Thermo Scientific Orion 320, User Manual

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4-7 Thermo Scientific Orion 320, 350 and 370 PerpHecT
®
LogR
®
Meter User Guide
Note:
Manual calibration can be performed with any user-selected
buffer(s) . The difference between manual buffer values must be between
one and four pH units .
1 . Attach the electrode to the meter .
2 . Press the setup key . Press the yes key until STD (57d) or SET (5E7) is
displayed . Select SET and press the yes key . P1 will be displayed . Use
the scroll (
▲ ▼
) keys to set the user-defined value for the first buffer
and press the yes key to accept the new value . P2 will be displayed .
Use the scroll (
▲ ▼
) keys to set the user-defined value for the second
buffer and press the yes key to accept the new value . Press the mode
key to return to measurement mode .
3 . Press the cal key . The display will show CAL for two seconds . The last
calibration buffer range will be displayed . Use the scroll (
▲ ▼
) keys to
select the SET option . Press the yes key to accept the SET option .
4 . P1 will be displayed . Place the electrode into the first calibration
buffer . When the ready icon is displayed, the user defined buffer value
will be shown . Press the yes key to accept the value .
5 . P2 will be displayed . Place the electrode into the second calibration
buffer . When the ready icon is displayed, the user-defined buffer value
will be shown . Press the yes key to accept the value .
6 . SLP will be displayed for two seconds while the calculated slope is
shown .
7 . Rinse the electrode with distilled water and place it in the sample .
Record the pH directly from the main meter display and temperature
from upper field when the ready icon is displayed or when the electrode
signal is stable .
Manual Calibration