Conductivity Setting - OHAUS ST400 Manual De Instrucciones

ST400 & ST400M Portable Meter
Temperature (MTC mode); if MTC mode is used, all buffers and sample solutions should be kept
at the same setting temperature as far as possible.
In order to ensure accurate measurement of the pH value, the pH electrode should be regularly
calibrated.
Temperature unit, Celsius or Fahrenheit；Note: ° C = 5/9 (° F - 32)
Buffer groups, users can choose between United States, Europe, MERCK, DIN19266, DIN19267
and other buffer groups, see the appendix.
Continuous measurement, users can choose switch on or off the continuous mode. If you
choose to use continuous measurement, you need to set the timing value which means how long
an endpoint result will be recorded, the default timing value is 15s which means the meter will
record results every 15 seconds. When you return to pH measure screen, "continuous measure"
will show.
Note: After the continuous measurement is completed, please export the data and empty the
instrument memory. The continuously measured data cannot be displayed on the meter.
End point : automatic end-point or manual end-point mode.
 In the manual end-point mode, the meter will always show "measuring" before pressing the
measure-button. If reading is no longer changed by artificial judgment, then press
button to confirm the reading, the meter will show "measurement finished".

In the automatic end-point mode, performing measurement or calibration, the meter will
display "measuring or calibrating". The meter can determine the endpoint automatically, then
display "measurement finished".

Endpoint criteria: pH measurement: (Low)-The signal may not change by more than 0.6
mv/0.6pH in 4 seconds. (medium) – The signal may not change by more than 0.15mV/0.1pH
in 6 seconds. (High)-The signal may not change by more than 0.18mV/0.18 pH in 8 seconds.
Conductivity measurement- input signal may not change by more than 0.4% from the
average conductivity of the probe in 6 seconds.
Sensor ID, user can view the sensor ID
3.2.3

Conductivity Setting*

In the setup mode, press ▲ button, ▼button and
There are the following settings:
Calibration standard: User can select calibration standard between 10, 84, 500, 1413, 12880
μs/cm, which is closest to the sample value.
Reference temperature: the temperature used in temperature compensation, default value is
25° C
button to enter conductivity setting.
EN-11