English
Thermo Scientific Orion Star A221
and Star A321 Portable pH Meter
pH
Instruction Sheet
Preparation
Power Source
1. Power adapter (sold separately)
a. Select the appropriate wall socket plug plate.
b Slide off the clear plastic cover from the plug plate.
c. Slide the plug plate into the groove on the back of the
power adapter.
d. Connect the power adapter to the meter and power
outlet.
2. Batteries (included with meter)
a. Select four AA alkaline batteries.
b. Confirm that the meter is powered off.
c. Remove the battery compartment cover – loosen the
screws holding the battery cover, release the top portion
of the battery cover from the meter (use a coin or your
finger) and release the bottom portion of the battery cover.
d. Orientate the batteries as shown in the battery
compartment housing and insert batteries.
e. Replace the battery compartment cover and screws.
DO/
RDO
ATC/
COND
Orion Star A221 &
Star A321 Portable
Use coin
or finger
to lift.
Remove screws
REF
USB
POWER
BNC
RS232
Electrodes and Other Connections
1. Prepare the pH electrode and any other applicable electrodes according to the
directions in the electrode user guide.
2. Connect the appropriate items as labeled on the meter and as shown in the
figure above:
For additional information on meter setup and operation, refer to the reference guide.
The reference guide is on the included CD and available at
www.thermoscientific.com/water.
Orion Star A221 and Star A321 Portable pH Meters
Display Information
Display Icon Description
Shown when the meter is running on AC power.
Shown when the meter has batteries installed.
Indicates data is being sent to a computer or printer.
Indicates data is being sent to the data log.
Shown when an alarm is set and the alarm value is reached.
Indicates the meter is set to be interfaced with a printer or computer via
the RS232 port.
Indicates the meter is set to be interfaced with a printer or computer via the USB port.
Displays the time and date entered in the setup menu.
C
25.0˚
ATC
HOLD
M
100
pH
ready
7.000 pH
0.0mV
BUFFERS: 1.68, …
Displays the current temperature based on the temperature probe reading or
entered temperature value. Shows the origin of the temperature as MAN
(entered temperature) or ATC (temperature probe).
Shown when is pressed and the displayed measurement is frozen.
Indicates a calibration was successfully completed.
Indicates the pH electrode condition as good (two bars), fair (one bar) or bad
(slash through it), based on the last saved calibration and measurement stability.
Indicates a method is in use and the number of the method being used.
Indicates the type of measurement and determines the type of calibration
that will be performed.
Specifies the stability of the electrode as stabilizing or ready.
Shown when the meter is in AUTO-READ mode. The icon will blink while
the reading is stabilizing and stop blinking when the reading is stable and the
measurement is locked on the display.
Displays the measurement value based on the last saved calibration and current
electrode reading. Units are shown to the right of the value.
Shows the raw millivolt reading of the electrode.
Shows the buffer values used for the last saved calibration.
Shows the operator assigned sample ID number. Star A321 meter only.
Shows the operator assigned user ID number. Star A321 meter only.
cal
view log
setup
2
Displays the action that will be performed when f1 is pressed.
Displays the action that will be performed when f2 is pressed.
Displays the action that will be performed when f3 is pressed.
Keypad Display Information
Press the f1, f2 and f3 function keys to perform the action shown above each key
on the display.
Press to turn the meter on.
When the meter is on, press and quickly release to turn the display backlight on or
off or hold down to turn the meter off.
In the measurement mode, press to take a measurement.
In the setup, calibration and other menus, press to escape the current menu and
return to the measurement mode.
In the measurement mode, press to enter the setup menu.
In the setup, calibration and other menus, press to scroll up through a list of options.
In the continuous measurement mode, press to freeze the displayed measurement and
press again to unfreeze the measurement .
In the setup, calibration and other menus, press to scroll left through a lis t of options.
In the measurement mode, press to change the displayed measurement mode. Options
are pH, mV, RmV (relative mV ) and ORP.
In the setup, calibration and other menus, press to scroll right through a list of options.
In the measurement mode, press to log or print a measurement.
In the setup, calibr ation and other menus, press to scr oll down through a lis t of options.
Orion Star A221 and Star A321 Portable pH Meters
Keypad
1. Press to power the meter on. When the meter is on, press and quickly release to turn the
backlight on or off or press and hold
2. Press
to exit any meter function and return to the measurement mode.
3. The f1, f2, and f3 function keys perform a variety of meter operations. The menu-specific operation is
shown above each key. For example, press f1 in the measurement mode to start a calibration.
4. The
, , or keys are used as navigation keys (up, right, down, left) when selecting
from a fixed list or grid of meter options. In the measurement mode, these keys are used to access the
setup menu, change the measurement mode, manually log or print a measurement and hold (freeze) a
displayed measurement.
for about three seconds to power the meter off.
3
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