6
tandard in which a meter/electrode system are
d
are
match the ORP value.
4.2 Millivolt (mV) Offset Adjustment
Oxidization Reduction Potential (ORP or Redox) is not a precise
measurement, but is useful as a relative indicator. As such, mV offset
adjustment is not meant to enhance accuracy, but rather to make
readings comparable to a reference. Commercial ORP solutions are
often used as a check s
verified to be close to a given value, instea of being used as a
calibration standard in which adjustments
made in an attempt to
1)
Connect an ORP electrode and press
as needed to select
(or R.mV).
mV
2)
Dip the ORP electrode into a solution with a known mV value
(i.e. Zobel, Light’s, quinhydrone, or iodidetriiodide) and stir.
3)
Press
when the reading is stable
he prima
display shows
the relative millivolt value (R.m ) whi
he secon ry display sho
factory default mV value.
Adjust the R.mV value using
. T
ry
V
le t
da
ws
the
)
or
. Press
4
to accept or
to cancel. The meter allows an adjustable maximum value of
150
±
mV from the factory default mV value.
es
mV.
Note:
When an offset has been stored successfully, R.mV replac
5.
CONDUCTIVITY AND TDS CALIBRATION
5.1 Automatic or Manual Calibration
The PC 700 is capable of automatic or manual calibration for
conductivity, and manual calibration for TDS.
In the automatic calibration mode, the meter will automatically se
one of (4) conductivity calibration standard values depending on the
range and normalization temperature being used (
TABLE 1
).
lect
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