Xylem HandyLab 600 - Manual (Page 23)

HandyLab 600 pH value
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Criteria for a stable
measured value
The Stability control function checks whether the measured values are stable
within the monitored time interval.
The minimum duration until a measured value is assessed as stable is the
monitored time interval. The actual duration is mostly longer.
5.1.2 Measuring the temperature
For reproducible pH measurements, it is essential to measure the temperature
of the test sample.
Most IDS sensors measure the temperature with a temperature sensor inte-
grated in the IDS sensor.
When operating a sensor without integrated temperature sensor, you first have
to measure and enter the temperature of the sample.
You can terminate the Stability control function and the HOLD func-
tion with <AR> or <M> at any time.
2. Using <ENTER>, activate the Stability control function manually.
The [AR] status indicator appears while the measured value is
assessed as not stable. A progress bar is displayed and the display of
the measured parameter flashes.
The [HOLD][AR] status indicator appears as soon as a stable mea-
sured value is recognized. The progress bar disappears and the display
of the measured parameter stops flashing.
The current measurement data are output to the interface. Measure-
ment data meeting the stability control criterion are marked by AR.
You can prematurely terminate the Stability control function manu-
ally with <ENTER> at any time. If the Stability control function is
prematurely terminated, the current measurement data are output
to the interface without the AutoRead info.
3. Using <ENTER>, start a further measurement with stability control.
or
Release the frozen measured value again with <AR> or <M>.
The [AR] status display disappears. The display switches back to the
previous indication.
Measured
parameter Time interval Stability in the time inter-
val
pH value 15 seconds ∆ : better than 0.01 pH
Temperature 15 seconds ∆ : better than 0.5 °C