wtw pHotoFlex, Operating Manual

Page: 53 / 111

pHotoFlex / pHotoFlex Turb Operation
53 ba75491e05 04/2009
4.6.3 Measuring the ORP voltage
Note
ORP electrodes are not calibrated. However, you can check ORP elec-
trodes using a test solution.
AutoRead
(drift control)
The AutoRead function (drift control) continually checks the stability of
the measurement signal. The stability has a considerable impact on the
reproducibility of measured values. The display of the measured pa-
rameter flashes until a stable measured value is available.
Criteria With identical measurement conditions, the following applies:
4.6.4 Settings for pH and ORP measurements
Overview For pH and ORP measurements, the following settings are available in
the Configuration / pH & ORP menu:
z
Measured parameter
z
Calibration record (display, print)
z
Selecting the calibration type
z
Entering the Calibration interval
z
Selecting the Unit for slope
z
Selecting the Temperature unit
z
Reset
1 Perform the preparatory activities according to section 4.6.1.
2 Submerse the ORP electrode in the sample.
3 Press the <M> key (short pressure) repeatedly until the mea-
sured parameter, ORP is selected.
pH & ORP \ ORP
157
mV
25.0
°C
[AR]
01.02.05 15:12
Measured
parameter Reproducibility Response time
ORP voltage better than 1 mV > 30 seconds