Thermo Scientific Orion 320, User Manual

Page: 53 / 67

7-5 Thermo Scientific Orion 320, 350 and 370 PerpHecT
®
LogR
®
Meter User Guide
1 . After the self-test is complete, the meter will return to the measurement
mode . Keep all of the electrodes disconnected from the meter and keep
the BNC shorting cap attached to the BNC input on the meter . Press
the mode key until the pH mode indicator is displayed . The main
display should read a steady 7 .00 ± 0 .02 .
a . If the display does not read a steady 7 .00 ± 0 .02, press the cal key .
The display will show CAL for two seconds .
b . Press the scroll (
▲ ▼
) keys until 7 is displayed and then press the
yes key to accept the calibration range . When the ready icon is
shown, press the yes key .
c . SLP will be displayed while 100 .0 (or the previous calibration slope
value) is displayed . Set this value to 100 .0 using the scroll (
▲ ▼
)
keys . Press the yes key to save the slope value .
d . The meter should advance to the pH measurement mode and the
display should read a steady 7 .00 ± 0 .02 .
2 . In the measurement mode, press the mode key until the meter displays
the rel mV icon . The display should read 0 .0 ± 0 .2 rel mV .
a . If the display does not read 0 .0 ± 0 .2 rel mV, press the cal key . The
display will show CAL for the entire calibration .
b . When the ready icon is shown, use the scroll (
▲ ▼
) keys to set the
rel mV reading to 0 .0 rel mV . Press the yes key to save the value .
c . The meter should advance to the rel mV measurement mode and
the display should read 0 .0 ± 0 .2 rel mV .
3 . In the measurement mode, press the mode key until the meter displays
the mV icon . The display should read 0 ± 1 mV . If the meter does not
read 0 ± 1 mV with the BNC shorting cap attached to the BNC input,
contact Technical Support .
370 Meter Check-Out