Thermo Fisher Scientific Eutech PC 700 - Manual (Page 14)

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6. CONDUCTIVITY AND TDS MEASUREMENT
6.1 Taking Measurements
1)
Rinse the electrode with de-ionized or distilled water before use
to remove any impurities. Gently shake excess water droplets.
2) Dip the probe into the sample beyond the upper steel band
(utilize the fill line on the outside of the probe guard for
reference).
3) Allow time for the reading to stabilize. Note the reading on the display.
The clear yellow protective probe guard must be attached during
measurement. Erroneous results will occur while the probe guard is
removed
6.2 Automatic and Manual Ranging
.
The PC 700 automatically selects the optimum range in which your
readings appear. Refer to TABLE 1 for a list of the available ranges.
To turn-off automatic ranging, press . MEAS will flash, indicating
that manual ranging is active. To manually select the next range,
press again. After range 5, automatic ranging is resumed.
For example, a reading of 465 μS will automatically settle in range 3
(r3). Using manual range advancement this will read as 0.47 mS in
range 4 (r4), and 0.5 mS in range 5 (r5).
Automatic ranging is typically used since this will always provide the
best resolution.