Xylem inoLab 7110 WASTEWATER pH METER - Manual (Page 27)

pH 7110 ORP
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6 ORP
6.1 Measuring
6.1.1 Measuring the ORP
1. Connect the ORP electrode to the meter.
2. If necessary, call up the measured parameter U with <M>.
3. Immerse the ORP electrode in the test sample.
The measured value is checked for stability (stability control).
The [AR] status display flashes.
4. Wait for a stable measured value.
The [AR] display indicator no longer flashes.
Stability control (AutoRead )
During the measuring procedure, the stability control function is automatically
activated.
The stability control function (AutoRead) continually checks the stability of the
measured values in the monitored time interval. The stability has a consider-
able impact on the reproducibility of measured values. The [AR] display indi-
cator flashes until a stable value is measured.
Stability criteria (AutoRead )
6.1.2 Measuring the temperature
The temperature measurement is absolutely essential for a reproducible ORP
measurement.
3
6
1
8
2
4
U
°C
TP
mV
AR
3
Measured parameter Time interval Stability in the time interval
ORP 15 seconds Δ mV: Better than 0.3