Starter Series - Pacific Laboratory Products

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Starter Series
Electrodes and Meters
Ingeniusly Practical
Electrodes and Meters for pH, ORP, Conductivity, DO and Temperature
Contents
4
Starter Series pH/ORP/Conductivity Benchtop Meters . . . . . . . . . . . . 6
Starter Series pH/Conductivity/DO Portable Meters . . . . . . . . . . . . . . 8
Reference Electrodes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
pH Electrodes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
ORP Electrodes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Conductivity Probes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
DO Probes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Temperature Probes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Electrodes Comparative Chart . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Starter Electrodes Selector Guide . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Pen Meters, Starter Series . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Solutions and Buffers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
BR-OHA-ELCMT0118-5
ST5000 pH/ORP Benchtop Meters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
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About the Starter Series
Accurate and precise measurement has been our main focus since our inception in 1907.
After more than a century of developing balances that have provided the reliable and
repeatable weight determination that is essential to laboratory applications, OHAUS is
proud to now offer our expertise in measurement in a line of electrochemistry products.
The Starter Series of electrodes includes pH, reference, oxidation-reduction potential (ORP),
conductivity, dissolved oxygen (DO) and temperature electrodes that can be used in conjunction
with our bench and portable meters. This catalog contains background information on each
electrochemistry substance, information about our electrodes that measure these
substances, as well as buffers and solutions.
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
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Starter Series
pH / ORP Benchtop Meters
Starter ST5000 pH / ORP Bench Meter
Applications
Cost-effective High Performance Bench Meter for universal applications
• Academia
• General Laboratory Use
• Pharmacy
• Water Analysis
ST5000-F
The Starter 5000 provides accurate pH and ORP measurement for high-level experiments and research. Enhanced features, advanced technology, and high performance have been combined to
support complex laboratory tasks requiring pH measurement.
• The Starter 5000’s performance is propelled by a 1000 item library, 10 sensors for calibration storage, 8 predefined and
1 self-defined buffer groups, 3 endpoint modes and GLP mode.
• Advanced Software and Technology Support Complex Applications and Intuitive Operation. Starter 5000 has a user-friendly interface, similar to other smart devices used daily. With a large LCD touchscreen display, users will find themselves intuitively navigating through all applications.
• Enhanced Features Offer Protection & Simple Use of this Advanced Meter — Starter 5000 also has many features that promote
ease of use, convenience, as well as protection, including a standalone electrode arm, IP54 housing and in-use cover.
. . . . . . . . .
. . . . . . . . .
• High resolution
Screen display for easy
monitoring and operation
• IP54 housing protects the meter
from damage by water and dust
particles
• Built-in USB host port to export
data or RS232 to connect a printer
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• 4.3” high-resolution color touchscreen has large digits and well-arranged icons
to facilitate simple operation
Starter ST5000 pH / ORP Bench Meter
ST5000
Model
Package
ST5000-F
Part Number
30129896
Measurement Range
-2.000…20.000 pH, -2000.00…+2000.00 mV, -30°C…130 °C
Resolution
0.1/0.01/0.001pH, 1/0.1/0.01mV, 0.1 °C
Error Limits
± 0.002 pH, ± 0.03% FS mV, ± 0.1 °C
Calibration
1 Point, 4 Predefined Standards
Buffer Group
8 predefined groups, 1 self define group
pH Calibration
1-9 points
Memory
1000 sets, with 10*10 calibration data
Power Supply
110-240V/50-60Hz, 9 V DC
Size/Weight
220 W × 175 D× 78 H mm / 0.55 kg
Display
Color Touch-Screen LCD
Input
BNC, impedance >3*10e+12 Ω, Cinch, NTC 30 kΩ
Output
USB & RS232 for easy data export
Temperature Compensation
ATC and MTC
Housing
ST5000-F Kit
Compatible Electrodes
ABS
ST5000 Meter, stand alone electrode holder, ST5000 in-use-cover,
4G USB-driver
+ ST350, pH buffer powder sachet
ST210, ST230, ST310, ST320, ST350, STMICRO5,
STPURE, STORP1, STORP2, STREF1, STREF2, STTEMP30
Additionally
• 3 end-point modes: manual, auto and time
• Calibration reminder
• Screen Cover
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5
Starter Series
pH / Conductivity / ORP Benchtop Meters
Whether it is a basic or advanced model that you are looking for,
you can rely on Starter Series bench meters to meet your water analysis needs.
Applications • Academic • General Laboratory Use • Food & Beverage • Water Analysis
Starter 2100 pH
Cost-effective and reliable pH Meter for Laboratory Applications
• With the attached quick guide, five clearly marked keys and user-friendly
software, novices can operate the meter with minimal training.
• The built-in electrode holder provides uncomplicated and convenient
all-in-one operation while the large LCD display screen clearly displays
results.
• Auto buffer recognition, electrode condition icon, automatic temperature
compensation and reference input, all work together to ensure accurate
results.
ST2100-F
.............................................................................
Starter 3100 pH/ORP
Best
Seller
Starter 3100 offers premium features at a cost-effective
price point for reliable and convenient pH and ORP
measurements
• Starter 3100’s intuitive software includes three point calibration, three
buffer groups, automatic and manual endpoint functions, as well as a 99
item library.
• Adjustable stand-alone electrode holder + large backlit LCD display.
ST3100-F
• Simple documenting measurement data thanks to the RS232 which can
be used to connect peripheral devices such as printers or computers to
the meter.
.............................................................................
Starter 3100C Conductivity
With plenty of advanced intuitive features, Starter 3100C
is the ideal meter for standard testing of conductivity,
total dissolved solids (TDS) and salinity.
• Starter 3100C’s intuitive software includes 1 point calibration, 4
pre-defined standards, automatic and manual endpoint functions, and
one touch conversion between measurement modes.
ST3100C-F
• Among Starter 3100C’s user-friendly features that support ease-of-use
are an adjustable stand-alone electrode holder and large backlit LCD
display.
• Documenting measurement data is made simple through the RS232
which can be used to connect peripheral devices such as printers or
computers to the meter.
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pH / Conductivity / ORP Benchtop Meters
Model
ST2100
ST3100
ST3100C
Package
ST2100-E
ST2100-F
ST3100-F
ST3100C-F
Part Number
30057495
3005496
30058489
30058731
-2.00…16.00 pH
–1999…1999 mV
-5 °C…110 °C
00.0 μS/cm…199.9 mS/cm
0.1 mg/l…199.9 g/l (TDS)
0.00 ... 19.99 psu (Salinity)
0 °C…100 °C
Measurement Range
0.00…14.00 pH
–1999…1999 mV
0 °C…100 °C
Resolution
0.01 pH
1 mV
0.1 °C
Automatic Range
0.1 °C
Error Limits
± 0.01 pH
± 1 mV
± 0.5 °C
± 0.5 % of the Measured
Value
± 0.3 °C
Calibration
Memory
1 or 2 Points
1 Predefined Buffer Group
(1.68, 4.01, 7.00, 10.01)
Display
Input
1 Point
4 Predefined Standards
99 Measurements
Last Calibration Data
Last Calibration Data
Power Supply
Size/Weight
Up to 3 Points
3 Predefined Buffer Groups
110-240V/50Hz, DC 12V
Approximately 220 W × 175 D × 78 H mm / 0.75 kg
Liquid Crystal
Liquid Crystal Backlight
BNC, impedance > 10e+12 Ω
Cinch, NTC 30 kΩ
2 mm
Mini-DIN
ATC & MTC
Linear: 0.00 %/°C…10.00
%/°C
Reference Temperature: 20
& 25 °C
Temperature Compensation
Housing
ABS
ST2100-E Kit
ST2100-B (2100 Meter With Built-In Electrode Holder)
+ ST210 Electrode, pH Buffer Powder Set (4.01, 7.00, 10.01)
ST2100-F Kit
ST2100-B (2100 Meter With Built-In Electrode Holder)
+ ST210 Electrode, STTEMP30 Temperature Probe, pH Buffer Powder Set (4.01, 7.00, 10.01)
ST3100-F Kit
ST3100-B (3100 Meter With Stand-alone Electrode Holder)
+ ST310 Electrode, pH Buffer Powder Set (4.01, 7.00, 10.01), In-use Cover
ST3100C-F Kit
Compatible Electrodes
(Find the complete range on
page 26)
ST3100C-B (3100C Meter, Stand-Alone Electrode Holder, Conductivity Standards 1413 μS/cm
and 12.88 mS/cm (20 mL Bottles)
+ STCON3 Conductivity Probe (Range 70 μS/cm – 200 mS/cm), In-use Cover
ST210, ST230, ST310 , ST320, ST350, STMICRO5,
STPURE, STORP1, STORP2, STREF1, STREF2, STTEMP30
ST3100
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Starter Series
pH, DO & Conductivity Portable Meters
Low-cost Portable Meters
packed with productive features
• Lightweight design ideal for field testing
• Compact and ergonomic design offers a user
friendly experience
• Clear, well-organized LCD screen
• Reliable calibration results in accurate
measurement screen
Applications
• Academic • General Laboratory Use
• Food & Beverage
• Field Use • Water Analysis
Developed with versatility in mind, these meters can be operated in the lab with the support of the built-in stands or in the field
thanks to their lightweight design. The portable Starter Series also boasts IP54 protection which shields the meter from damage by
water and dust particles and it also offers an integrated labeling area which can be customized for quick identification. Each meter
can store 30 sets of data memory and has the ability to quickly recall calibration data and stored information with one quick touch.
Starter 400D Dissolved Oxygen Meter
ST400D is a practical, affordable, low-maintenance DO portable meter equipped with
optical technology - ideal for applications that require simple yet accurate DO
measurements.
• The optical probe requires minimal maintenance –frequent membrane replacement
not needed. Also, warm up and stirring of samples when taking measurements is not
required.
• Equipped with a color LCD display, the ST400D is designed to fit comfortably in
the palm of your hands. The automatic/manual endpoints enable easy recall of last
calibration data and stored information with one touch.
• Simple calibration process offers quick delivery of measurements, and automatic
temperature and barometric pressure compensation ensure accurate results.
...............................................
Starter 300 pH Meter
Starter 300 marries portability with precise pH measurement. An ORP or temperature
electrode can also be easily connected to provide additional functionality.
• Auto buffer recognition stores calibration data and helps to avoid errors during the
calibration process.
• Automatic and manual temperature compensation helps ensure accurate readings.
ST300-G
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ST400D-G
pH, DO & Conductivity Portable Meters
Starter 300C Conductivity Meter
Starter 300C is the reliable and accurate choice for measurement of the conductivity
and TDS levels of liquids. With a variety of features that protect the meter from more
extreme elements, Starter 300C can be used for a wide variety of applications.
• The 30 item library allows the user to store measurements data, and stored
information and calibration data can be easily recalled with one touch.
• Auto temperature compensation with adjustable temperature co-efficient for accurate
measurements, and 4-pole and 2-pole conductivity probes which offer a large
conductivity range that safeguards them from effects of polarization and pollution.
• With a simple calibration process and quick delivery of measurement results, Starter
300C is efficient and easy-to-use.
* Portable Meters are available in different packages:
ST300-G includes ST300-B, ST320 3-in-1 Plastic Gel pH Electrode, pH Buffer Powder Sachet
(4.01, 7.00, 10.01), Portable Bag
ST300C-G
...............................................
Starter 300D Dissolved Oxygen Meter
Starter 300D provides accurate and reliable DO measurement, critical to aquatic life and
water quality.
• With a simple calibration process, quick delivery of measurements and automatic
temperature compensation, Starter 300D is both easy-to-use and accurate.
• The automatic or manual endpoints allow the user to easily recall the last calibration
data and stored information with one quick touch.
• The galvanic electrode can be used immediately after being powered on without the
wait time typically associated with dissolved oxygen meters.
ST300D-G
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9
pH, DO & Conductivity Portable Meters
Model
ST400D-G
ST300-G
ST300C-G
ST300D-G
Part Number
30208726
30219114
30219115
30219116
Measurement
Range
0.0 to 200.0%
0.00 to 20.0 mg/L(ppm)
0 to 50 °C
0.00…14.00 pH
–1999…1999 mV
0 °C…100 °C
0.0 μS/cm…199.9 mS/cm
0.1 mg/l…199.9 g/l (TDS)
0 °C…100 °C
0.0 to 199.9%; 200 to 400%
0.00 to 19.99; 20.0 to 45.0 mg/L
0.00 to 19.99; 20.0 to 45.0 ppm
0 to 50 °C
Measurement
Resolution
0.1%
0.01 mg/L(ppm)
0.1 °C
0.01 pH
1 mV
0.1°C
Automatic Range
0.1°C
0.1%; 1%
0.1 mg/L; 1mg/L
0.01 ppm; 0.1 ppm 0.1 °C
Barometric
Range
50.0 to 115.0 kPa
NA
375 to 825 mmHg
500 to 1100 mbar
500 to 1100 hPa
Barometric
Resolution
0.1 kPa
NA
1 mmHg, 1 mbar, 1 hPa
Error Limits
± 0.2 mg/L (<8 mg/L),
± 0.3 mg/L (8 to 20 mg/L);
± 0.3 °C ± 1.5 kPa
± 0.01 pH, ± 1 mV, ± 0.5
°C
± 0.5 % of the Measured
Value ± 0.3°C
± 1% ; ± 0.3 °C
Calibration
1 or 2 points
3 Points,
1 Predefined Buffer
Group
1 Point,
3 Predefined Standards
1 or 2 Points,
100% and 0%
Memory
99 Measurements
Last Calibration Data
30 Measurements, Last Calibration Data
Power Supply
4 x AAA (LR03) Batteries,
12 hrs
4 AAA > 500 Operating
Hrs
Size/Weight
Approx. 90 W × 150 D ×
35 H mm / 0.16 kg
(Without Batteries)
Approx. 90 W × 150 D
x 35 H mm / 0.18 kg
(Without Batteries)
Mini-DIN
BNC, Impedance >
10e+12 Ω
Cinch, NTC 30 kΩ
Mini-Din
BNC, Cinch, NTC 30 kΩ
ATC & MTC
ATC,Linear: 0.00 %/°C.
10.00 %/°C
Ref. Temperature: 20 &
25 °C
ATC & MTC
Display
Input
4 AAA > 250 Operating Hours
Approx. 90 W × 150 D
x 35 H mm / 0.16 kg
(Without Batteries)
Liquid Crystal
Temperature
Compensation
ATC
Salinity
Compensation
0.0 to 40.0 ppt
NA
IP Protection
Compatible
Electrodes
0.0 to 50.0 ppt
IP54
Housing
Kit Content
Approx. 90 W × 150 D
x 35 H mm / 0.18 kg
(Without Batteries)
ABS
ST400D-B with STDO21
Optical DO Probe,
Portable Bag
ST300-B*,
ST320 3-in-1 Plastic Gel
pH Electrode,
pH Buffer Powder Sachet
(4.01, 7.00, 10.01),
Portable Bag
ST300C-B*,
STCON3 4-Pole Conductivity Probe
(70 μS/cm - 200 mS/cm),
Portable Bag
ST300D-B* with
STDO11 Galvanic DO Probe,
STTEMP30 Temperature
Probe, Portable Bag
STDO21
ST210, ST230, ST310,
ST320, STPURE,
STTEMP30,
STORP1, STROP2
STCON3
STTEMP30, STDO11
* Meter comes with with IP54 Sets, electrode clip, wrist strap and 4 AAA batteries
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Reference Electrodes
STREF2 is a saturated calomel electrode
(SCE)(Hg/Hg2Cl2 in saturated KCl) which
traditionally was the most widely used
electrode. The disadvantage is it cannot
be used above 50 due to instability of
the Hg2Cl2.
STREF1 is a Silver/Silver Chloride (Ag/AgCl in
Saturated KCl) electrode which has become
the most widely used reference electrode
since the SCE became less popular.
Maintenance of the reference electrode can
help avoid stability problems and keep it in
good working order:
.......................................
Reference Electrodes have a stable and well
defined electrochemical potential (at constant
temperature) against which the applied or
measured potentials in an electrochemical
cell are referred. Therefore, a good reference
electrode is non-polarizable, or will remain
stable upon passage of a small current.
1. Make sure that the reference electrode
compartments are filled with electrolyte
solution.
2. Make sure the junction is not blocked.
STREF2
Model
Part Number
30059254
STREF1
30059253
Description
Saturated Calomel (SCE)
Silver/Silver Chloride ( Ag/AgCl)
E vs. SHE (Standard Hydrogen Electrode) (V)
0.241
0.198
Connector
2mm banana
2mm banana
Dimensions (Shaft)
120 x 12 mm
110 x 12 mm
Cable Length
1m
1m
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11
Basic Theory of pH
pH is one of the most common parameters measured in a wide variety of industries such as water
and wastewater treatment, food and beverage,
agriculture, research and production, environmental monitoring, chemical and life sciences research,
electronics production as well as other industrial
applications.
pH is defined as the negative logarithm of the
molar concentration of the active hydrogen ions
pH = -log [H+].
pH provides a convenient way to compare the
relative acidity or alkalinity of a sample at a given
temperature.
A pH electrode produces different mV in different
solutions.
A perfect pH electrode, at 25˚C, produces a slope
of 59.16mV per 1.00 pH unit and has a value that
ranges between 50 and 58 mV.
Slope = mV /pH unit
Use of Electrodes for
pH Measurement
Measurement is usually done with a combination electrode. The combination electrode is an
electrode system formed by a glass electrode
and a reference electrode.
A potential develops on the membrane surface
when a pH electrode comes into contact with
a sample and its value varies with the pH of the
sample.
This variation in potential is measured in mV by a
meter and is converted to direct pH values
through Nernst Equation.
E = E0 + (2.303RT/nF) logaH+
12
....................................................................................
pH Electrodes
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pH Electrode Structure
Shaft Body Material
Characteristic
Advantage
Glass Shaft
Can withstand high temperatures
and is resistant to corrosive materials
and solvents.
Ideal for laboratory use and
is easy to clean.
Plastic
Shaft
Not recommended for usage at
temperatures above 80 ˚C.
Moderate resistance to highly
corrosive materials and solvents.
Is durable and
not easily broken.
Ref illable vs. Gel
Characteristic
Advantage
Ref illable
Reference electroytes can be
replenished when necessary.
Can be used many
times over.
Gel
The reference electrolyte gel is not
refillable and the electrode must be
replaced when contaminated.
No maintenance
is required.
Reference Junctions Types
Characteristic
Advantage
Ceramic
This standard junction consists of a
porous piece of ceramic which
allows the electrolyte to slowly flow
out of the electrode.
Stable and simple to use.
Annular
Junction
Formulated with a special ceramic
which encircles the glass bulb.
Numerous pores in the ceramic
provide lower resistance and more
stable pH readings.
Not easily blocked and
ideal for muddy samples.
pH Electrodes
Maintenance and Storage of pH Electrodes
pH electrodes are delicate measuring instruments that require proper care
and maintenance to produce accurate and reliable results as well as to
ensure a long useful life.
Always keep the pH electrode moist when not in use by using an electrode
storage solution (3M KCl). DO NOT store the electrode in distilled or deionized water as this will cause ions to leak out of the glass bulb and reference
electrolyte, causing a slow and sluggish response.
Electrodes may be shipped with either protective caps or in electrode
soaking bottles to prevent cracking or scratching and to keep the glass
bulbs moist. Remove the electrode gently from the storage bottle and
rinse it with distilled water before use. For long-term storage, always keep
the electrode in the bottle in enough storage solution to cover the bulb.
Replenish the bottle as needed.
Model
ST350
ST320
ST310
STPURE
ST270
ST272
ST260
ST230
ST210
Part Number
30129354
83033967
83033965
83033969
30240974
30393265
30129357
83033968
83033966
pH Range
0 to 14pH
0 to 13pH
0 to 14 pH
0 to 13 pH
0 to 14pH
2 to 12pH
0 to 14pH
0 to 14 pH
0 to 14 pH
Temp. Range
0 to 100 ºC
0 to 80 ºC
0 to 80 ˚C
0 to 100 ˚C
0 to 100 ºC
0 to 50 ºC
0 to 80 ˚C
0 to 100 ˚C
0 to 80 ˚C
Shaft Material
Glass
Plastic
Plastic
Glass
Glass
Plastic
Glass
Glass
Plastic
Internal Ref.
Type
Ag/AgCl
Ag/AgCl
Ag/AgCl
Ag/AgCl
Ag/AgCl
Ag/AgCl
Ag/AgCl
Ag/AgCl
Ag/AgCl
Gel/Refillable
Ref illable
Non-refillable,
Gel
Ref illable
Ref illable
Non-refillable,
Gel
Non-refillable,
Gel
Ref illable
Ref illable
Ref illable
Reference
Junction Type
Annular ceramic
Fiber pin
Ceramic pin
Ground glass
Annular ceramic
Annular fiber
Ceramic pin
Annular ceramic
Ceramic pin
Refilling
Reference
Electrolyte
3M KCl solution
3M KCl gel
3M KCl solution
3M KCl solution
3M KCl gel
3M KCl gel
Double saltbridge 3M KCl
(AgCl)---Pure KCl
solution
3M KCl solution
3M KCl solution
Dimensions
(Shaft)
120 x 12 mm
120 x 12 mm
120 x 12 mm
120 x 12 mm
120 x 12 mm
120 x 15 mm
120 x 12 mm
110 x 12 mm
120 x 12 mm
Cable Length
1m
1m
1m
1m
1m
1m
1m
1m
1m
Temp. Sensor
Yes
Yes
Yes
NO
NO
NO
NO
NO
NO
Connector
BNC, Cinch
BNC, Cinch
BNC, Cinch
BNC
BNC
BNC
BNC
BNC
BNC
3-in-1 electrode,
with integrated
temperature
probe. Ideal for
high Temp.
3-in-1 electrode
with integrated
temprature
probe for standard or muddy
samples.
General purpose
3-in1 plastic
refillable pH
electrode
suitable
for normal
samples
Glass-body
refillable pH
electrode for
pure
water (distilled
water, rain water
tap water etc.)
Puncture
electrode for
semisolid
samples such as
fruits, meat or
cheese.
2-in-1 plastic
shaft puncture
pH electrode for
semi-solid sam- Tris-buffer
ples: meat, fruits, solution
cheese. Steel
head ensures a
stronger and durable structure.
General purpose
glass-body
refillable pH
electrode
for muddy samples (juice, milk,
wine, etc.)
General purpose
2-in1 plastic gel
refillable pH
electrode.
Suitable
for normal
samples
Description
Used With
OHAUS pH meters with BNC input connector and Cinch
temperature connector
OHAUS pH meters with BNC input
connector
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13
Oxidation-Reduction Potential
(ORP) electrodes test for the overall
availability of electrons in a medium,
specifically the ratio of positive and
negative ions in the solution. They
are also sometimes referred to as
Redox electrodes.
ORP is the only practical method
used to electronically monitor
sanitizer effectiveness and it is also
commonly tested in water, such as
swimming pools and aquariums, in
order to help oxidize contaminants.
ORP is expressed in millivolts (mV).
A range of -1000 mV to 1000mV is
common with most ORP tests.
The pH value influences the ORP
value significantly.
Keeping the electrode clean is very
important in order to keep the
platinum band or disk from
getting contaminated, which can
result in slow response time or
inaccurate measurement.
....................................
ORP Electrodes
STORP2
Model
Part Number
14
30038553
STORP1
30038555
Shaft Material
Glass
Plastic
Temperature Range
0-100 ˚C
0-80 ˚C
Internal Reference Type
Ag/AgCl
Ag/AgCl
Gel/Refillable
Refillable
Non-Refillable, Gel
Reference Junction Type
Annular ceramic
Ceramic pin
Refilling Reference Electrolyte
3M KCl gel
3M KCl gel
Dimensions (Shaft)
120 x 12 mm
120 x 12 mm
Cable Length
1m
1m
Temperature Sensor
NO
NO
Connector
BNC
BNC
Zero Potential Value
86mV±15mV
86mV±15mV
Grade Difference
≥ 165mV
≥ 165mV
Free Call 1800 723 405
Basic Theory of Conductivity
Conductivity is measured in a wide range of
industries and gives a readout of total ionic
concentration within the sample solution.
It’s a rapid and inexpensive way of determining
the ionic strength of a solution.
A basic conductivity cell consists of a pair of electrodes between which the sample is situated. The
ratio of the distance between the electrodes (D)
and their surface area (A) is known as the cell
constant: K:
K= d/A [cm -1]
Every measuring cell has its own particular cell
constant. It is recommended that you always
determine the cell constant exactly by using a
standard to calibrate.
In contrast to a pH electrode, the measuring cell
does not change with time, at least if the sensor is
used properly. The cell constant changes only if the
surface of the electrode changes, for example
through fingerprints, deposits, scratches or
enclosed air bubbles.
The conductivity electrode should be stored dry.
Platinum rings
Main electrode body
Magnitude of induced
current measured by
inner rings
Plastic sheath
Voltage applied to
outer rings
The STCON3 utilizes the 4-Ring potentiometric
method for measuring conductivity, which incorporates a series of four stainless steel rings formed into
the probe shaft. This design completely eliminates
polarization, which occurs with the 2-Plates amperometric method.
Furthermore, without polarization the probe can
measure a wider range of conductivity values
because it does not suffer from electrolysis.
.....................................................................................
Conductivity Probes
The STCON3 conductivity electrode has a built-in temperature
sensor which is 30K. When using STCON3, please consider the
following:
1. Make sure the plastic shield is in place when measuring.
2. Be sure the solution has reached the line on the plastic shield
and below the vent hole when measuring.
3. To prevent carry over from high to low conductivity solutions,
rinse with distilled water between and after measurements.
4. Make sure the cell chamber is bubble-free when measuring.
5. Allow sufficient time for the sensor to stabilize when measuring samples at different temperatures. Manual end-pointing is
advised.
STCON3
Model
Part Number
83033972
Connection
Mini-Din
Cable Length
1.0 m
Shaft Length
130mm
Shaft Diameter
14mm
Temperature Range
0-50 ˚C
Measurement Range
70 µS/cm - 200mS/cm (0.5% accuracy)
2 μS/cm - 70μS/cm (1% to 5% accuracy)
www.pacificlab.com.au
15
Conductivity Probes
.....................................................................................
The newest conductivity probe to join the Starter
Series is a 2-pole potentiometric probe, STCON7.
STCON7 is especially designed for low conductivity
measurements in mediums such as pure or distilled
water. With a built-in 30KΩ temperature sensor, it
performs automatic temperature compensation.
The stainless steel measuring cell chamber can hold
316L.
Operation
For optimal performance, use the same procedure
as described for STCON3 on the previous page.
Moreover, when taking measurements, make sure
the solution is above the cell chamber and remove
any build-up of solids in the chamber.
This can be done by dabbing the probe with cotton
soaked in detergent solution and then rinsing it in
distilled water
Precautions and Limitations
1. Do not expose the shaft to organic solvents when
cleaning or when taking measurements.
2. Do not use the probe outside the recommended
temperature range.
3. Calibrate the electrode with standard solution for
an accurate measurement.
16
Free Call 1800 723 405
STCON7
Model
Part Number
30080693
Connection
Mini-Din
Cable Length
1.0 m
Shaft Length
95mm
Shaft Diameter
12mm
Temperature Range
0-60 ˚C
Measurement Range
0.02 μS/cm - 200μS/cm
(accuracy: 0.02μS/cm)
Basic principle of Dissolved Oxygen (DO) Probes
There are 3 types of commonly used oxygen sensors: polarographic,
galvanic and optical (luminescence) sensors.
STDO11 is a galvanic DO electrode and the the simplest sensor among
the 3 sensors. It produces its own electric current.
The cathode is silver and the anode is zinc. Oxygen passes through the
membrane and is reduced at the cathode to increase the electrical
signal (current) read by the electrode. As oxygen increases, the signal
increases.
The reaction is:
O2 + H2O + Zn = Zn (OH)2
Galvanic sensors are active at all times and will degrade in storage as
well as during use. The galvanic electrode does not need to polarize
(warm up) before calibration or measurement while polarographic
electrodes take
15 minutes to several hours to warm up.
Care and maintenance
Carefully remove the protective bottle from the tip of the electrode by
unscrewing the lid and removing the bottle. Remove the shorting plug
from the connector and store in a safe place. Be careful because the
protective bottle lid is tightly fit on the electrode.
STDO11 should be stored in a moist environment to keep the
membrane from drying out, but do not store directly in water.
STDO11
Model
STDO21
Part Number
30031639
30219117
Connection
BNC
Min-Dini
Cable Length
1.1m
1m
Shaft Length
120mm
125mm
Shaft Diameter
12mm
13mm
Shaft Material
Plastic
ABS
Temperature Range
0-50 ˚C
0-60 ˚C
Measurement Range
0-200%
0.02~20 mg/L
Storage Solution
10% NaCl
.................................................................................
Dissolved Oxygen Probes
Calibration and Measurement
DO probes should be calibrated before being
placed in the sample. Before calibrating a
probe, do not forget to remove water droplets
from the membrane by gently shaking the
sensor.
www.pacificlab.com.au
17
Temperature Compensation
Temperature variations can affect pH measurements. However at pH level 7, temperature will not
have an effect on the potential of the system.
This is known as the ‘isopotential point’.
If automatic compensation is not practical, the
following equation can be used to determine error:
.....................................................................................
Temperature Probes
Magnitude of error = 0.003 pH/˚C/pH unit from pH 7
Note: The temperature compensation here refers
to electrode related temperature variation and not
solution related variations.
STTEMP30 is a standalone sensor that can be used
in conjunction with Starter 3100, 2100, 300 and
300D meters to check for temperature variations.
pH Buffer Solutions
250 ml pH buffer solutions are available in values
of pH 4.01, 7.00, 9.21, 10.01. Select solutions come
in color coded bottles with dispenser tops and
help with instant recognition. These are available
in 250 ml bottles.
Conductivity standards
250 ml Conductivity standard solutions are
available in values of 84μs/cm, 1413μs/cm and
12.88 ms/cm.
Reference Refilling Electrolyte
3M KCl saturated (with AgCl) reference fill
solutions for Ag/AgCl single junction electrodes is
available.
Electrode Storage Solutions
After cleaning or when the electrode is not in use,
always keep pH electrodes in some storage
solution to ensure proper working condition.
18
Free Call 1800 723 405
ST TEMP30
Model
Item Number
83033970
Shaft Material
Stainless steel
Shaft Length
120mm
Temperature Range
0-100 ˚C
Cable Length
1m
Connection
Cinch
Sensor
Type
Model
Description
Shaft
Material
Shaft Dim.
Cable Lenght
Measurement
Temp.
Range, Accuracy Range
ST350
3-in-1 within
temp sensor
glass
refillable
120 × 12mm 1m
0--14pH
0 - 100°C
Normal samples with ATC;
as well as high temperature,
organic etc.
BNC+Cinch
ST320
3-in-1 within
temp sensor
plastic nonrefillable
120 × 12mm 1m
0--13pH
0 - 80°C
Normal samples with ATC
BNC+Cinch
ST310
3-in-1 within
temp sensor
plastic
refillable
120 × 12mm 1m
0--14pH
0 - 80°C
Normal samples with ATC
BNC+Cinch
ST270
Puncture
electrode
glass nonrefillable
120 × 12mm 1m
0--14pH
0 -100°C
Suitable for semisolid samples
such as fruits, meat or cheese.
BNC
ST272
Puncture
electrode
Plastic, Nonrefillable, Gel
120 x 15 mm 1m
2 - 12pH
0 to 50°C
Suitable for semisolid samples
such as meat, fruits or cheese.
BNC
ST260
2-in-1
glass
refillable
120 × 12mm 1m
0--14pH
0-80°C
Tris-buffer solution
BNC
ST230
2-in-1
glass
refillable
110 × 12mm 1m
0--14pH
0 - 80°C
Muddy samples (milk, juice)
BNC
ST210
2-in-1
plastic
refillable
120 × 12mm 1m
0--14pH
0 - 80°C
Normal samples
BNC
STPURE
2-in-1
glass
refillable
120 × 12mm 1m
0--13pH
0 -100°C
low conductivity samples
(pure water, distilled water,
rain water )
BNC
STSURF
2-in-1
plastic
refillable
120 × 12mm 1m
2--12pH
0 - 80°C
Flat surface such as skin, paper etc.
BNC
STMICRO5
2-in-1
glass
refillable
80 × 5 mm 1m
0--14pH
0 -100°C
Mico samples in tube or
microcentrifuge tube
BNC
STMICRO8
2-in-1
glass
refillable
150 × 8 mm 1m
0--14pH
0 -100°C
Mico samples in tube or
microcentrifuge tube
BNC
STREF2
Saturated Calomel glass
(SCE)
refillble
120 × 12mm 1m
NA
0 - 50°C
E vs sHE is 0 241v
2mm
banana
STREF1
Ag|AgCl
glass
refillable
110 × 12mm 1m
NA
0 - 100°C
E vs sHE is 0 198v
2mm
banana
STORP1
Pt disk
plastic nonrefillable
120 × 12mm 1m
-1000mv-1000mv 1mv
0 - 80°C
Normal samples
BNC
STORP2
Pt band
glass
refillable
120 × 12mm 1m
-1000mv-1000mv 1mv
0 - 100°C
Can endure high temperature
and organic solvents
BNC
STCON3
4-pole sensor
with temp sensor
Plastic
130 × 14mm 1m
70μs/cm200ms/cm 0 5%
0 - 50°C
Normal samples
Mini-Din
STCON7
2-pole sensor
with temp sensor
Plastic
95 × 12mm 1m
0 02μs/cm200μs/cm 0 5%
0 - 50°C
Pure water, not fit for
ultrapure water
Mini-Din
STDO11
Galvanic
Plastic
120 × 12mm 1m
0-45mg/L
0 - 50°C
Normal samples, no warm
up needed, no maintenance
BNC
STDO21
Optical
Plastic
125 x 13 mm 1m
0-20 mg/L
0-60°C
Waste water, environmental
monitoring. (lakes, streams, rivers
etc.) Aquaculture systems wine
and beer.
Mini-Din
STTEMP30
NTC 30KΩ
Steel
120 × 3mm 1m
0-100°C
0 5°C
0-100°C
Can work with ST300, ST300D,
ST2100 and ST3100
Cinch
Application Area
Connector
Reference
ORP
Conductivity
Dissolved
Oxygen
Temperature
Electrodes Comparative Chart
pH
Starter
Electrodes
Selector
Guide
Starter
Electrodes
Selector
Guide
pH Electrodes
ST350
ST320
Standard Aqueous samples,
general purpose (e.g. pH buffers)
Waste water
River/lake water
Swimming pool
Tap water/drink water
Pharmaceutical industry water
Distilled water/pure water
pH
measurements
of environmental
and laboratory
samples
Education purpose samples
Strong Acid(not HF)or strong Base
Harsh Environmental solution, e.g
high temperature or corrosive
Drug formulations
Tris-buffer solutions
Suspensions(e.g. ink, soil in water)
Cell culture media
Small container/Tube samples
Microtube samples
Jam/Yoghurt
Vegetable and fruit
Honey
Cream
pH
measurements
of Food and
Beverages etc..
(various liquid
or semi-solid
samples)
Fish/Meat/Poutry
Cheese
Milk
Soy sauce
Beer
Wine
Tea and coffee
fit for this application
partially fit for this application
not fit for this application
3
20
Free Call 1800 723 405
ST310
ST272
ST270
ST260
ST230
ST210
STMICRO8 STMICRO5 STPURE STSURF
Starter Electrodes Selector Guide
pH Electrodes
ST350 ST320 ST310 ST272 ST270 ST260 ST230 ST210 STMICRO8 STMICRO5 STPURE
STSURF
Pesticidea solution
Paint/latex paint
Exemplary
Exemplary daily
daily
use
use chemical
chemical prodproducts
ucts pH
pH measuremeasurements
ments
Water paint
Cosmetics/emulsion
Shampoo/Shower creams/
liquid soups
Meat/Cheese
pH
pH measurement
measurement
on
on surface
surface
Paper
Skin
Agar
Redox(ORP) Electrodes
STORP1
STORP2
Conductivity Probes
STCON3
STCON7
Standard Aqueous samples,
general purpose (e.g. pH buffers)
Waste water
River/lake water
Swimming pool
Tap water/drink water
Pharmaceutical industry water
Distilled water/pure water
pH
pH measurements
measurements
of
of environmental
environmental
and
and laboratory
laboratory
samples
samples
Education purpose samples
Strong Acid(not HF)or strong Base
Harsh Environmental solution, e.g
high temperature or corrosive
Drug formulations
Tris-buffer solutions
Suspensions(e.g. ink, soil in water)
Cell culture media
Small container/Tube samples
Microtube samples
fit for this application
partially fit for this application
not fit for this application
www.ohaus.com
www.pacificlab.com.au
4
21
Pen Meters, Starter Series
Accurate results anywhere and anytime you need them!
The Pen Meters, Starter Series from OHAUS can be
completely operated with just one hand, feeing up
the other hand for sample handling.
With several models designed to measure pH,
Conductivity, ORP (oxidation-reduction potential),
alinity and TDS (Total Dissolved Solids), OHAUS
continue providing solutions for users looking for
accurate measurement at a very competitive price.
pH Meter
Model
Conductivity Meters
ST20
ST20C-C
ST20C-B
ST20C-A
Part Number
30073971
30073977
30073976
30073975
Range
0.00-14.00
0.00-19.99 ms/cm
0-1999 μs/cm
0.0-199.9 μs/cm
Resolution
0.01pH
10 μs/cm
1 μs/cm
0.1 μs/cm
Accuracy
0.05pH
±1.5% FS
±1.5% FS
±1.5% FS
Temperature Range
0.0-99.0 °C
Temperature Compensation
Yes
Display
Dual
Calibration
Buffer Group
Automatic Shutdown
ATC - With Temperature Display
-
Dual
3 Point
-
-
-
4.01, 7.00, 10.01
-
-
-
6 Minutes of Non-Use
6 Minutes of Non-Use
Battery
4 AG13 1.5V
Micro Alkaline Batteries
4 AG13 1.5V
Micro Alkaline Batteries
Size / Weight
185 x 45 x 38 mm / 110g
Other Models available
22
-
ST10 - 30073970
Free Call 1800 723 405
185 x 45 x 38 mm / 110g
ST10C-C - 30073974
ST10C-B - 30073973
ST10C-A - 30073972
ORP Meters
Salinity Meters
TDS Meters
ST20R
ST20S
ST20T-B
30073985
30073983
30073981
-1000mV-1000mV
0.0-80.0 ppt
0-1000 mg/L
Resolution
1mV
0.1 ppt
1 mg/L
Accuracy
2mV
±1.5% FS
±1.5% FS
-
With Temperature Display
With Temperature Display
0.0-99.0 °C
-
-
Temperature
Compensation
Yes
-
-
Display
Dual
Dual
Dual
Calibration
NA
-
-
Automatic
Shutdown
6 Minutes of Non-Use
6 Minutes of Non-Use
6 Minutes of Non-Use
Battery
4 AG13 1.5V
Micro Alkaline Batteries
4 AG13 1.5V
Micro Alkaline Batteries
4 AG13 1.5V
Micro Alkaline Batteries
Size / Weight
185 x 45 x 38 mm, 110g
185 x 45 x 38 mm, 110g
185 x 45 x 38 mm, 110g
Model
Part Number
Range
ATC
Temperature Range
Other
Models
available
ST10R - 30073984
ST10S - 30073982
ST20T-A - 30073980
ST10T-B - 30073979
ST10T-A - 30073978
More Pen Meters also available, click here to see the full range
............................................................................
Solutions and Buffers
Part Number
•
•
•
•
Description
30100441
Conductivity Standard 10 μS/cm, 250ml per bottle
30100442
Conductivity Standard 84 μS/cm, 250ml per bottle
30100443
Conductivity Standard 1413 μS/cm, 250ml per bottle
30100444
Conductivity Standard 12.88 μS/cm, 250ml per bottle
83033971
pH Buffer Powder Sachet (4.01;7.00;10.01)
30100424
pH1.68, 250ml per bottle
30100425
pH4.01, 250ml per bottle
30100426
pH6.86, 250ml per bottle
30100427
pH7.00, 250ml per bottle
30100428
pH9.18, 250ml per bottle
30100429
pH10.01, 250ml per bottle
30100440
pH12.45, 250ml per bottle
30059255
pH electrode reference electrolyte
30059256
pH electrode protection solution
Cleaning solutions also available
Up to 2 years shelf life at the right temperature
250ml Bottle packaging
Certificates also available
www.pacificlab.com.au
23
About OHAUS Starter Series
After more than a century of perfecting the art
of measurement through our durable weighing products,
OHAUS precision is now available in a line of benchtop,
portable and pen pH, conductivity, dissolved oxygen,
salinity, total dissolved solids (TDS), oxidation
reduction potential (ORP) meters and electrodes.
The Starter Series includes a wide breadth of
products from basic level meters that offer high
performance at a great value to high performance
products that have extended and advanced functionality,
as well as a variety of electrodes that can be used in
combination with our bench and portable meters.
Distributed By
Australian Head Of f ice
PO BOX 465
Blackburn, VIC 3130
Ingeniously Practical
Free Call: 1800 723 405
Ph: (03) 9845 0300
Fax: + 61 3 9845 0350
e-mail: sales@pacif iclab.com.au
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