Measurement And Display; Technique - LaMotte PockeTester 1766 User Manual

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Measurement and Display

• If the unit appears to be locked (display frozen). It is possible that
the Data Hold mode has been inadvertently accessed by pressing the
MODE button. ("HOLD" will be displayed in the bottom left of the
display.) Press the MODE button again or turn the meter off and then
on.
• For maximum accuracy, 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.

Technique

• Do not touch the inner surfaces of the conductivity electrodes.
Touching the surface of the platinized electodes may damage and
reduce the life of the probe.
• Store the electrode in the wetting cap with the sponge moistened with
pH 4.0 buffer solution.
• Always rinse the electrode in deionized or distilled water between
measurements to avoid cross contamination of the sample. Double
rinsing is recommended when high accuracy is required.
• Periodically, accumulated salt deposits from the reference electrode
may build up in the storage cap, and should be rinsed away. These
deposits could affect measured values of low conductivity samples.
• When measuring low conductivity samples, extra care is recommended
in rinsing the probe to avoid contamination of the sample with electrolyte
from the pH reference electrode. This will only be a factor when
the volume of the sample. (Example: Try a 200 to 500 mL sample.)
• When a 20mL sample cup is usedthe electrode should not be allowed
to sit in the sample for any longer than necessary, to avoid electrolyte
leakage into the sample, raising the conductivity value.
10 LaMotte TRACER pH/TDS/Salt PockeTester
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