Thermo Scientific Star A326 User manual

Thermo Scientific Orion Star A326
Portable pH/RDO/DO Meter
Instruction Sheet
pH /
RDO / DO
English
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.
Electrodes and Other Connections
1. Prepare the pH electrode, RDO optical dissolved oxygen probe or
polarographic dissolved oxygen probe 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.
DO/
RDO
ATC/
COND
POWER
USB
REF
RS232
BNC
Remove screws
Orion Star A326
Portable
Use coin
or finger
to lift.

Orion Star A326 Portable pH/RDO/DO Meters
2
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.
25.0˚C
ATC
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).
HOLD 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.
M
100 Indicates a method is in use and the number of the method being used.
pH Indicates the type of measurement and determines the type of calibration that will be performed.
ready 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.
7.000 pH Displays the measurement value based on the last saved calibration and current electrode reading.
Units are shown to the right of the value.
0.0mV Shows the raw millivolt reading of the electrode. pH mode only.
BUFFERS: 1.68, … Shows the buffer values used for the last saved calibration. pH mode only.
Auto Baro Press : 757.3 Shows the barometric pressure measured by the meter (Auto) or entered by operator (Man.) and used to correct
dissolved oxygen measurements. RDO/DO modes only.
Salt: 0.0 Displays the salinity correction factor used to correct dissolved oxygen measurements. RDO/DO modes only.
Shows the operator assigned sample ID number.
Shows the operator assigned user ID number.
cal Displays the action that will be performed when f1 is pressed.
sample ID Displays the action that will be performed when f2 is pressed.
channel Displays the action that will be performed when f3 is pressed.
Display Information

Orion Star A326 Portable pH/RDO/DO Meters
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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 for about three seconds to power the meter off.
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.
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 list of options.
In the single channel measurement modes, press to change the displayed measurement
mode. Options for channel 1 are pH, mV, RmV (relative mV), ORP and ISE. Options for
channel 2 are %sat (dissolved oxygen in percent saturation), mg/L (dissolved oxygen in
milligrams per liter) or °C (probe membrane temperature).
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, calibration and other menus, press to scroll down through a list of options.
Keypad Display Information

Orion Star A326 Portable pH/RDO/DO Meters
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pH Calibration
One to five pH buffers can be used for calibration. Always use fresh pH buffers and select buffers that bracket
the sample pH and are one to four pH units apart. Prepare the pH electrode according to the instructions in
the electrode use guide. Connect the pH electrode and any other electrodes to be used (ATC probe, reference
electrode) to the meter. Power on the meter and set the measurement mode to pH.
1. In the measurement mode, press f1 (cal). Press or to highlight pH-Channel and press f2 (select).
2. Rinse the pH electrode and any other electrodes in use with distilled water, blot dry with a lint-free tissue
and place into the pH buffer.
3. When the electrode and buffer are ready, press f3 (start).
4. Wait for the pH value on the meter to stabilize and stop flashing and perform one of the following actions:
a. Press f2 (accept) to accept the displayed value.
b. Press f3 (edit) to access the numeric entry screen and edit the value.
i. Press , , or to highlight a number, decimal point or negative sign; press
f3 (enter) to select the highlighted item and repeat until the value at the measured temperature
is shown above the numeric entry screen.
ii. Press f2 (done) to exit the numeric entry screen.
iii. Press f2 (accept) to accept the entered value.
5. Press f2 (next) to proceed to the next buffer and repeat steps 2 through 4 or press f3 (cal done) to save and
end the calibration. If five buffers are used, the calibration will save and end once the fifth value is accepted.
a. If a one point calibration is performed, press f2 (accept) to accept the displayed slope value or press
f3 (edit) to access the numeric entry screen, enter the slope value and press f2 (accept).
6. The meter will display the calibration summary including the average slope. Press f1 (meas) to export
the data to the calibration log or press f2 (print) to export the data to the calibration log and a printer or
computer. The meter will automatically proceed to the measurement mode.
pH Buffer Group Selection
The selected buffer group allows for the automatic recognition of certain pH buffers during a pH calibration.
The USA buffer group includes pH 1.68, 4.01, 7.00, 10.01 and 12.46 buffers and the DIN buffer group includes
pH 1.68, 4.01, 6.86, and 9.18 buffers.
1. In the measurement mode, press .
2. Press , , or to highlight pH Channel and press f3 (select).
3. Press or to highlight Mode and Settings and press f3 (select).
4. Press or to highlight Buffer Group and press f3 (select).
5. Press or keys to highlight USA or DIN and press f3 (select).
6. Press to return to the measurement mode.

Orion Star A326 Portable pH/RDO/DO Meters
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RDO/DO Calibration
Polarographic DO probes only - A polarographic DO probe must be polarized. The probe is continuously
polarized when it is connected to the meter. If the probe is not connected to the meter: connect the probe to the
meter, connect the meter to a power source and wait 30 to 60 minutes for polarization.
The Orion Star A326 meter can perform a calibration using water-saturated air (Air), air-saturated water
(Water), Winkler titration (Manual) or zero point calibration (Set Zero). See the reference guide for detailed
instructions for each calibration.
Air Calibration
1. In the measurement mode, press f1 (cal). Press or to highlight DO-Channel and
press f2 (select).
2. Press or to highlight Air and press f3 (select).
3. Rinse the RDO optical DO probe or polarographic DO probe with distilled water, blot dry with a lint-free
tissue and place into the prepared calibration sleeve or BOD bottle. Allow the probe and water-saturated
air to reach equilibrium.
4. When the probe and water-saturated air are ready, press f3 (start).
5. Wait for the dissolved oxygen reading on the meter to stabilize and stop flashing. Once the reading is stable,
the meter will display Accepting Auto % Sat. Calibration and 100.0 % if using an RDO optical DO probe
or 102.3 % if using a polarographic DO probe.
6. Press f3 (cal done) to export the data to the calibration log or press f2 (print) to export the data to the
calibration log and a printer or computer. The meter will proceed to the measurement mode.
Set Zero Calibration
A zero point calibration is performed in an oxygen-free solution. A zero point calibration is not generally
required unless measurements will be taken below 10% saturation or 1 mg/L. Perform an air or water
calibration before performing a zero point calibration.
1. In the measurement mode, press f1 (cal). Press or to highlight DO-Channel and
press f2 (select).
2. Press or to highlight Set Zero and press f3 (select).
3. Rinse the RDO optical DO probe or polarographic DO probe and any other electrodes in use with distilled
water, blot dry with a lint-free tissue and place into the prepared zero oxygen standard. Allow the probe and
standard to reach equilibrium.
4. When the probe and zero oxygen standard are ready, press f3 (start).
5. Wait for the dissolved oxygen reading on the meter to stabilize and stop flashing. Once the reading is stable,
the meter will display Accepting Auto % Sat. Calibration and 0.00.
6. Press f3 (cal done) to export the data to the calibration log or press f2 (print) to export the data to the
calibration log and a printer or computer. The meter will proceed to the measurement mode.

Orion Star A326 Portable pH/RDO/DO Meters
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Measurement
The Orion Star A326 meter is capable of showing two measurements simultaneously on the display. The
first channel can be set to measure pH, mV, RmV (relative mV) or ORP. The second channel can be set to
measure DO -%sat (dissolved oxygen in percent saturation), DO - mg/L (dissolved oxygen in milligrams
per liter) or DO -°C (probe membrane temperature).
The meter can be set to display one or both of these measurement channels, depending on the operator’s
needs. In the measurement mode, press f3 (channel) to scroll through a single measurement display of
channel one or two or a dual measurement display of channel one and two. To change the measurement
mode of a channel, press f3 (channel) until the single measurement display of that channel is shown
and then press until the correct mode is shown.
Note: It is highly recommended that any unused channels not be shown on the meter display while
taking measurements, since the meter waits for all displayed channels to stabilize before logging the
measurement data.
Press while taking a measurement in the continuous measurement mode to freeze the display and
press a second time to unfreeze the display and continue the measurement. Press while taking
a measurement to manually export the measurement to the data log, if the data log is enabled in the
setup menu.
1. Rinse the pH electrode, RDO optical dissolved oxygen probe or polarographic dissolved oxygen probe and
any other electrodes in use with distilled water, blot dry with a lint-free tissue and place into the sample.
2. Start the measurement and wait for it to stabilize.
a. If the meter is in AUTO-READ mode (default setting), press to start the measurement. When
the icon stops flashing, record the applicable measurement parameters and temperature of the
sample. Press again to start a new measurement.
b. If the meter is in continuous mode, the meter will immediately start taking a measurement and
update the display whenever the measurement changes. Wait for the display to show ready and
record the applicable measurement parameters and temperature of the sample.
c. If the meter is in timed mode, the meter will log measurements at the preselected time interval,
regardless of the measurement stability. The meter will update the display whenever the
measurement changes, so the applicable measurement parameters and temperature of the sample
can be recorded when the display shows ready.
3. Remove the electrodes from the sample, rinse with distilled water, blot dry and place into the next sample.
4. Repeat steps 2 and 3 for all samples.
5. When all samples have been measured, store the electrodes according to their user guides.

Orion Star A326 Portable pH/RDO/DO Meters
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Setup Menu Overview
pH Channel DO Channel Settings Log View Diagnostics
Method
Mode & Settings
tMeasure Mode
tRead Type
tResolution
tBuffer Group
tStability
tAveraging
tAlarm Settings
Temperature
tManual Temp Value
tTemperature Unit
tTemperature
Calibration
tTemperature Input
Method
Mode & Settings
tMeasure Mode
tMeasure Unit
tResolution
tRead Type
tBaro Press
tSalinity Correct
tStability
tAveraging
tAlarm Settings
Temperature
tManual Temp Value
tTemperature Unit
tTemperature
Calibration
tTemperature Input
tExport Data
tData Log
tDate / Time
tLanguage
tKey Press Beep
tAlarm Beep
tContrast
tAuto Shut Off
tUser ID
tSample ID
tData Log
tCalibration
Log
tMeter Self Test
tFactory Reset
tAbout Meter
Read Type Selection
1. In the measurement mode, press .
2. Press , , or to highlight pH Channel or DO Channel and press f3 (select).
3. Press or to highlight Mode and Settings and press f3 (select).
4. Press or to highlight Read Type and press f3 (select).
5. Press or to highlight Auto, Continuous or Timed and press f3 (select).
a. If Timed is selected and the time interval needs to be changed – highlight Timed; press to highlight
hours (HH), minutes (MM) or seconds (SS); press f3 (edit) to access the numeric entry screen; use the
numeric entry screen to change the values and press f1 (back) when the time interval is correct.
6. Press to return to the measurement mode.

Orion Star A326 Portable pH/RDO/DO Meters
DO Probe Type Selection
The Orion Star A326 meter accepts and automatically recognize Orion RDO optical dissolved oxygen probes
and Orion polarographic dissolved oxygen probes. If a different probe is used or the probe type needs to be
verified, perform the following steps.
1. In the measurement mode, press .
2. Press , , or to highlight DO Channel and press f3 (select).
3. Press or to highlight Mode and Settings and press f3 (select).
4. Press or to highlight Measure Mode and press f3 (select).
5. Press or to highlight DO (polarographic probe) or RDO (RDO optical probe) and press f3 (select).
6. Press to return to the measurement mode.
Viewing the Calibration Log
1. In the measurement mode, press .
2. Press , , or to highlight View Log and press f3 (select).
3. Press or to highlight Calibration Log and press f2 (accept).
4. Press or to highlight pH – Channel or DO – Channel and press f2 (select).
5. Press or to highlight pH,RmV or ORP (pH - Channel) or DO or RDO (DO- Channel) and press f2
(select).
6. The meter will display a list of calibrations for the selected channel and calibration type. The list shows the
sequential number of the calibration and the date and time it was saved (07/01/2011 12:45).
7. To view the calibration data, press or to highlight a specific calibration and press f2 (select).
Press f2 (print) to print the calibration, press f3 (info) to view the electrode slope between pH buffer points
(pH - Channel only) or press f1 (back) to return to the list of calibrations.
8. Press to return to the measurement mode.
Viewing the Data Log
1. In the measurement mode, press .
2. Press , , or to highlight View Log and press f3 (select).
3. Press or to highlight Data Log and press (accept).
4. Press or to highlight pH – Channel or DO – Channel and press f2 (select).
5. The meter will display a list of the data points. The list shows the sequential number of the data point and
the date and time the data point was saved (07/01/2011 12:45).
6. To view the measurement information for an individual data point, press or to highlight the data
point and press f2 (select). Press f2 (print) to print the data point or press f1 (back) to return to the list of
data points.
7. Press to return to the measurement mode.
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