Measuring The Ph Value - wtw Avantor VWR pH 1100 L Operating Manual

pH 1100 L
Stability control
(AutoRead )
Criteria for a stable
measured value
HOLD function
ba77068d05 05/2021

5.4.2 Measuring the pH value

1 Perform the preparatory activities according to section 5.4.1.
2 Immerse the pH electrode in the test sample.
pH
6.949
15.03.2014
Menu
08:00
3 Select the pH or mV display with
The stability control function (AutoRead) continually checks the stability
of the measurement signal. The stability has a considerable impact on
the reproducibility of measured values.
The measured parameter flashes on the display
 as soon as the measured value is outside the stability range
 when the automatic Stability control is switched off.
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.
1 Freeze the measured value with
The [HOLD] status indicator is displayed.
The HOLD function is active.
25.0
°C
USB output
<MODE>
Stability during the time
interval
Δ : better than 0.01 pH
Δ : better than 0.5 °C
<HOLD>
Operation
.
.
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