OHAUS STARTER 3100C, Instruction Manual, Page: 15 / 84

STARTER 3100C Bench Conductivity Meter EN-11
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When in Auto End Point Mode, the meter determines when the reading is stable
then displays and locks the reading or calibration value automatically, the reading
freezes and blinks 3 times then disappears; blinks 3 times and freezes
on the display.
Place the conductivity sensor in the selected calibration standard, wait 10-15s, then press
.
The calibration icon and the measurement icon appear on the display. The icon is
blinking during calibration measurement. The meter reaches endpoint automatically according to
the preselected auto-endpoint mode after the signal has stabilized.
When the calibration is finished, the standard value is displayed and stored; the measurement
icon blinks 3 times and disappears.
To finish the calibration and return to the sample measurement, press . The cell
constant is then shown on the display for 3 seconds.
Note:
To ensure the most accurate conductivity readings, you should verify your cell constant with a
standard solution before measurement and recalibrate if necessary. Always use fresh standards.
For STCON3 the normal cell constant range is 1.50
– 2.00. (e.g. 1.71 /cm) if the cell constant is
outside the range due to an improper calibration, you may need to recover factory settings (see
5.4), then repeat calibration.
4.2 Sample measurement
Place the conductivity sensor in the sample, wait 10-15s, then press to start the
measurement. The measurement icon appears on the display. The measurement icon is
blinking during measurement and the display shows the conductivity of the sample.
When it reaches endpoint (auto endpoint or manual endpoint), you can record the result.
Stability criterion for conductivity measurement: The sensor input signal of the meter may not
change by more than 0.4% from the measured average conductivity of the probe in 6 seconds.
4.3 TDS and Salinity measurement
To perform a TDS or salinity measurement, follow the same procedure as for a conductivity
measurement. Press to switch between conductivity and TDS measurement mode.