Thermo Scientific Orion Star A220 Series User Manual page 23

Thermo Scientific
Mode and Settings Menu for pH Channel
Use the Mode and Settings menu to customize settings for the pH channel of Orion Star A221
pH meters. Default meter settings are bold.
Parameter Settings
· pH
· mV
Measure Mode
· RmV
· ORP
· Auto
Read Type
· Continuous
1 Decimal Place
Resolution
2 Decimal Places
(pH only)
3 Decimal Places
Buffer Group
· USA
· DIN
(pH only)
Cal Due Alarm
· Cal Due Alarm
(pH, RmV and
ORP only)
Buffer Group Setting
Orion Star A221 pH meters are capable of automatically recognizing pH buffer values within the
selected buffer set during a pH calibration. During the pH calibration, the meter uses the
selected pH buffer set and the raw mV reading of the pH electrode in the buffer to recognize
and display the buffer value at the measured temperature. The raw mV reading of the pH
electrode in the buffer must be within one pH unit (approximately ±59 mV) of the buffer's
theoretical mV value for the meter to recognize the buffer.
USA Buffer Set
pH Buffer mV range
1.68 +255 mV to +374 mV
4.01 +117 mV to +236 mV
7.00 -59 mV to +59 mV
10.01 -237 mV to -119 mV
12.46 -382 mV to -264 mV
Details
Set the displayed measurement mode, the selected
mode determines which additional settings are shown
and the type of calibration the meter will perform
Set the read type to determine how the meter takes a
measurement and when the measurement is sent to
the data log and/or external device
0.1
0.01
Set the resolution of the pH measurement value
0.001
Set the buffer group for automatic buffer recognition
during pH calibrations
USA: pH 1.68, 4.01, 7.00, 10.01 and 12.46 buffers
DIN: pH 1.68, 4.01, 6.86 and 9.18 buffers
Set the calibration due alarm off or on, when the
alarm is on, the fixed calibration time interval is 12
On
hours and the alarm is triggered after 12 hours has
elapsed without a calibration being performed
pH Buffer
1.68
4.01
6.86
9.18
Orion Star A220 Series Portable Meter User Manual
Chapter 3 Meter Setup Menus
|
DIN Buffer Set
mV range
+255 mV to +374 mV
+117 mV to +236 mV
-51 mV to +67 mV
-189 mV to -70 mV
|
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