LaMotte TRACER 1741 Mode D'emploi page 5

5. Always calibrate close to the expected measurement value.
6. A sponge is located in the electrode protective cap. Keep this sponge
soaked with a pH 4 solution to prolong the life of the electrode during
storage.
„ Preparation of Buffers
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.
„ 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 will be displayed.
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.
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.
9. Always turn the meter off and then on before calibrating to allow
sufficient time to complete the calibrations during one power cycle. If the
meter auto powers off during calibration the calibrations remain valid, but
new calibrations will turn the circled indicators off.
NOTE: Buffers should be prepared fresh daily.
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CAL
END