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26
For pH 300 and pH 302:
The display will indicate the absolute mV value
(positive or negative).
When values are less
than ±400 mV, tenths of
mV are displayed; for
values greater than
±400 mV, the decimal
digit disappears. Note that the change in
scale (from 0.1 mV to 1 mV as resolution) is
automatic.
For pH 301:
The display will indicate
the ppm value expressed
in ppm or mV (depend-
ing on the measured
sample). Note that the
change in scale (from 0.001ppm to 0.01ppm or
0.1 ppm as resolution) is automatic.
For all models:
"---" appears if the value
exceeds ±1999 mV (out
of range).
When not in use, the tip
of the electrode should be kept moist and
safe from any mechanical stress which might
cause damage to the junction.
VIEWING THE ION CALIBRATION FAC-
TOR ON THE LCD (for pH 301 only)
Press ION followed
by CAL DATA and
the meter will display
the last ION cali-
bration data.
Press UP or DOWN to get
this information in the fol-
lowing sequence:
Rel mV
°C
°C
ppm
Rel mV
CAL DATA
ION
°C
°C
Note that the change in scale (from 0.1 mV
to 1 mV as resolution) is automatic.
For all models:
"---" appears if the value
exceeds ±1999 mV (out
of range).
Oxidation-reduction potential (REDOX) mea-
surements provide the quantification of the
oxidizing or reducing power of the sample
tested.
To correctly perform a redox measurement,
the surface of the ORP electrode must be
clean and smooth.
When not in use, the tip of the electrode
should be kept moist and safe from any me-
chanical stress which might cause damage
to the gold/platinum junction.
TAKING ION MEASUREMENTS
pH 300, pH 301 and pH 302 have the capabil-
ity to take ION measurements. An optional
ISE electrode must be used to perform these
measurements.
For pH 300 or pH 302:
To get into the mV mode (ORP
or ISE), press RANGE.
For pH 301:
To get into the ION mode, press
ION.
Simply submerge the ISE
electrode tip (4 cm/1½") into
the sample to be tested. Al-
low a few minutes for the read-
ing to stabilize.
Rel mV
RANGE
ION
4 cm
(1
½
")