Thermo Scientific Orion 320, User Manual

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3-7 Thermo Scientific Orion 320, 350 and 370 PerpHecT
®
LogR
®
Meter User Guide
1 . To perform a LogR calibration, the LogR function must first be enabled
in setup menu . Press the setup key . Press the yes key until the LogR
icon is shown . Press the scroll (
▲ ▼
) keys until on is displayed . Press
the yes key to enable the LogR function . Press the mode key to exit the
setup menu . When the LogR function is enabled, the LogR icon will
be shown while the meter is in the measurement mode .
2 . In the measurement mode, press the mode key until the meter shows
the LogR icon and CAL on the main display . Press the yes key to begin
the LogR temperature calibration sequence . The last LogR calibration
type (1-PT, 2-PT or 3-PT) will be shown on the display . 2-PT is the
default setting . Use the scroll (
▲ ▼
) keys to change calibration type
and then press the yes key .
3 . The display will show CAL 1 in the main readout . The measured
temperature value, based on the last calibration, will be displayed . Place
the PerpHecT or ROSS PerpHecT pH electrode into a temperature-
controlled pH buffer or tap water solution . Measure the temperature
of the solution using a NIST-traceable thermometer . When the LogR
signal stabilizes, the ready icon will be shown .
4 . Adjust the temperature value using the scroll (
▲ ▼
) keys . Press the yes
key to accept the value .
5 . If a two point calibration was selected, CAL 2 will be displayed on
the main readout . Follow steps 3 and 4 to set the second temperature
value . Repeat the same steps if a three point calibration is selected .
6 . The meter will proceed to the pH measurement mode after accepting
the final temperature value .
Note: . . A calibration may be aborted before saving the final calibration
point by pressing the mode key . This will cause the system to display
ESC, proceed to pH mode and retain to the previous LogR temperature
calibration data .
LogR Calibration