LaMotte Tracer 1741 Manual page 8

Preparation of Buffers
1. Fill a sample cup with 20 mL of distilled or deionized water.
2. Add one buffer tablet:
pH 4.0
pH 7.0
pH 10.0
3. Use the tablet crusher (0175) to crush the tablet. Stir until the tablet
has disintegrated.
NOTE: Buffers should be prepared fresh daily.
pH 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
first, 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 first, followed with the pH 4 buffer
and then the pH 10 buffer. For the most accurate results, always calibrate at
the sample temperature.
1. Place the electrode into a buffer solution (4, 7, or 10 pH) and press
the CAL button. Typically, pH 7 is calibrated first, then 4 or 10,
depending on the measurement range. If readings are going to be
made over the entire range, calibrate with 4, 7 and 10 buffers.
2. The TRACER will automatically recognize the solution and calibrate
itself to that value. The circled number on the display will match the
pH of the buffer.
Note that if the buffer is more than 1 pH unit off from the 4, 7, or 10
pH buffer, the TRACER will assume an error and abort the calibration.
and
CAL END
3. During calibration, the pH reading will flash on the main display.
4. When calibration is complete, the TRACER will automatically display
and return to the pH measurement mode.
END
5. Rinse the electrode with distilled water.
6. The appropriate circled indicator (4, 7, or 10) will appear on the
display when a calibration has been completed. The calibration will be
stored until a new calibration is performed.
7. For a two- or three-point calibration, repeat Steps 1-5.
8. The meter should be calibrated before each use to obtain the most
accurate results.
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