Chapter 2
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Meter Basics
Measurement Display Icons
Display Icon
Description
Shown when the meter is running on AC power
Shown when the meter is running on battery power
Indicates when data is exported to a computer or printer
Indicates when a measurement is recorded in the data log
Shown when an alarm is set and the alarm is triggered
Indicates the RS232 port is selected for printer or computer interfacing
Indicates the USB port is selected for printer or computer interfacing
Displays the active temperature measurement and indicates the source as an
ATC temperature sensor (ATC) or manually entered temperature value (MAN)
Shown when the hold key is pressed and displayed measurements are frozen,
press the hold key a second time to release the hold function
Indicates a calibration has been successfully completed, flashes when the
calibration alarm is set and the alarm is triggered
Indicates the pH electrode condition as good (two bars), fair (one bar) or bad
(slash through it), based on the last saved calibration and electrode stability
Stability indicator will flash stabilizing while the measurement is changing and
show ready when the measurement is stable
When the read type is set to Auto-Read, the icon will flash while the reading is
stabilizing and remain solid when the reading is stable and locked on the display
pH Electrode Condition Icon
Orion Star A221 pH meters include a pH electrode condition icon. In the measurement mode,
the pH electrode condition icon indicates the performance of the pH electrode, based on the
last saved calibration and electrode measurement stability.
Icon
pH Electrode Status
Electrode condition is good. The electrode slope is in the range of 95.1% to 104.9%.
Electrode condition is fair. The electrode slope is 85.1% to 95% or 105% to 114.9%.
Electrode condition is bad. The electrode slope is 85% or lower or 115% or higher. Consult the
pH electrode manual for instructions on how to clean, condition and troubleshoot the electrode.
Note: This is a general indicator of overall electrode status – always refer to the pH electrode
user manual for specific information on the recommended slope range for each pH electrode.
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Orion Star A220 Series Portable Meter User Manual
Thermo Scientific
Summary of Contents for Orion Star A220 Series
Page 5: ......
