Calibration Ph - LaMotte PockeTester 1766 User Manual

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CALIBRATION
For the most accurate results, allow suffi 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.
pH
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 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.
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.
LaMotte TRACER pH/TDS/Salt PockeTester
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