Measuring The Temperature - wtw pH 3310 IDS Operating Manual

pH 3310 IDS
Criteria for a stable
measured value
ba77035e01 02/2014
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.
The Stability control function checks whether the measured values are stable
within the monitored time interval.
Measured Time interval
parameter
pH value 15 seconds
Temperature 15 seconds
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.
IDS sensors measure the temperature with a temperature sensor integrated in
the IDS sensor.
When operating a sensor without integrated temperature sensor, e.g.
via an IDS pH adapter, you have to measure and enter the temperature of the
test sample first.
Stability in the time inter-
val
∆ : better than 0.01 pH
∆ : better than 0.5 °C
pH value
23