Horiba Scientific DS-72G, Instruction Manual

Page: 82 / 106

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7.1.3 Measured by USP (Stage 2)
1.
Select the USP in the COND pharmacopeia
mode screen.
2.
Tap on the right of the Stage 2 item.
3.
Before measurement, set the temperature
conversion to OFF in accordance with the
regulation prescribed by USP, and the setting of
the unit is automatically changed to S/cm.
The changed settings are applied.
4.
Tap to proceed to the next procedure.
5.
Immerse the COND electrode in sample solution
and tap
to start the measurement.
When measurement is completed, the conduc-
tivity of the sample solution and the measure-
ment condition are displayed as a measurement
result.
Tap
to return to the COND pharmaco-
peia mode screen.
In this mode the value when the measured
temperature is at 25

C ±1

C and the
conductivity change for 5 minutes is 0.1

S/cm
or less is judged whether it exceeds the
evaluation standard, 2.1

S/cm or not.