pH electrode selection guide by application

electrodes-270x195

It is critical that the electrochemical measurements you perform day to day are accurate and reproducible. You rely on your pH electrodes to measure your samples quickly and precisely, making them an essential part of your lab. Whether you’re testing samples in pharmaceuticals, food, or general lab work, one incorrect reading can have devastating effects.

The types of available electrodes, the desired electrode features, and the compatibility of the electrode with the sample are all determining factors in selecting the right pH electrode. However, you might be interested in selecting the best pH electrode by your respective application. Thermo Scientific offers pH electrodes that meet applications such as laboratory use, plant samples, titration, food and beverage testing, brine samples, environmental samples, and much more. Choose from the applications below to begin exploring our pH electrode offerings.


Quick links:

Electrodes for laboratory use

Your simple aqueous pH measurements are used to qualify a sample's acidity as part of general laboratory use and requirements. 

Use these pH electrodes for general purpose, simple pH samples. 

Featured electrodes for laboratory use:

All electrodes are suitable for general purpose measurements.

[G] = Glass body
[E] = Epoxy body

  Featured electrodes Also available
pH & temperature

 8302BNUMD [G]
8107BNUMD [E]

9107BNMD [E]
8107BNUMD [E]
Low maint & rugged epoxy body GD9106BNWP [E] 9106BNWP  [E]
GS9106BNWP [E]
Long life & chemical resistant 8102BN [G]
8102BNUWP [G]
9102BNWP [G]
9102DJWP [G]
Clog-resistant 8172BNWP [G]
8165BNWP [E]
GS9106BNWP [E]
9172BNWP [G]
9165BNWP [E]
Rugged bulb & chemical resistant 8104BN [G]
8104BNUWP [G]
9104BNWP [G]
9162BNWP [G]

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Field Use or Plant Samples

The atmosphere you work in calls for rugged design that ensures accuracy in harsh environments, as precision in real-time sample testing crucial. pH electrodes recommended for field use and plant samples should have an epoxy body for added durability and be polymer or gel filled for easy maintenance.

Use pH electrodes for field use and plant samples for water (lakes, ponds, streams, rivers, etc.), wastewater, food manufacturing, cosmetics, pulp and paper, petrochemicals, and more.

Featured electrodes for field use and plant samples:

Electrodes for field use or plant samples should have an epoxy body for added durability for harsh environments and be polymer or gel filled for easy maintenance.

[G] = Glass body
[E] = Epoxy body

  Featured electrodes Also available
pH & temperature 8302BNUMD [G] 9107BNMD [E]
8107BNUMD [E]
Low maint & rugged epoxy body GD9106BNWP [E]
8107BNUMD [E]
9106BNWP [E]
GS9106BNWP [E]
Long life & chemical resistant 8102BN [G]
8102BNUWP [G]
9102BNWP [G]
9102DJWP [G]
Clog-resistant 8172BNWP [G]
8165BNWP [E]
GS9106BNWP [E]
9172BNWP [G]
9165BNWP [E]
Rugged bulb & chemical resistant 8104BN [G]
8104BNUWP 
[G]
9104BNWP [G]
9162BNWP [G]

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electrodes for biological and pharmaceutical use

Sample preparation is a critical part of your testing workflow—accurate and reproducible measurements are imperative. For the early stages of research, pH electrodes recommended for biological and pharmaceutical use should have a ROSS and double junction Ag/AgCl reference (no sample contact with silver) or be TRIS compatible. 

Use pH electrodes for biological and pharmaceutical applications and sample preparation specific to DNA, RNA, TRIS buffers, media, buffer preparation, proteins, enzymes, research, and more.

Featured electrodes for biological and pharmaceutical samples:

Electrodes should have a ROSS or double junction Ag/AgCl reference (no sample contact with silver)

[G] = Glass body
[E] = Epoxy body

  Featured electrodes Also available
pH & temperature 8302BNUMD [G]  
8157BNUMD [E]
 8302BNURCA [G]
8157BNURCA [E]
8107BNUMD [E]
8107BNURCA [E]
Long life & chemical resistant 8102BNUWP [G] 9102DJWP [G]
8102BN [G]
Semi-micro size  8103BN [G]
8103BNUWP [G]
911600 [E]
9110DJWP [G]
8115BN [E]
8115BNUWP [E]
Micro size 8220BNWP [G] 9810BN [G]
9863BN [--]
Titrations 8172BNWP [G] 9172BNWP [G]
8162SC [G]

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Academic and education students in the lab

Equip your classroom or academic lab with electrodes our future lab technicians can use every day. For teaching applications, recommended pH electrodes should have an epoxy body for added durability, semester after semester. For advanced academic use, glass-body electrodes can be selected if they fit the application.

Use pH electrodes for academic and student use in general chemistry, water ecology or environmental testing, field use, and more.

Featured electrodes for academic and student use:

Electrodes should have an epoxy body for added durability in rugged classroom environments. Advancing to glass-body electrodes will permit the use of micro, semi-micro, and specialized electrodes in a more delicate setting.

[G] = Glass body
[E] = Epoxy body

  Featured electrodes Also available
pH & temperature  8107BNUMD [E]
 8157BNUMD [E]
9107BNMD [E]
9157BNMD [E]
Low maint & rugged
epoxy body
 GD9106BNWP [E] 9106BNWP [E]
GS9106BNWP [E]
Long life & chemical resistant  8102BNUWP [G] 9102BNWP [G]
9172BNWP [G]
Rugged bulb & chemical resistant  8104BN [G]
8104BNUWP [G]
9104BNWP [G]
9104APWP [G]

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Titration

Achieving repeatable and reliable sample analysis results through the automated method of titration is key. pH electrodes recommended for use with titration should have a Sure-Flow or sleeve junction for better contact with the samples to provide stable measurements.

Use these pH electrodes when measuring acidity using direct titration, alkalinity, total acidic number, total base number, and for basic R&D work.

Featured electrodes for titration measurement:

Electrodes should have Sure-Flow or sleeve junction for better contact with the sample and more stable measurements.

[G] = Glass body
[E] = Epoxy body

  Featured electrodes Also available
General titrations  8172BNWP [G] 9172BNWP [G]
8162SC (need cable) [G]
Non-aqueous titrations  8172BNWP [G] 9172BNWP [G]
8162SC (need cable) [G]

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food and beverage applications

As a brewer, winemaker, cheesemaker, or yogurt technician, accurate sample analysis and quality control are essential to your day-to-day functions, ensuring results that meet regulations and product development requirements. pH electrodes recommended for food and beverage applications should have a flat-surface tip and ROSS or double junction Ag/AgCl reference (no sample contact with silver), or a spear tip for piercing samples and a ROSS or double junction Ag/AgCl reference.

Use pH electrodes for food and beverage applications when testing beer, wine, semi-solids, meat, cheese, juice, carbonated beverages, and much more. Testing could be executed in QC/QA labs or during product development.

Featured electrodes for food and beverage:

Electrodes should have a Sure-Flow or open junction to prevent the electrode from clogging.

[G] = Glass body
[E] = Epoxy body

  Featured electrodes Also available
pH & temperature  8107BNUMD [E] 8302BNUMD [G]
8157BNUMD [E]
Sauces, jams, salad dressing, dairy  8172BNWP [G] 9165BNWP [E]
9172BNWP [G]
High temperatures—pH & temp  8302BNUMD (100°C) [G] 9107BNMD (80°C) [E]
9157BNMD (90°C) [E]

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petrochemical and non-aqueous samples

Your petrochemical and non-aqueous sample types can be challenging, resulting in unstable readings or drifts. pH electrodes recommended for petrochemical and non-aqueous applications should have a ROSS Sure-Flow or open junction to prevent clogging.

Use pH electrodes for these applications when testing paints, inks, petroleum products, engine coolant, bioethanol, and alcohol, among others.

Featured electrodes for petrochemical and non-aqueous samples:

Electrodes should have a glass body that resists damage from the sample and a Sure-Flow or open junction to prevent the electrode from clogging.

[G] = Glass body
[E] = Epoxy body

  Featured electrodes Also available
pH & temperature  8165BNWP [E] 9107BNMD [E]
9157BNMD [E]
Low maint & rugged epoxy body  9165BNWP [E] 9106BNWP [E]
GS9106BNWP [E]
Long life & chemical resistant  8172BNWP [G] 9102BNWP [G]
9172BNWP [G]
Rugged bulb & chemical resistant  9107APMD [E] 8104BN [G]
9104BNWP [G]
8162BNWP [G]

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Extreme pH and brine samples

Ionic strength is an important factor in many processes. High-ionic-strength solutions change the liquid junction potential; to ensure the best performance with extreme pH and brine sample types, the pH electrodes recommended for use are ROSS Sure-Flow or open junction electrodes.

Use the following pH electrodes when measuring samples with extreme pH or high salt content.

Featured electrodes for extreme pH and brine samples:

Electrodes should have a Sure-Flow or open junction for better contact with the sample and more stable measurements.

[G] = Glass body
[E] = Epoxy body

  Featured electrodes Also available
pH & temperature 8302BNUMD [G] 9157BNMD [E]
8157BNUMD [E]
Easy  maintenance, flushable junction 8172BNWP [G]
8165BNWP [G]
9172BNWP [G]
9165BNWP [E]
Rugged epoxy body 8165BNWP [E]
8156BNUWP 
[E]
8156BNWP [E]
GD9156BNWP [E]
HF (hydrofluoric acid) 8172BNWP [G]
8104BNWP [G]
9106BNWP [E]
9104APWP [G]
8104BN [G]

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industrial and chemical applications

Chemical validation and quality control of air and water in your industrial and chemical applications is essential to your plant’s performance. pH electrodes recommended for use in industrial and chemical applications should have a glass body that resists damage from the sample and a Sure-Flow or open junction to prevent the electrode from clogging and to help provide better contact with the sample. 

Use pH electrodes for industrial and chemical applications specific to chemical validation, quality control and assurance of production, and more.

Featured electrodes for industrial and chemical applications:

Electrodes should have a glass body that resists damage from the sample and a Sure-Flow or open junction to prevent the electrode from clogging.

[G] = Glass body
[E] = Epoxy body

  Featured electrodes Also available
pH & temperature 8302BNUMD [G] 9107BNMD [E]
9157BNMD [E]
Extreme pH (<2 or >12) & Brines 8172BNWP [G] GD9106BNWP [E]
9172BNWP [E]
Viscous—slurry, emulsion, wet sludge 8172BNWP  [G] 9104APWP [G]
9172BNWP [G]
Flat surface—paper, dewatered sludge, textiles 8135BN [E]
8135BNUWP [E]
913600 [E]
9135APWP [E]

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Consumer products application

Sample analysis in quality control and quality assurance labs needs consistent validation for products to meet regulations and product development requirements. pH electrodes recommended for consumer products applications should have a Sure-Flow or open junction to prevent the electrode from clogging.

Use pH electrodes for consumer products applications when testing cosmetics, lotions, oils, baby products, health products, and much more. 

Featured electrodes for consumer products applications:

Electrodes should have a glass body that resists damage from the sample and a Sure-Flow or open junction to prevent the electrode from clogging.

[G] = Glass body
[E] = Epoxy body

  Featured electrodes Also available
pH & temperature 8107BNUMD [E] 9104BNWP [G]
9107APMD [E]
Clog-resistant & easy to clean 8172BNWP [G]
9104APWP [G]
9172BNWP [G]
9165BNWP [E]
Clog resistant & rugged body GD9106BNWP [E] GS9106BNWP [E]
9156APWP [E]
8165BNWP [E]

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Environmental applications

Whether you’re in the field looking for environmental changes or you’re researching sprays and pesticides that affect the general population, real-time sample analysis is vital on-the-go. pH electrodes recommended for environmental applications should have a ROSS or double junction Ag/AgCl reference, an epoxy body for added durability, and be refillable for better contact with the sample.

Use pH electrodes for environmental applications including seawater, rivers, streams, lakes, runoffs, rain water, soil, and more.

Featured electrodes for environmental applications:

Electrodes should have an epoxy body for durable applications; they should also have a ROSS or double junction Ag/Ag/Cl reference and be refillable for better contact with the sample.

[G] = Glass body
[E] = Epoxy body

  Featured electrodes Also available
pH & temperature 8107BNUMD [E] 9107BNMD [E]
9157BNMD [E]
Clean waters—potable, surface, ground, drinking, treated effluent 815600 [E]
8156BNUWP [E]
9156APWP [E]
9162BNWP [G]
Wastewater 8172BNWP [G]
8165BNWP [E]
9156APWP [E]
GD9106BNWP [E]

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Clean and Pure Water

Using clean or pure water to dilute and validate samples is essential in an everyday lab setting. Recommended pH electrodes should be ROSS or double junction Ag/AgCl reference and be refillable for better contact with the sample. 

Use pH electrodes for clean and pure water applications during general laboratory measurements for diluting samples and more.

Featured electrodes for clean and pure waters—distilled, deionized, purified, boilerfeed, and rain water applications:

[G] = Glass body
[E] = Epoxy body

  Featured electrodes Also available
pH & temperature 8302BNUMD [G]
8107BNUMD [E]
9107BNMD [E]

Low maint & rugged epoxy body GD9106BNWP [E] 9106BNWP [E]
GS9106BNWP [E]
Long life & chemical resistant 8102BN [G]
8102BNUWP [G]
9102BNWP [G]
9102DJWP [G]
Clog-resistant 8172BNWP [G]
8165BNWP [E]
GS9106BNWP [E]
9172BNWP [G]
9165BNWP [E]
Rugged bulb & chemical resistant 8104BN [G]
8104BNUWP [G]
9104BNWP [G]
9162BNWP [G]

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pH electrode features

Electrode types, features and compatibility are determining factors in selecting the right pH electrode. pH electrodes are available with a glass or epoxy body and a variety of electrode body styles, fill types, references, junctions and connectors to suit your application. 

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