
