Thermo Scientific Orion Star A113 User manual

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DO
Display Icon Description
MEAS Indicates that the meter is in the measurement mode.
SETUP Indicates that the meter is in setup mode.
CAL Indicates that the meter is the calibration mode.
MAN Shown when a manual calibration (Winkler titration) is being done.
AUTO Shown during water-saturated air calibration. Default setting.
Shows the battery status (more bars = more power remaining).
Blinks when power is low and the battery needs to be changed.
(Batteries included and factory-installed with the portable meter Orion Star A123 DO meter.)
Shown when the meter is running on AC power.
(Adapter included with the benchtop meter Orion Star A113 DO meter.)
Shown when the meter is on AUTO-READ mode. Default setting. AR and unit of measurements
will blink until the reading is stable. When the reading is stable it is held on the screen and AR is
lit. Press to take a new reading.
READY Unit of measurement will blink until the reading is stable.
When the reading is stable, READY is lit.
Appears during and after a calibration has been performed.
Displayed when a reading is stored into the memory.
Displayed when viewing stored readings.
Secondary display Shows temperature reading in measurement mode and setup menu in setup mode.
Primary display Measured value in selected mode.
Instructions Located below the primary display. These phrases aid in the setup menu and calibration modes.
Preparation
1. Power source:
a. Power adapter (included with Orion Star A113 benchtop DO meters,
sold separately for Orion Star A123 portable DO meters) – Select the
appropriate wall socket plug. Slide off the clear plastic cover, and slide
on the plug plate into the groove on the back of the adapter.
b. Batteries (factory installed on Orion Star A123 portable DO meters,
sold separately for Orion Star A113 benchtop DO meters) – Select
four AA batteries. Confirm that the meter is off and remove the
battery compartment cover. Insert batteries as shown in the battery
compartment housing.
2. Prepare the DO probe according to the probe instructions. In general:
a. Unscrew the membrane cap from the DO probe, fill the membrane
cap about ¾ full with polarographic electrolyte solution and screw the
membrane cap onto the DO probe.
b. Connect the DO probe to the meter and allow the probe to polarize for
about 30 to 60 minutes.
Note: A DO reading of zero and no change in temperature indicates that the
DO probe is not fully connected to the meter. Disconnect the DO probe and then
firmly reconnect the DO probe to the meter.
3. Prepare the calibration sleeve or BOD bottle.
a. For the calibration sleeve, remove the cap from the sleeve and remove the
sponge from the cap. Wet the sponge with distilled water and squeeze out
excess water. Reassemble the calibration sleeve and insert the DO probe.
b. For a BOD bottle, fill the bottle with about 50 mL of distilled water. Insert
the DO probe into the BOD bottle. Use a Thermo Scientific Orion BOD bottle
adapter if the DO probe does not fit directly into the bottle. Make sure that
the probe is suspended about half an inch above the distilled water and
there is no water on the surface of the DO probe membrane.
4. Connect the appropriate item as labeled on the meter and as shown in Figure 1.
Overview
1. To turn on or off the meter, press .
2. To exit any meter function, press to return to the measurement mode.
3. The meter mode is shown at the top of the meter:
MEAS – for measurement mode
SETUP – for setup mode
CAL – for calibration mode
4. The meter can be calibrated using water-saturated air or using the Winkler titration
method for a manual calibration.
5. Press to switch between reading in % saturation, mg/L, solution
temperature or membrane temperature. (“m” will appear in front of the
membrane temperature reading.)
Thermo Scientific Orion Star A113
Benchtop & Star A123 Portable DO Meters
Instruction Sheet
English
IS-267280-001 Rev. B 06-11
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Display Information
Figure 1

DO
Entering Barometric Pressure
Dissolved oxygen readings are dependent on barometric pressure. This needs to be entered
manually as mm Hg. 1 mm Hg = 0.03937 inch Hg = 1.3332 hPA (mBar) = 0.01934 PSI.
1. In DO measurement mode, press setup.
2. Press three times so that the top line reads “PRES”.
3. Press or to enter the barometric pressure in mm Hg.
Note: Holding the button down will make the value change faster.
4. Press to save configuration and to return measurement mode.
Entering Salinity Correction Value
Since the presence of dissolved salts limits the amount of oxygen that can dissolve in
water, the correction value can be manually entered. The meter default has a salinity
correction factor of 0. If this value needs to be changed, enter the salinity of the sample in
parts per thousand (ppt)
1. In DO measurement mode, press setup.
2. Press four times so that the top line reads “SALT”.
3. Press or to enter the salinity in ppt.
Note: Holding the button down will make the value change faster.
4. Press to save configuration and to return measurement mode.
DO Calibration using Air
1. Press to display the unit “% Sat” or “mg/L” in DO mode.
2. Make sure the DO probe is connected to the meter and fully polarized.
3. Prepare the calibration sleeve or BOD bottle. Insert the DO probe and wait five minutes
for equilibrium. Press .
4. “CAL” will appear in the upper right of the display. Wait for “READY” to appear and %
Sat to stop blinking. The meter will display 102.3 % saturation and will proceed to the
measurement mode.
DO Measurement
1. Check the barometric pressure and if needed, change the value for barometric pressure
correction in setup menu 1.0.
2. Press to display DO readings in % saturation or mg/L (units of measurement).
3. Rinse the DO probe with distilled water and blot dry. Place into the sample and stir gently.
4. If the meter is in AUTO-READ mode (meter default), press .
If the meter is in continuous read mode, the meter will immediately start taking
readings.
Record the DO result and temperature of the sample when “READY” is displayed and the
unit of measurements stops blinking.
Note: If in AUTO-READ mode and memory storage is enabled, the reading will
automatically be stored when the “AR” appears.
If in continuous read mode and memory storage is enabled, press to store into the
meter’s memory.
5. Remove the DO probe from the sample, rinse with distilled water and blot dry.
To continue taking measurements, place the probe into the next sample, stir gently
and repeat step 4.
6. When finished measuring all samples, store probe according to the probe instructions.
DO Calibration Selection
This meter can be calibrated using water-saturated air
or the Winkler titration method for a manual calibration.
Air calibration is the default setting on the meter. For
calibration using Winkler titration, refer to the user
reference guide on the included CD.
1. In DO measurement mode, press setup.
2. Press five times so that the top line reads
“CALT”.
3. Press to select the calibration type as AIR for
water-saturated air calibration or MAN for a manual
calibration (Winkler titration).
4. Press to save configuration and to
return measurement mode.
Read Type Selection
1. In measurement mode, press setup.
2. Press in setup until “4.0” is shown on the top
line and “READ” is shown on the lower line.
Press .
3. Press or to select the measurement mode:
CONT = Continuous
AUTO = AUTO-READ™
4. Press to save selection. Press the key to
return to measurement mode.
Orion Star A113 Benchtop and Orion Star A123 Portable DO Meters
Memory Feature
This meter stores up to 50 readings.
To enable memory storage:
1. In measurement mode, press the “Setup” key.
2. Press to show “5.0” on the top line and “LOG”
on the lower line. Press .
3. Press to show “ON” on the second line. Press
to save selection.
4. Press to return to measurement mode.
In Auto-Read mode, readings are automatically stored
into memory after each stable reading (when “AR”
stops blinking and “READY” appears).
In continuous read mode, when the reading is stable
and “READY” appears, press to store into the
meter’s memory.
Viewing Stored Readings
1. In measurement mode, press .
2. Press or to scroll through the memory points.
3. Press to review the reading stored at that
point.
4. Press key to return to measurement mode or
to view additional stored readings.
English
Keypad Information
In the measurement screen: Press to take a measurement.
In the setup screen: Press to escape the setup menu.
In the calibration screen: Press to abort calibration.
Press to turn the meter on or off.
In the measurement screen:
Press to switch between modes.
In the setup screen:
Press to confirm the selection.
Press to enter the calibration mode. Press to enter the setup mode.
In the measurement screen:
Press to store the data on the screen in
continuous read mode and with data logging
on.
In the setup screen:
Press to scroll up in the list of options.
In the measurement screen:
Press to see the stored data.
In the setup screen:
Press to scroll down in the list of options.
For additional setup menu information, refer to the reference guide. The reference guide is on the included CD
and available at www.thermoscientific.com/water.