LaMotte Tracer Salt Meter - Manual (Page 14)

CALIBRATION
For the most accurate results, allow sufficient 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 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.
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 flash. When
the calibration is complete, the TRACER will display “SA” and
“End” and return to normal operation.
5. The appropriately circled indicator (L, M or H) will appear on the
display when a calibration has been completed within one power on
cycle.
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