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pH/Ion Laboratory Electrodes (234)
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Home  >  pH Meters and Water Quality Products > Electrodes, Laboratory

Electrodes, Laboratory

Electrodes, Laboratory

pH Electrode Basics
The Electrode Pair
Sensing half-cell electrodes are the measuring portion of the electrode system and contain the pH sensitive membrane. Reference half-cells electrodes provide the reference potential needed for pH
measurement. Most of the electrodes available at Cole-Parmer are combination electrodes that house both half-cells in a single probe.

Bulb Material And Design
The bulb or membrane is constructed of different types of glass, each with different
useful properties.

General-purpose glass: various pH ranges, temperatures to 212ºF (100ºC).

Blue glass: pH 0 to 14, temperatures to 230ºF (110ºC).

Amber glass: pH 0 to 14, temperatures to 230ºF (110ºC), prevents Na+ error in high Na+ concentration solutions.

The bulb shape can be modified to provide a semi-dome for increased ruggedness, a spear tip for penetration applications, or even a flat surface.

Glass vs Epoxy Body
Epoxy-body electrodes are impact resistant and are ideal for rough handling but should not be used at higher temperatures or for solvents.
Note: Even though the body of an epoxy electrode is plastic, the bulb will still be glass. Glass-body electrodes withstand high temperatures and highly corrosive materials or solvents.

Sealed vs Refillable
Sealed (also known as gel-filled) electrodes are easier to maintain than refillable liquid filled electrodes. However, they must be replaced when the fill material level is low. Refillable electrodes are long-lasting and provide a faster response.

Single- vs Double-junction
In combination electrodes, the reference junction allows H+ ions to pass freely between reference and sensing half-cells to complete the electrical circuit. A singlejunction design has one place where the H+ ions pass between half-cells. The junction is located so that contaminants in your sample can also pass into the reference chamber, leaving the potential for electrode failure due to reference contamination. A double-junction design restricts the reference behind a second junction; thus, it is twice as hard for reference contamination to occur.

Selecting The Right Electrode
Cole-Parmer offers a variety of laboratory electrodes for your general-purpose and specialty laboratory applications. The “Application Guide” below provides information to help you find the electrode that best fits your application. The guide only offers suggestions—call our Application Specialists for more specific
recommendations or clarification.

Application Guide
Biological samples, proteins, and tris buffer: Double-junction or ROSS®
Pharmaceuticals: Double-junction or ROSS
Hydrofluoric acid: Antimony or HF electrode
Low ionic strength samples and acid rain: AccuFlow™ or Sure-Flow® styles
Boiler feed water and distilled water: AccuFlow or Sure-Flow styles
Drinking water: Standard Ag/AgCl with single-junction
Wastewater: Double-junction or ROSS
Solutions with heavy metals: Double-junction
Soil samples: Soil electrode or double-junction
pH>9 and high Na+: Amber glass bulb, Ag/AgCl
High or rapidly changing temperatures: ROSS styles
Moist, flat surfaces: Flat-surface
Cheese, agar, paper, and skin: Flat-surface
Semisolid samples: Spear-tip, Ag/AgCl, ISFET
Fruits, cheese, and meat: Spear-tip, Ag/AgCl, ISFET
Nonaqueous samples, solvents, and alcohols: AccuFlow styles, Sure-Flow styles, or double-junction
Viscous samples, slurries, suspended solids, and sludges: AccuFlow styles, Sure-Flow styles, double junction, or ISFET
Emulsions and oils: AccuFlow styles, Sure-Flow styles, double-junction, or ISFET
Paints and inks: AccuFlow styles, Sure-Flow styles, double-junction, or ISFET
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EW-05990-45 pH electrode, general purpose, combination, extra-long neck, sealed, epoxy body, BNC

pH electrode, general purpose, combination, extra-long neck, sealed, epoxy body, BNC

Product Type pH Electrode,Body type Epoxy
EW-05990-45
In stock.
$150.00 USD/EACH

Qty:
EW-05993-28 PH ELECTRODE, COMBINATION, PTFE REFERENCE-JUNCTION, GEL-FILLED, SEALED, EPOXY BODY, COILED CABLE, BNC

pH Electrode, Combination, PTFE Reference-junction, Gel-filled, Sealed, Epoxy Body, Coiled Cable, BNC

Product Type pH Electrode,Body type Epoxy
EW-05993-28
In stock.
$110.00 USD/EACH

Qty:
EW-58819-91 Thermo Scientific Orion pH/ATC Triode, epoxy body, sealed, single-junction, built-in ATC with 8 pin DIN connection, 3.3-ft (1-m) cable, BNC connector

Thermo Scientific Orion pH/ATC Triode, epoxy body, sealed, single-junction, built-in ATC with 8 pin DIN connection, 3.3-ft (1-m) cable, BNC connector

Product Type Sealed, gel-filled,Body type Epoxy,Built-in ATC Yes
EW-58819-91
In stock.
$233.00 USD/EACH

Qty:
EW-05993-25 PH ELECTRODE, COMBINATION, PTFE REFERENCE-JUNCTION, GEL-FILLED, SEALED, EPOXY BODY, BNC

pH Electrode, Combination, PTFE Reference-junction, Gel-filled, Sealed, Epoxy Body, BNC

Product Type pH Electrode,Body type Epoxy
EW-05993-25
In stock.
$94.00 USD/EACH

Qty:
EW-05998-30 pH electrode, combination, double-junction, KNO3 gel, glass body, BNC

pH electrode, combination, double-junction, KNO3 gel, glass body, BNC

Product Type pH Electrode,Body type Glass
EW-05998-30
In stock.
$112.00 USD/EACH

Qty:
Representative photo only Thermo Scientific Orion ROSS pH electrode glass body refillable double junction general purpose 3 3 ft 1 m cable BNC connector

Thermo Scientific Orion ROSS pH electrode, glass body, refillable, double-junction, general purpose, 3.3-ft (1-m) cable, BNC connector

Product Type pH Electrode,Body type Glass,Built-in ATC No
EW-05718-02
In stock.
$400.00 USD/EACH

Qty:
Representative photo only Cole Parmer Combination Ion Selective Electrodes Nitrate

Cole-Parmer Combination Ion Selective Electrodes, Nitrate

Product Type pH Electrode,Body type Epoxy,Built-in ATC No
EW-27504-22
In stock.
$272.00 USD/EACH

Qty:
EW-05991-61 pH electrode, general purpose, combination, long-slender-neck, refillable, glass body, BNC

pH electrode, general purpose, combination, long-slender-neck, refillable, glass body, BNC

Product Type pH Electrode,Body type Glass
EW-05991-61
In stock.
$142.00 USD/EACH

Qty:
EW-35805-15 Oakton ORP electrode, epoxy body, sealed, double-junction, general purpose, 3-ft (0.9-m) cable, BNC connector

Oakton ORP electrode, epoxy body, sealed, double-junction, general purpose, 3-ft (0.9-m) cable, BNC connector

Product Type ORP Electrode,Body type Epoxy,Built-in ATC No
EW-35805-15
In stock.
$127.00 USD/EACH

Qty:
Representative photo only Thermo Scientific Orion ROSS Ultra pH ATC Triode glass body refillable double junction built in ATC with MiniDIN connection 3 3 ft 1 m cable BNC connector

Thermo Scientific Orion ROSS Ultra pH/ATC Triode, glass body, refillable, double-junction, built-in ATC with MiniDIN connection, 3.3-ft (1-m) cable, BNC connector

Product Type pH Electrode,Body type Glass,Built-in ATC Yes
EW-05718-28
In stock.
$528.00 USD/EACH

Qty:
EW-05722-16 Thermo Scientific Orion ISE ammonia/ammonium electrode with BNC connector

Thermo Scientific Orion ISE ammonia/ammonium electrode with BNC connector

Product Type pH Electrode,Model 9512BNWP,Brand Thermo Scientific Orion
EW-05722-16
In stock.
$653.00 USD/EACH

Qty:
EW-05718-70 Thermo Scientific Orion ROSS Ultra pH electrode, glass body, refillable, double-junction, general purpose, 3.3-ft (1-m) cable, waterproof BNC connector

Thermo Scientific Orion ROSS Ultra pH electrode, glass body, refillable, double-junction, general purpose, 3.3-ft (1-m) cable, waterproof BNC connector

Product Type pH Electrode,Body type Glass,Built-in ATC No
EW-05718-70
Usually ships in 8 days or sooner.
$453.00 USD/EACH

Qty:
Representative photo only Oakton pH electrode glass body sealed double junction spear tip 3 ft 0 9 m cable BNC connector

Oakton pH electrode, glass body, sealed, double-junction, spear tip, 3-ft (0.9-m) cable, BNC connector

Product Type pH Electrode,Body type Glass,Built-in ATC No
EW-35805-18
In stock.
$132.00 USD/EACH

Qty:
EW-35811-74 Image is for illustrative purposes only. Please refer to product description

Oakton "All-in-One" pH/ATC electrode, glass body, refillable, double-junction, high sodium/high pH applications, built-in ATC with mini-phono connector, 2.5-ft (0.8-m) cable, BNC connector

Product Type pH Electrode,Body type Glass,Built-in ATC Yes
EW-35811-74
In stock.
$202.00 USD/EACH

Qty:
EW-05718-51 Thermo Scientific Orion ROSS Sure-Flow pH electrode, glass body, refillable, double-junction, flushable junction, 3.3-ft (1-m) cable, waterproof BNC connector

Thermo Scientific Orion ROSS Sure-Flow pH electrode, glass body, refillable, double-junction, flushable junction, 3.3-ft (1-m) cable, waterproof BNC connector

Product Type pH Electrode,Body type Glass,Built-in ATC No
EW-05718-51
In stock.
$480.00 USD/EACH

Qty:
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