Page 1
Thermo Scientific Orion Star A112 Benchtop and
Star A122 Portable Conductivity Meters
Reference Guide
Page 2
Ross and the COIL trade dress are trademarks of Thermo Fisher Scientific, Inc. and
its subsidiaries.
AQUAfast, AQUASensors, BOD AutoEZ, ionplus, KNIpHE, LogR, No Cal, ORION, perpHect,
PerpHecT, pHISA, pHuture, Pure Water, Sage, ROSS, ROSS Ultra, Sure-Flow, Titrator PLUS, and
TURBO2 are registered trademarks of Thermo Fisher Scientific, Inc. and its subsidiaries.
A+, All in One, Aplus, AUTO-BAR, AUTO-CAL, Auto-ID, AUTO-READ, AUTO-STIR,
Auto-Test, AutoTration, CISA, digital LogR, DuraProbe, EZ Startup, ISEasy,
Low Maintenance Triode, Minimum Stir Requirement, MSR, NISS, Optimum Results, Orion Dual
Star, Orion Star, SAOB, SMART AVERAGING, SMART STABILITY, Star LogR, Star Navigator 21,
Stat Face, Triode are trademarks of Thermo Fisher Scientific, Inc. and its subsidiaries.
Guaranteed Success and The Technical Edge are service marks of Thermo Fisher Scientific, Inc.
and its subsidiaries.
© 2011 Thermo Fisher Scientific Inc. All rights reserved. All trademarks are the property of
Thermo Fisher Scientific, Inc. and its subsidiaries.
The specifications, descriptions, drawings, ordering information and part numbers within this
document are subject to change without notice.
This publication supersedes all previous publications on this subject.
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Thermo Scientific Orion Star A112 Benchtop and Star A122 Portable Conductivity Meters
Table of Contents
Chapter 1 Introduction ..........................................................1
Chapter 2 Meter Overview.......................................................3
Connections.......................................................... 3
Display Information ................................................... 4
Keypad Information ................................................... 5
Meter Maintenance ................................................... 5
Chapter 3 Meter Setup ..........................................................7
Navigating the Setup Menu ............................................ 7
Setup Examples....................................................... 9
Read Type Selection ...............................9
Entering the Nominal Cell Constant for Conductivity.......9
Adjusting the TDS Factor............................9
Chapter 4 Calibration and Measurement .........................................11
Conductivity Calibration and Conductivity/TDS Measurement ............ 11
Conductivity Calibration ...........................11
Conductivity /TDS Measurement ....................11
Temperature Measurement and Calibration ............................. 12
Temperature Measurement.........................12
Temperature Calibration ...........................12
Chapter 5 Data Storage and Review .............................................13
Automatic Datalog with AUTO-READ™ Mode........................... 13
Manual Datalog with Continuous Read Mode ........................... 13
Viewing Stored Readings (the Data Log) ............................... 13
Chapter 6 Customer Services ...................................................15
Meter Error Codes.................................................... 15
Troubleshooting Guide................................................ 16
Assistance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Warranty and Registration ............................................ 16
WEEE Compliance ................................................... 16
Declaration of Conformity ............................................. 17
Meter Specifications................................................. 18
Ordering Information ................................................. 19
Chapter 7 Appendix............................................................ 21
T emperat ure Compensa t ion and Ref erence Temperature. .2 1
Total Dissolved Solids (TDS)........................21
Automatic Conductivity Calibration...................22
Table o f Conductiv ity Standard V alues v s. Temperature . . .22
Notes...............................................................24
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Chapter 1 Introduction
Thank you for your purchase of the Orion Star A112 benchtop conductivity or Star A122 portable conductivity meter.
These meters are capable of measuring conductivity in µS/cm or mS/cm; TDS in mg/L; and temperature in °C or °F.
The Orion Star A112 benchtop conductivity meters are IP54-rated. The Orion Star A122 portable conductivity meters
feature a waterproof, IP67-rating.
Please read this reference guide thoroughly. Any use outside of these instructions may invalidate your warranty and
cause permanent damage to the meter.
Thermo Scientific Orion Star A112 Benchtop and Star A122 Conductivity Portable Meters
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Chapter 2 Meter Overview
Connections
1. Power source:
a. Power adapter (included with Orion Star A112 benchtop conductivity meters, sold separately for Star
A122 portable conductivity 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 (included with and factory installed on Star A122 portable conductivity meters, sold separately
for Star A112 benchtop conductivity meters) – Select four AA batteries. Confirm that the meter is off
and remove the battery compartment cover. On the Star A122 portable meter, to remove the battery
compartment cover:
i. Loosen the screws.
ii. Release the top portion of the battery compartment from the meter (using a coin or your finger.)
iii. Release the bottom portion of the battery compartment (using a coin or your finger). Insert
batteries as shown in the battery compartment housing.
Orion Star A112 Benchtop
Push down on tab and lift the
battery cover
Orion Star A122 Portable
Remove screws
2. Prepare the conductivity probe according to the directions in the conductivity probe user guide. In general, this includes
rinsing the cell with distilled water.
3. Connect the appropriate item as labeled on the meter and as shown in figure 1:
Figure 1
Thermo Scientific Orion Star A112 Benchtop and Star A122 Conductivity Portable Meters
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Display Information
Display Icon Description
MEAS
SETUP
CAL
MAN
AUTO
READY
Indicates that the meter is in the measurement mode.
Indicates that the meter is in setup mode.
Indicates that the meter is the calibration mode.
Shown when a manual calibration is being done.
Shown when automatic calibration buffers are used (100 S/cm, 1413 S/cm or 12.9 mS/cm).
Shows the battery status (more bars = more power remaining).
Blinks when power is low and the battery needs to be changed.
(Orion Star A122 Conductivity portable meter includes factory-installed batteries.)
Shown when the meter is running on AC power.
(Orion Star A112 Conductivity benchtop meter includes adapter.)
Shown when the meter is on AUTO-READ mode. Default setting. AR and unit of measure 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.
Unit of measurement will blink until the reading is stable. When the reading is stable, READY is lit.
Appears during calibration and after a calibration is done.
Displayed when a reading is stored into the memory.
Secondary
display
Primary display
Instructions
4
Displayed when viewing stored readings.
Upper display which shows temperature reading in measurement mode and setup menu in setup mode.
Larger, lower display showing measured value in selected mode.
Located below the primary display. These phrases aid in the setup menu and calibration modes.
Thermo Scientific Orion Star A112 Benchtop and Star A122 Portable Conductivity Meters
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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.
Press to enter the calibration mode. Press to enter the setup mode.
In the measurement screen:
Press to switch between modes.
In the setup screen:
Press to confirm the selection.
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.
Meter Maintenance
For routine meter maintenance, dust and wipe the meter with a damp cloth. If necessary, warm water or a mild water-
based detergent can be used. Meter maintenance can be performed on a daily, weekly or monthly basis, as required by
the environment in which the meter is operated. Immediately remove any spilled substance from the meter using the
proper cleaning procedure for the type of spill.
In the measurement screen:
Press to see the stored data.
In the setup screen:
Press to scroll down in the list of options.
Thermo Scientific Orion Star A112 Benchtop and Star A122 Conductivity Portable Meters
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Thermo Scientific Orion Star A112 Benchtop and Star A122 Portable Conductivity Meters
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Chapter 3 Meter Setup
Pressing will take you to the setup menu.
Navigating the Setup Menu
A complete chart showing the main setup levels and submenus is shown after these steps.
1. In the setup menu, press
2. Press
3. For main setup options with more than one submenu:
1.0 Configuration
5.0 Datalog Clear
For main setup options with one submenu:
2.0 General Meter Setup
to enter into the submenu options.
a. Press
b. Press
c. Press
d. Press
or until the desired submenu is shown.
to enter into the submenu.
or until the desired option is shown.
to save your selection.
or until the desired main setup level is shown on the top (secondary display) line.
3.0 Temperature Settings
4.0 Read Type
6.0 Calibration Data
7.0 Factory Reset
a. Press
b. Press
4. Press
Thermo Scientific Orion Star A112 Benchtop and Star A122 Conductivity Portable Meters
or until the desired option is shown.
to save your selection.
to exit the setup menu and return to measurement mode.
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Meter Setup
Setup Menu
Level
Main 1.0 CONF Configuration Select temperature coefficient, TDS factor, cell
Submenu COEF 0.0 to 10.0 Linear Temperature
Submenu TDSF 0.00 to 10.00 TDS Factor 0.49 is the default.
Submenu CELL 0.001 to 10.00 Conductivity Cell
Submenu TREF 20.0, 25.0 Conductivity Reference
Main 2.0 GEN General Meter Setup Automatic meter shut-off
Submenu AUTO ON, OFF Automatic Meter Shut-
Main 3.0 TEMP Temperature Settings Select temperature units and the temperature
Submenu UNIT DEGC, DEGF Temperature Unit The default setting is for temperature readout to
Submenu DEGC or
Main 4.0 READ Read Type
Submenu READ AUTO, CONT AUTO is for AUTO-READ.
Main 5.0 LOG Datalog Clear
Submenu DATA ON, OFF To enable data storage The default is off.
Secondary
Display
DEGF
Primary
Description Information
Display
Compensation Coefficient
Constant
Tem peratur e
Off
-5.0 to 105.0 Manual Temperature
Compensation Value
CONT is for continuous
read.
constant and reference temperature information.
2.1 is the default.
Used for conductivity automatic calibration with
a Thermo Scientific Orion conductivity standard.
Default is 0.475.
25.0 is the default.
To save battery life, the meter will turn off after
15 minutes without button presses. On is the
default setting.
used for manual temperature compensation
be displayed in °C.
This value is used when there is no ATC probe
connected, and can be set with the meter’s
temperature ranges. The temperature unit for
this value will match the temperature unit already
selected. The default setting is 25.0°C.
In AUTO-READ mode, the meter will display the
measurement as it stabilizes and lock and hold the
measurement when it is stable. Press
take a new measurement.
In Continuous read mode, the meter will
continuously measure and update the display. The
unit of measure will flash. When the reading has
been stable, “READY” will stop flashing.
The default setting is AUTO-READ.
to
Submenu DEL LAST, ALL, NO Clears stored readings in
the datalog.
Main 6.0 CAL Calibration Data
Submenu CLR NO, YES Clears the calibration data. The default is no.
Main 7.0 RST Factory Reset
Submenu RST NO, YES Returns all meter settings
to the factory defaults and
deletes all stored data
(calibration and datalog).
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Thermo Scientific Orion Star A112 Benchtop and Star A122 Portable Conductivity Meters
The default is no.
"NO" does not delete any readings.
"LAST" deletes only the last reading.
"ALL" deletes all of the logged data.
The default is no. Before selecting yes, please
make sure any data that you would like to keep
has been recorded.
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Setup Examples
Read Type Selection
1. In measurement mode, press .
2. Press
lower line. Press
3. Press
CONT = Continuous
AUTO = AUTO-READ™
Note: In AUTO-READ mode, the meter will display the measurement as it stabilizes and lock and hold the
measurement when it is stable. AR and unit of measure will blink until the reading is stable. When the
reading is stable it is held on the screen and AR is lit.
Press
In Continuous read mode, the meter will continuously measure and update the display. The unit of
measure will flash. When the reading has been stable, “READY” will appear. This read type is useful
when performing an experiment that requires continuous measurements to be taken, regardless of the
measurement stability.
4. Press
three times in setup until “4.0” is shown on the top line and “READ” is shown on the
.
or to select the measurement mode:
to take a new measurement.
to save configuration and to return measurement mode.
Entering the Nominal Cell Constant for Conductivity
1. Press to enter the setup mode.
2. Press three times to enter the 1.0 configuration menu and the submenu for cell constant.
3. Press
Note: Holding the button down will make the value change faster.
4. Press
or to enter the cell constant value to use for automatic calibration.
to save configuration and to return measurement mode.
Adjusting the TDS Factor
The default value is 0.49.
1. In measurement mode, press
2. Press
3. Press or to enter the TDS factor.
Note: Holding the button down will make the value change faster.
4. Press to save configuration and to return measurement mode.
two times (“TDSF” is displayed on the top line).
.
Thermo Scientific Orion Star A112 Benchtop and Star A122 Conductivity Portable Meters
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Thermo Scientific Orion Star A112 Benchtop and Star A122 Portable Conductivity Meters
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Chapter 4 Calibration and Measurement
Conductivity Calibration and Conductivity/TDS Measurement
Conductivity Calibration
The single-point calibration can be done automatically or manually with your standard. Automatic calibration can be done
using Thermo Scientific Orion conductivity standards at 100 S/cm, 1413 µS/cm or 12.9 mS/cm.
1. Make sure the conductivity probe is connected to the meter, and the cell constant has been confirmed (or adjusted if
needed) in the setup menu.
2. Select the conductivity standard closest to the expected sample conductivity. The meter will use the cell constant
value entered in the setup menu for automatic calibration.
3. Rinse the conductivity probe with distilled water, and insert into the standard and stir gently. Press
4. “CAL” will appear in the upper right of the display. Wait for “READY” to appear.
5. If “AUTO” appears at the top middle of the display. This indicates the automatic calibration mode and the standard
was recognized. Press
measurement mode.
6. If “MAN” appears at the top next to “CAL”, this indicates a manual calibration mode.
a. Press
b. Press
to measurement mode.
or to adjust the value to match your standard.
to view the calculated cell constant and after 2 seconds the meter will proceed to
to view the calculated cell constant and after 2 seconds the meter will proceed
.
Conductivity /TDS Measurement
To measure TDS, confirm the TDS factor is correct and adjust if necessary in the setup menu. The same steps below can
be followed with the units being mg/L.
1. Press
Note: The units will be μS/cm or mS/cm. The meter will auto-range to select the appropriate unit).
to display readings in conductivity.
2. Rinse the conductivity probe with distilled water and blot dry. Insert the probe into the sample and stir gently.
3. If the meter is in AUTO-READ mode (meter default), press
will immediately start taking readings. Record the result and temperature of the sample when “READY” is displayed
and the unit of measurement 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
4. Remove the conductivity 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 3.
5. When finished measuring all samples, store probe according to the probe instructions.
Thermo Scientific Orion Star A112 Benchtop and Star A122 Conductivity Portable Meters
. If the meter is in continuous read mode, the meter
to store into the meter’s memory.
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Temperature Measurement and Calibration
The Orion Star A112 benchtop conductivity and Star A122 portable conductivity meter show temperature on the
top, secondary display. To read only temperature and see the temperature on the primary, lower display, follow the
instructions below.
Temperature Measurement
1. In the measurement mode, press to display the temperature value on the primary display. (The temperature
value at the top, secondary display will match that of the lower, primary display field.)
2. Rinse with probe with distilled water, blot dry and place into the sample. If the meter is in AUTO-READ mode (meter
default), press
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
the meter’s memory.
3. Remove the probe from the sample, rinse with distilled water and blot dry. To continue taking measurements, place
the probe into the next sample and repeat steps 2 and 3.
4. When finished measuring all samples, store probe according to probe instructions.
. If the meter is in continuous read mode, the meter will immediately start taking readings.
to store into
Temperature Calibration
The meter temperature display has a relative accuracy of ± 0.1 °C. Temperature probes may have varying temperature
accuracies, usually ± 0.5 °C to ± 2 °C. Use this function only if it is necessary to calibrate the temperature readings. Since
the temperature offset calculated during the calibration is applied to all future temperature measurements, recalibrate if
a different probe is used.
1. In the measurement mode, press
2. Rinse the probe and NIST-traceable thermometers with distilled water, blot dry and place into a solution with a
known, stable temperature.
Note: It is recommended that two NIST-traceable thermometers be used to measure and verify the temperature of the
solution.
Press
.
3. Wait for the readings to stabilize (about 5 to 10 minutes) and “READY” to stop flashing. The meter will display
the original temperature read by the probe. Press or keys to enter the temperature value read by the
thermometer.
Note: The calculated offset will be applied to all future temperature readings. To abort, press
saving and return to the measurement mode.
to display the temperature reading.
to end without
4. When finished, press
12
to save and end calibration.
Thermo Scientific Orion Star A112 Benchtop and Star A122 Portable Conductivity Meters
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Chapter 5 Data Storage and Review
Orion Star A112 benchtop conductivity and Star A122 portable conductivity meters have a 50-point datalog memory.
Automatic Datalog with AUTO-READ™ Mode
1. In measurement mode, press .
2. Press
3. Press or to show “AUTO” on the second line. Press to save selection.
4. Press
5. Press to show “ON” on the second line. Press to save selection.
6. Press
The reading will automatically be stored in the datalog.
three times until “4.0” is shown on the top line and “READ” is shown on the lower line. Press .
to show “5.0” on the top line and “LOG” on the lower line. Press .
to return to measurement mode. Each time the reading is locked onto the screen with the “AR” icon.
Manual Datalog with Continuous Read Mode
1. In measurement mode, press .
2. Press
3. Press or to show “CONT” on the second line. Press the “Mode/enter” key to save selection.
4. Press
5. Press to show “ON” on the second line. Press to save selection.
three times until “4.0” is shown on the top line and “READ” is shown on the lower line. Press .
to show “5.0” on the top line and “LOG” on the lower line. Press .
6. Press
7. In the measurement mode, press to store the reading into the meter’s memory.
to return to measurement mode.
Viewing Stored Readings (the Data Log)
1. In measurement mode, press .
2. Press
3. Press to review the reading stored at that point.
Thermo Scientific Orion Star A112 Benchtop and Star A122 Conductivity Portable Meters
or to scroll through the memory points.
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Thermo Scientific Orion Star A112 Benchtop and Star A122 Portable Conductivity Meters
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Chapter 6 Customer Services
Meter Error Codes
Display Reason Solution
Calibrated cell
constant is out
of range.
Memory is full The meter will automatically change to the submenu to clear the datalog (“CLR” on the top line,
The cell constant is not in the range of 0.001 to 199.0 cm-1. Clean the conductivity probe according to
the probe user guide. Re-calibrate the probe with new standards.
“NO” on the second).
If the existing memory’s data is still needed:
1. Press
2. In measurement mode, press and then 4 times. (“5.0” appears on the top line.)
3. Press
4. Press to save the change and delete the data accordingly.
If the existing memory’s data can be deleted:
1. P r es s
2. Press
to return to the measurement mode and . Record the memory’s data.
. Press to delete the last reading or press to delete all readings.
change to “YES”.
to clear the datalog.
Thermo Scientific Orion Star A112 Benchtop and Star A122 Conductivity Portable Meters
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Troubleshooting Guide
Problem: The display freezes and the measurement values will not change.
Solution: The meter is in the AUTO-READ measurement mode (the AR icon appears solid on the left of the display).
Assistance
Press
Problem: How do I abort a calibration?
Solution: Press abort any meter operation and return to the measurement mode.
Problem: The meter does not recognize the conductivity standard during calibration.
Solution: Verify that the default cell constant was entered in the setup menu. The cell constant is usually printed on
the conductivity probe cable. Verify that the conductivity standard is one that is programmed into the meter.
Re-calibrate with a fresh standard.
Problem: The measurement is out of range when it should be in range.
Solution: Check that the conductivity probe is fully immersed in the solution. Verify that the cell constant is correct for
the conductivity probe that is connected to the meter.
After troubleshooting all components of your measurement system, contact Technical Support. Within the United States
call 1.800.225.1480 and outside the United States call 978.232.6000 or fax 978.232.6031. In Europe, the Middle East
and Africa, contact your local authorized dealer. For the most current contact information, or the latest application and
technical resources for Thermo Scientific Orion products, visit www.thermoscientific.com/water.
to start a new reading or select continuous read mode to have readings update constantly.
Warranty and Registration
To register your new meter and for the most current warranty information,
visit www.thermoscientific.com/water.
WEEE Compliance
This product is required to comply with the European Union’s Waste Electrical & Electronic Equipment (WEEE) Directive
2002/96/EC. It is marked with the symbol above.
Thermo Fisher Scientific has contracted with one or more recycling/disposal companies in each EU Member State and
this product should be disposed of or recycled through them. Further information on compliance with these directives,
the recyclers in your country, and information on Thermo Scientific Orion products that may assist the detection of
substances subject to the RoHS Directive are available at www.thermoscientific.com.
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Thermo Scientific Orion Star A112 Benchtop and Star A122 Portable Conductivity Meters
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Declaration of Conformity
Manufacturer: Thermo Fisher Scientific Inc.
Hereby declares that the following products:
Benchtop meters are rated 100 to 240 VAC, 50/60 Hz, 0.5A.
Handheld meters use four non-rechargeable AA batteries.
Benchtop Meters Portable Meters
Orion Star A111 pH Orion Star A121 pH
Orion Star A112 Conductivity Orion Star A122 Conductivity
Orion Star A113 DO Orion Star A123 DO
Equipment Class:
Measurement, control and laboratory
Orion Star A-series meters are EMC Class A
Conforms with the following directives and standards:
EN61326-1:2006 Electromagnetic Compatibility (EMC Directive)
Electrical equipment for measurement,
control and laboratory use - EMC requirements
EN61010-1:2001 Safety Standards
UL61010-1:2004 Safety requirements for electrical equipment for measurement,
CAN/CSA C22.2 No. 61010-1-04 control and laboratory use - general requirements
Cheow Kwang Chan
QA/Regulatory Manager
Place and Date of Issue:
June 15, 2011
Singapore
Thermo Scientific Orion Star A112 Benchtop and Star A122 Conductivity Portable Meters
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Meter Specifications
Meter Operating Conditions
Operating Ambient Temperature 5 to 45 °C
Operating Relative Humidity 5 to 85 %, non-condensing
Storage Temperature -20 to +60 °C
Storage Relative Humidity 5 to 85 %, non-condensing
Pollution Degree 2
Overvoltage Category II
Weight Portable: 450g
Benchtop: 850g
Size Portable: 5.9 cm (H) x 10.5 cm (W) x 23.1 cm (D)
Benchtop: 9.3 cm (H) x 18.0 cm (W) x 23.6 cm (D)
Regulatory and Safety CE, TUV 3-1, FCC Class A
Power Rating DC Input: 9 VDC 1A
Battery: 4 x AA
Shock and Vibration Vibration, shipping/handling per ISTA #1A Shock, drop test in packaging per ISTA #1A
Warranty 3 years meter replacement
Universal Power Adapter Operating Conditions
Operating Ambient Temperature 0 to 50 °C
Operating Relative Humidity 0 to 90 %, non-condensing
Storage Temperature -20 to +75 °C
Storage Relative Humidity 0 to 90 %, non-condensing
Pollution Degree 2
Overvoltage Category II
Meter Parameter Specifications
Conductivity
Range 0.1 uS/cm to 200 mS/cm
Resolution 0.01uS Minimum;
3 significant figures minimum
Relative Accuracy 0.5% reading ±1 digit
Reference Temperature 20 °C or 25 °C (default)
Compatible Cell Constants 0.001 to 10.00
Number of Calibration Points 1
TDS
Range 1 to 19,999 ppm
Resolution 4 significant digits
Relative Accuracy 0.5% reading ±1 digit
TDS Factor Range Linear 0.01 to 10.00
Tem peratur e
Range -5 to 105°C
Resolution 0.1
Relative Accuracy ±0.1
Offset Calibration 1 point
Memory 50 points
Note: Specifications subject to change without notice.
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Thermo Scientific Orion Star A112 Benchtop and Star A122 Portable Conductivity Meters
Page 23
Ordering Information
Benchtop meters include electrode arm.
Kits contain meter, probe and appropriate calibration and fill solutions.
Portable meter kits include a carrying case.
CML # Description
STARA1110 Orio n S TAR A111 B enchtop pH Meter
STARA1115 Orio n S TAR A111 B enchtop pH Meter Kit
STARA1120 Orion STAR A112 Benchtop Conductivity Meter
STARA1125 Orion STAR A112 Benchtop Conductivity Meter Kit
STARA1130 Orion STAR A113 Benchtop Dissolved Oxygen Meter
STARA1135 Orion STAR A113 Benchtop Dissolved Oxygen Meter Kit
STARA1210 Orion STAR A121 Portable pH Meter
STARA1215 Orion STAR A121 Portable pH Meter Kit
STARA1220 Orion STAR A122 Portable Conductivity Meter
STARA1225 Orion STAR A122 Portable Conductivity Meter Kit
STARA1230 Orion STAR A123 Portable Dissolved Oxygen Meter
STARA1235 Orion STAR A123 Portable Dissolved Oxygen Meter Kit
STARA-BEA Benchtop electrode arm for Orion Star A-series meters
STARA-HB Freestanding Base for use with Orion Star A-series benchtop electrode arm
STARA-CS Hard Carrying Case for Orion Star A-series Portable Meters
STARA-AR Armor for Orion Star A-series Portable Meters, includes electrode holders for
STARA-ESPH pH Electrode Holder for Orion Star A-series Armor
STARA-ESCD Conductivity and DO Probe Holder for Orion Star A-series Armor
9157BNMD Orion Triode 3-in-1 pH/ATC Probe, Refillable, epoxy body
9107BNMD Orion Triode 3-in-1 pH/ATC Probe, Gel-filled, epoxy body
011050MD Orion 2-Electrode Conductivity Cell, K=1.0
083005MD Orion Polarographic DO probe , 1.5m cable
pH, conductivity and DO probes
Thermo Scientific Orion Star A112 Benchtop and Star A122 Conductivity Portable Meters
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Thermo Scientific Orion Star A112 Benchtop and Star A122 Portable Conductivity Meters
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Chapter 7 Appendix
Temperature Compensation and Reference Temperature
The Orion Star A112 benchtop conductivity and Star A122 portable conductivity meters have the ability to use a
temperature compensation feature that calculates and displays the conductivity measurements at a reference
temperature of 20 °C or 25 °C. The closer the sample temperature is to the selected reference temperature, the more
accurate the conductivity measurement will be.
The conductivity of a solution with a specific electrolyte concentration changes with temperature and this relationship is
described by the temperature coefficient of the solution. The meter has a default temperature coefficient of 2.1 percent
change in conductivity per ˚C, which is representative of many aqueous samples.
Ultra Pure Water 4.55
Salt (NaCl) 2.12
5% NaOH 1.72
Dilute Ammonia 1.88
10% HCl 1.32
5% Sulfuric Acid 0.96
98% Sulfuric Acid 2.84
Sugar Syrup 5.64
Total Dissolved Solids (TDS)
The Orion Star A112 benchtop conductivity and Star A122 portable conductivity meters measure TDS as the total amount
of dissolved inorganics in a solution. The dissolved inorganics carry a current that is measured by the conductivity
probe. Since there is a direct relationship between conductivity and TDS, conductivity readings are used to estimate the
presence of inorganics. The user must enter a TDS factor between 0.01 and 10 mg/L in the setup menu.
The standard method of determining TDS involves evaporating a sample to dryness at 180 ˚C and weighing the residue.
The TDS factor is calculated by taking the residue weight and dividing it by the sample conductivity. Subsequent
conductivity readings are multiplied by the TDS factor to determine the TDS value of the sample.
Automatic Conductivity Calibration
The Orion Star A112 benchtop conductivity and Star A122 portable conductivity meters are capable of automatically
recognizing 100 S/cm, 1413 S/cm and 12.9 mS/cm conductivity standards when the nominal cell constant of the
conductivity probe is entered in the setup menu.
Thermo Scientific Orion Star A112 Benchtop and Star A122 Conductivity Portable Meters
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Table of Conductivity Standard Values vs. Temperature
Cat. No. 011005 011006 011007 01100910 011008
111.9 mS/cm
Temperature
(°C)
Conductivity
Standard
(mS/cm)
0 65.10 7.135 776 81 54
1 66.84 7.344 799 83 56
2 68.59 7.555 822 86 58
3 70.35 7.768 846 88 59
4 72.12 7.983 870 91 61
5 73.91 8.200 894 93 63
6 75.70 8.418 918 96 64
7 77.50 8.638 943 98 66
8 79.32 8.860 968 101 68
9 81.15 9.084 992 103 70
10 82.98 9.309 1017 106 72
11 84.83 9.535 1043 108 73
12 86.69 9.763 1068 111 75
13 88.56 9.993 1094 114 77
14 90.45 10.22 1119 116 79
15 92.34 10.46 1145 119 81
16 94.24 10.69 1171 122 83
17 96.15 10.93 1198 125 85
18 98.08 11.16 1224 127 87
19 100.0 11.40 1251 130 88
20 102.0 11.64 1277 133 90
21 103.9 11.88 1304 136 92
22 105.9 12.12 1331 138 94
23 107.9 12.36 1358 141 96
24 109.9 12.61 1386 144 98
25 111.9 12.85 1413 147 100
26 113.9 13.10 1441 150 102
27 115.9 13.35 1468 153 104
28 117.9 13.59 1496 156 106
29 120.0 13.84 1524 159 108
30 122.0 14.09 1552 161 110
31 124.1 14.34 1580 164 112
32 126.2 14.59 1608 167 114
33 128.3 14.85 1636 170 117
34 130.4 15.10 1665 173 119
12.9 mS/cm
Conductivity
Standard
(mS/cm)
1413 µS/cm
Conductivity
Standard
(µS/cm)
147 µS/cm
Conductivity
Standard
(µS/cm)
100 µS/cm
Conductivity
Standard
(µS/cm)
22
Thermo Scientific Orion Star A112 Benchtop and Star A122 Portable Conductivity Meters
Page 27
Cat. No. 011005 011006 011007 01100910 011008
Temperature
(°C)
111.9 mS/cm
Conductivity
Standard
(mS/cm)
12.9 mS/cm
Conductivity
Standard
(mS/cm)
1413 µS/cm
Conductivity
Standard
(µS/cm)
147 µS/cm
Conductivity
Standard
(µS/cm)
100 µS/cm
Conductivity
Standard
(µS/cm)
35 132.5 15.35 1693 176 121
36 134.6 15.61 1722 179 123
37 136.7 15.86 1751 182 125
38 138.9 16.12 1780 185 127
39 141.0 16.37 1808 188 129
40 143.2 16.63 1837 191 131
41 145.4 16.89 1866 194 134
42 147.6 17.15 1896 197 136
43 149.8 17.40 1925 200 138
44 152.0 17.66 1954 203 140
45 154.2 17.92 1983 206 142
46 156.4 18.18 2013 209 145
47 158.7 18.44 2042 212 147
48 160.9 18.70 2071 215 149
49 163.2 18.96 2101 219 151
50 165.4 19.22 2130 222 154
Thermo Scientific Orion Star A112 Benchtop and Star A122 Conductivity Portable Meters
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Notes
24
Thermo Scientific Orion Star A112 Benchtop and Star A122 Portable Conductivity Meters
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9 0 0 1 : 2 0 0 8
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