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Home  >  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. See our Tech Resource: Anatomy of a pH Electrode.

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 bufferDouble-junction or ROSS®
PharmaceuticalsDouble-junction or ROSS
Hydrofluoric acidAntimony or HF electrode
Low ionic strength samples and acid rainAccuFlow™ or Sure-Flow® styles
Boiler feed water and distilled waterAccuFlow or Sure-Flow styles
Drinking waterStandard Ag/AgCl with single-junction
WastewaterDouble-junction or ROSS
Solutions with heavy metalsDouble-junction
Soil samplesSoil electrode or double-junction
pH>9 and high Na+Amber glass bulb, Ag/AgCl
High or rapidly changing temperaturesROSS styles
Moist, flat surfacesFlat-surface
Cheese, agar, paper, and skinFlat-surface
Semisolid samplesSpear-tip, Ag/AgCl, ISFET
Fruits, cheese, and meatSpear-tip, Ag/AgCl, ISFET
Nonaqueous samples, solvents, and alcoholsAccuFlow styles, Sure-Flow styles, or double-junction
Viscous samples, slurries, suspended solids, and sludgesAccuFlow styles, Sure-Flow styles, double junction, or ISFET
Emulsions and oilsAccuFlow styles, Sure-Flow styles, double-junction, or ISFET
Paints and inksAccuFlow styles, Sure-Flow styles, double-junction, or ISFET

 Product Detail
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Cole-Parmer pH electrode, combination, double-junction, gel filled

  • Product Type: pH Electrode
  • Body type: Epoxy
  • Junction type: Double
EW-59001-70
In stock.
$89.50 USD/EACH

Qty:

Cole-Parmer pH electrode, single-junction, gel, BNC connector

  • Product Type: pH Electrode
  • Body type: Epoxy
  • Junction type: Single
EW-59001-65
In stock.
$77.00 USD/EACH

Qty:

Oakton General-Purpose pH Probe, Refillable/DJ/Glass/3 ft Cable; BNC

  • Product Type: pH Electrode
  • Body type: Glass
  • Reference junction: Double-junction
EW-35805-04
In stock.
$132.00 USD/EACH

Qty:

Oakton single-junction, epoxy-body, gel-filled waterproof pH electrode with ATC

  • Product Type: pH Electrode
  • Body type: Epoxy
  • Junction type: Single
EW-35808-71
In stock.
$103.00 USD/EACH

Qty:

Oakton double-junction, epoxy-body, gel-filled waterproof pH electrode with ATC

  • Product Type: pH Electrode
  • Body type: Epoxy
  • Junction type: Double
EW-35808-72
In stock.
$131.00 USD/EACH

Qty:

Oakton General-Purpose pH Probe, Sealed/DJ/Epoxy/3 ft Cable; BNC

  • Product Type: pH Electrode
  • Body type: Epoxy
  • Reference junction: Double-junction
EW-35805-01
In stock.
$77.50 USD/EACH

Qty:

Cole-Parmer All-in-One pH/ATC Probe, Refillable/DJ/Glass; for Oakton Series

  • Product Type: pH Electrode
  • pH range: 0 to 14
  • Cable length: 1-meter
EW-05991-36
In stock.
$211.00 USD/EACH

Qty:

Thermo Scientific Orion pH/ATC Probe, Sealed/SJ/Epoxy/5 ft; BNC/8-Pin DIN

  • Product Type: Sealed, gel-filled
  • Body type: Epoxy
  • Reference junction: Single-junction
EW-58823-30
In stock.
$264.00 USD/EACH

Qty:

Oakton pH Probe, Sealed/DJ/Epoxy/High pH Sodium/3 ft Cable; BNC

  • Product Type: pH Electrode
  • Body type: Epoxy
  • Reference junction: Double-junction
EW-35805-06
In stock.
$77.50 USD/EACH

Qty:

Accumet-Compatible Replacement pH/ATC Probe

  • Product Type: pH Electrode
  • Body type: Epoxy
  • Junction type: Ag/AgCl
EW-59500-81
In stock.
$180.00 USD/EACH

Qty:

Oakton All-in-One pH/ATC Probe,Refillable/DJ/Glass; BNC/Mini-Phono

  • Product Type: pH Electrode
  • Body type: Glass
  • Reference junction: Double-junction
EW-35811-74
In stock.
$211.00 USD/EACH

Qty:

Cole-Parmer Combination Ion Selective Electrodes, Fluoride (F)

  • Product Type: pH Electrode
  • Brand: Cole-Parmer
  • Qty/ea: 1
EW-27504-14
In stock.
$286.00 USD/EACH

Qty:

Thermo Scientific ROSS Ultra pH/ATC Probe, DJ/Glass; BNC/MiniDIN

  • Product Type: pH Electrode
  • Body type: Glass
  • Reference junction: Double-junction
EW-05718-28
In stock.
$566.00 USD/EACH

Qty:

Oakton General-Purpose pH Probe, Sealed/SJ/Epoxy/Direct Connect; BNC

  • Product Type: pH Electrode
  • Body type: Epoxy
  • Reference junction: Single-junction
EW-35804-00
In stock.
$53.00 USD/EACH

Qty:

Oakton single-junction, epoxy-body, gel-filled pH electrode with ATC

  • Product Type: pH Electrode
  • Body type: Epoxy
  • Junction type: Single
EW-35801-71
In stock.
$87.00 USD/EACH

Qty:

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