pH measurement handbook download

Select features that meet the needs of your applications

The Thermo Scientific electrodes portfolio spans a vast range of industries and applications, and are categorized into digestible classifications to help you choose which electrode is best for your application.

Navigate below to choose your electrode by technology, and to find the solutions and accessories for your electrodes.


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Electrode Technologies

pH electrodes by category

ROSS
ROSS electrode
  • Fast response, accuracy and reproducibility regardless of sample composition; exhibits unmatched response to temperature variations
  • Double junction reference for complex samples such as biological media, foods, pharmaceuticals, TRIS, sulfides, and proteins
  • Available in all body styles
  • ROSS Ultra electrodes have an industry best warranty

 

Triode
Orion Triode electrode
  • Combination pH electrode with built-in temperature sensor
  • Convenient ability to measure pH and temperature with one electrode
  • BNC connector for pH measurement and alternative connector for temperature measurement
  • Compatible with Thermo Scientific Orion pH meters and other brands

    The temperature connector and temperature element can be unique to meter model.
Sure-Flow
Orion SureFlow electrode
  • Unique, free-flowing liquid-to-liquid junction
  • Easy-to-clean junction avoids clogging
  • Dirty or viscous samples can be easily measured without a clogged junction
  • Compatible with samples containing organic compounds, proteins, heavy metals, and other compounds that react with silver such as bromides, iodides, cyanides, and sulfides
  • Silver chloride sure-flow electrodes can be used on tough samples that do not require a double junction electrode to prevent contact with silver

pH electrode types

Standard size
standard tip pH electrodes
  • 12 mm electrode diameter for use in a wide variety of sample sizes
  • Accurate, chemically compatible, and fast response are all characteristics of the standard-sized glass bulbs
  • A variety of junctions available from Sure-flow to low-maintenance junctions
Semi-micro
ssemi-micro tip style pH electrodes
  • 6 to 8 mm electrode diameter for sample sizes down to 200 μL
  • Glass body semi-micro electrodes provide superior chemical resistance and can withstand high temperatures while allowing samples down to 200 μL
  • Variety of options to choose from, including epoxy body and glass micro-tip

pH micro and semi-micro electrodes ›

Micro
micro tip style pH electrodes
  • 1 to 5 mm electrode diameter for samples as small as 0.5 μL and containers as small as 384 well plates
  • Microelectrodes are designed to measure small volumes down to 0.5 μL 
  • These delicate electrodes permit insertion into small devices, such as 384 microwell plates
  • A variety of styles available, such as ROSS and septa-piercing tips

pH micro and semi-micro electrodes ›

Rugged bulb
rugged bulb style electrodes
  • When glass is required, the extra durable pH bulb prevents breakage
  • When durability and glass are needed, this bulb design provides all the chemical compatibility of glass electrodes with the added benefit of improved ruggedness
Spear tip
flat spear tip style pH electrodes
  • For piercing solid or semi-solid samples and measuring small-volume samples
  • Spear tip pH electrodes can be used for piercing soft samples like cheese or fruit, or cutting through tougher samples such as meat 
  • For the toughest piercing samples, look for the KnipHe electrode.

pH spear tip style electrodes ›

Flat surface tip
flat spear tip style pH electrodes
  • For measuring a solid surface or gel sample
  • Flat surface electrodes are epoxy body electrodes with a flat pH bulb that allows you to measure moist solid samples or small volumes
  • They can be used on samples such as meats, cheese, or in agar gel plates; available in single- or double-junction designs; either refillable or low-maintenance

pH flat surface tip style electrodes ›

pH electrode junctions

Sure-flow, sleeve, and laser-drilled hole (open)
  • Best junction for dirty, difficult samples
  • Junction is clog-free and easy to clean
  • Ideal for thick or viscous samples, compatible with all sample types
Ceramic and glass capillary
  • Better junction for routine lab or field use
  • Junction is high quality and durable
  • Ideal for most applications and samples
Wick and glass fiber
  • Good junction for routine lab or field use
  • Junction used with rugged epoxy electrodes
  • Ideal for aqueous samples

pH electrode references

ROSS reference
  • 0.01 pH precision
  • Best measurement response time
  • Ideal for virtually any sample type including TRIS, protein, and sulfide samples
  • Variety of body styles and types
  • Refillable or gel design
  • Best temperature response
Double junction Ag/AgCl reference
  • 0.02 pH precision
  • Better measurement response time
  • Ideal for TRIS, protein, and sulfide samples
  • Variety of body styles and types
  • Refillable, polymer or gel design
  • Good temperature response
Single junction Ag/AgCl reference
  • 0.02 to 0.1 pH precision
  • Good measurement response time
  • General purpose for everyday use
  • Variety of body styles and types
  • Refillable or gel design
  • Good temperature response

pH electrode fill types

Refillable
  • Easy maintenance, filling solution required
  • Periodic filling and draining needed
  • Long expected life span
  • 0.01 to 0.02 pH precision
  • Best response time
  • 1 to 2 year warranty (6 months for Ag/AgCl micro electrodes)

pH Refillable Glass Electrodes ›
pH Refillable Epoxy Electrodes ›

Polymer filled (sealed)
  • Low maintenance, no filling solution needed
  • Sealed reference
  • Easy to use, ideal for most applications
  • 0.02 pH precision
  • Better response time
  • 1 year warranty
Gel filled (sealed)
  • Low maintenance, no filling solution needed
  • Sealed reference
  • Easy to use, general purpose
  • +/- 0.02 to 0.1 pH
  • Good response time
  • 3 to 6 month warranty

pH electrode body styles

Glass body
  • Compatible with virtually any sample, including solvents
  • Easy to clean
Epoxy body
  • Extremely durable and rugged to prevent breakage
  • Protective bulb guards
  • Choice of performance

pH electrode connectors

Waterproof BNC

Compatible with any pH meter that has a BNC input; ensures a waterproof and secure connection with the Thermo Scientific Orion Star A series meters

BNC

Compatible with any pH meter that has a BNC input

Screw cap
  • Electrode can be connected to a variety of meter inputs using a separate cable
  • Multiple adapters available as needed
Pin tip

Compatible with meters that have a reference half-cell input

ATC probe connectors

MiniDIN

Compatible with Thermo Scientific pH meters that have an 8-pin MiniDIN ATC input

8-pin DIN

Compatible with the Thermo Scientific Orion Star A meters and pH meters that have an 8-pin DIN ATC input

RCA

Compatible with Mettler Toledo™ pH meters that have an RCA input

ATC probe ordering information

Cat. No.Description
927005MDEpoxy ATC probe, MiniDIN
927006MDGlass ATC probe, MiniDIN
927007MDStainless steel ATC probe, MiniDIN
928007MDMicro ATC probe with stainless steel 1 mm x 38 mm tip, MiniDIN
917005Epoxy ATC probe, 8 Pin DIN
917007Stainless steel ATC probe, 8-pin DIN
927005Epoxy ATC probe, 3.5 mm phono tip

pH electrodes by category

ROSS
ROSS electrode
  • Fast response, accuracy and reproducibility regardless of sample composition; exhibits unmatched response to temperature variations
  • Double junction reference for complex samples such as biological media, foods, pharmaceuticals, TRIS, sulfides, and proteins
  • Available in all body styles
  • ROSS Ultra electrodes have an industry best warranty

 

Triode
Orion Triode electrode
  • Combination pH electrode with built-in temperature sensor
  • Convenient ability to measure pH and temperature with one electrode
  • BNC connector for pH measurement and alternative connector for temperature measurement
  • Compatible with Thermo Scientific Orion pH meters and other brands

    The temperature connector and temperature element can be unique to meter model.
Sure-Flow
Orion SureFlow electrode
  • Unique, free-flowing liquid-to-liquid junction
  • Easy-to-clean junction avoids clogging
  • Dirty or viscous samples can be easily measured without a clogged junction
  • Compatible with samples containing organic compounds, proteins, heavy metals, and other compounds that react with silver such as bromides, iodides, cyanides, and sulfides
  • Silver chloride sure-flow electrodes can be used on tough samples that do not require a double junction electrode to prevent contact with silver

pH electrode types

Standard size
standard tip pH electrodes
  • 12 mm electrode diameter for use in a wide variety of sample sizes
  • Accurate, chemically compatible, and fast response are all characteristics of the standard-sized glass bulbs
  • A variety of junctions available from Sure-flow to low-maintenance junctions
Semi-micro
ssemi-micro tip style pH electrodes
  • 6 to 8 mm electrode diameter for sample sizes down to 200 μL
  • Glass body semi-micro electrodes provide superior chemical resistance and can withstand high temperatures while allowing samples down to 200 μL
  • Variety of options to choose from, including epoxy body and glass micro-tip

pH micro and semi-micro electrodes ›

Micro
micro tip style pH electrodes
  • 1 to 5 mm electrode diameter for samples as small as 0.5 μL and containers as small as 384 well plates
  • Microelectrodes are designed to measure small volumes down to 0.5 μL 
  • These delicate electrodes permit insertion into small devices, such as 384 microwell plates
  • A variety of styles available, such as ROSS and septa-piercing tips

pH micro and semi-micro electrodes ›

Rugged bulb
rugged bulb style electrodes
  • When glass is required, the extra durable pH bulb prevents breakage
  • When durability and glass are needed, this bulb design provides all the chemical compatibility of glass electrodes with the added benefit of improved ruggedness
Spear tip
flat spear tip style pH electrodes
  • For piercing solid or semi-solid samples and measuring small-volume samples
  • Spear tip pH electrodes can be used for piercing soft samples like cheese or fruit, or cutting through tougher samples such as meat 
  • For the toughest piercing samples, look for the KnipHe electrode.

pH spear tip style electrodes ›

Flat surface tip
flat spear tip style pH electrodes
  • For measuring a solid surface or gel sample
  • Flat surface electrodes are epoxy body electrodes with a flat pH bulb that allows you to measure moist solid samples or small volumes
  • They can be used on samples such as meats, cheese, or in agar gel plates; available in single- or double-junction designs; either refillable or low-maintenance

pH flat surface tip style electrodes ›

pH electrode junctions

Sure-flow, sleeve, and laser-drilled hole (open)
  • Best junction for dirty, difficult samples
  • Junction is clog-free and easy to clean
  • Ideal for thick or viscous samples, compatible with all sample types
Ceramic and glass capillary
  • Better junction for routine lab or field use
  • Junction is high quality and durable
  • Ideal for most applications and samples
Wick and glass fiber
  • Good junction for routine lab or field use
  • Junction used with rugged epoxy electrodes
  • Ideal for aqueous samples

pH electrode references

ROSS reference
  • 0.01 pH precision
  • Best measurement response time
  • Ideal for virtually any sample type including TRIS, protein, and sulfide samples
  • Variety of body styles and types
  • Refillable or gel design
  • Best temperature response
Double junction Ag/AgCl reference
  • 0.02 pH precision
  • Better measurement response time
  • Ideal for TRIS, protein, and sulfide samples
  • Variety of body styles and types
  • Refillable, polymer or gel design
  • Good temperature response
Single junction Ag/AgCl reference
  • 0.02 to 0.1 pH precision
  • Good measurement response time
  • General purpose for everyday use
  • Variety of body styles and types
  • Refillable or gel design
  • Good temperature response

pH electrode fill types

Refillable
  • Easy maintenance, filling solution required
  • Periodic filling and draining needed
  • Long expected life span
  • 0.01 to 0.02 pH precision
  • Best response time
  • 1 to 2 year warranty (6 months for Ag/AgCl micro electrodes)

pH Refillable Glass Electrodes ›
pH Refillable Epoxy Electrodes ›

Polymer filled (sealed)
  • Low maintenance, no filling solution needed
  • Sealed reference
  • Easy to use, ideal for most applications
  • 0.02 pH precision
  • Better response time
  • 1 year warranty
Gel filled (sealed)
  • Low maintenance, no filling solution needed
  • Sealed reference
  • Easy to use, general purpose
  • +/- 0.02 to 0.1 pH
  • Good response time
  • 3 to 6 month warranty

pH electrode body styles

Glass body
  • Compatible with virtually any sample, including solvents
  • Easy to clean
Epoxy body
  • Extremely durable and rugged to prevent breakage
  • Protective bulb guards
  • Choice of performance

pH electrode connectors

Waterproof BNC

Compatible with any pH meter that has a BNC input; ensures a waterproof and secure connection with the Thermo Scientific Orion Star A series meters

BNC

Compatible with any pH meter that has a BNC input

Screw cap
  • Electrode can be connected to a variety of meter inputs using a separate cable
  • Multiple adapters available as needed
Pin tip

Compatible with meters that have a reference half-cell input

ATC probe connectors

MiniDIN

Compatible with Thermo Scientific pH meters that have an 8-pin MiniDIN ATC input

8-pin DIN

Compatible with the Thermo Scientific Orion Star A meters and pH meters that have an 8-pin DIN ATC input

RCA

Compatible with Mettler Toledo™ pH meters that have an RCA input

ATC probe ordering information

Cat. No.Description
927005MDEpoxy ATC probe, MiniDIN
927006MDGlass ATC probe, MiniDIN
927007MDStainless steel ATC probe, MiniDIN
928007MDMicro ATC probe with stainless steel 1 mm x 38 mm tip, MiniDIN
917005Epoxy ATC probe, 8 Pin DIN
917007Stainless steel ATC probe, 8-pin DIN
927005Epoxy ATC probe, 3.5 mm phono tip

 Performance
for quality control and research
Performance precision pH with durabilityPiercing semi-solid samplesPerformance reference half-cell
 Ultra combination glass body extended life pH electrode 8102BNUWPROSS Ultra combination epoxy body pH electrode 8156BNUWPROSS combination glass body pH electrode with spear tip 8163BNWPROSS Ultra glass body reference half-cell electrode 800500U
 ROSS Ultra combination glass body extended life pH electrodeROSS Ultra combination epoxy body pH electrodeROSS combination glass body pH electrode with spear tipROSS Ultra glass body reference half-cell
 
  • For precise pH determinations
  • General purpose, high performance
  • Top accuracy and rapid response to temperature extremes
  • General purpose, high performance
  • Extended life
  • For cheese, meat, and fruit samples
  • Measure samples as small as 100μL
  • Double junction for TRIS samples
  • Use with 8101BNWP or 8101SC ROSS pH half-cell or 8411BN ROSS sodium half-cell electrodes
Product SKU number8102BNUWP8156BNUWP8163BNWP
800500U
pH Range0-140-140-140-14
pH Precision0.010.010.01---
Temp. Range0-100°C0-100°C0-100°C0-100°C
Internal ReferenceROSSROSSROSSROSS
JunctionCeramicGlass FiberCeramicCeramic
Fill Solution (Cat. No.)3 M KCl (810007)3 M KCl (810007)3 M KCl (810007)3 M KCl (810007)
Dimension D (Dia) L (Length) T (Tip)

L - 120 mm
D - 12 mm

L - 120 mm
D - 12 mm

L - 120 mm
D - T - 4.5 mm x 20 mm

L - 120 mm
D - 12 mm

Connector TypeBNC Waterproof

BNC Waterproof

BNC Waterproof
Screw Cap
Pin Tip
 Top performance
with glass body
Low maintenance
with extended life
Refillable, convenient, and durableMaintains calibration for
1 year
 
 ROSS Ultra pH/ATC Triode with glass bodyROSS Ultra pH/ATC Triode with epoxy body, low maintenance gelROSS Ultra pH/ATC Triode with epoxy bodyOrion No-Cal pH/ATC Triode with epoxy body
 
  • ROSS Ultra pH/ATC Triode with epoxy body
  • Chemical resistant glass body
  • Low maintenance gel
  • Rugged epoxy body
  • General purpose, high performance
  • Rugged epoxy body
  • Designed for stability
  • Accurate to 0.1 pH w/o calibration
Product SKU number8302BNUMD(star)8107BNUMD (star)*
8107UWMMD (star)
8157BNUMD(star)*

5107BNMD

pH range0–140–140–140–14
pH precision0.010.010.020.01
Temp. range0–100°C0–100°C0–100°C0–100°C
Internal referenceROSSROSSROSSPlatinum
JunctionCeramicGlass capillaryGlass fiberCeramic
Fill solution (SKU no.)3 M KCl (810007)--3 M KCl (810007)--
Dimension D (Dia)
L (Length)
T (Tip)

L—120 mm
D—12 mm

L—120 mm
D—12 mm

L—120 mm
D—12 mm

L—120 mm
D—12 mm
Connector typeBNC waterproof—mini-DIN (star)

BNC waterproof—mini-DIN (star)*

BNC waterproof—mini-DIN (star)* 3 m

BNC waterproof—mini-DIN (star)*

BNC waterproof—mini-DIN (star)* 3 m
BMC waterproof—mini-DIN
We have an of extensive inventory of Triode Electrodes also available ›
 High performance in all samplesFast response –
even in difficult
samples
For all samples including solventsFast response in difficult samples & soils
 ROSS Sure-Flow combo pH glass body electrodesROSS Sure-Flow combo pH epoxy body electrodesSure-Flow combo pH glass body electrodesSure-Flow combo pH epoxy electrodes
 ROSS Sure-Flow combination pH electrode with glass bodyROSS Sure-Flow combination pH electrode with epoxy bodySure-Flow combination pH electrode with glass bodySure-Flow combination pH electrode with epoxy body
 
  • Sure-Flow junction prevents clogging
  • For soil, sludge, colloids, viscous material and organic solvents
  • Ideal for soil samples
  • Durable epoxy design
  • For TRIS, sulfides and proteins
  • For soil, sludge, colloids, and viscous material
  • Chemical resistant glass body
  • Rugged, durable epoxy design
  • Has removable bulb guard
Product SKU number8172BNWP8165BNWP
9172BNWP9165BNWP
pH Range0-140-140-140-14
pH Precision0.010.010.020.02
Temp. Range0-100°C0-100°C0-100°C0-100°C
Internal ReferenceROSSROSSAg/AgClAg/AgCl
JunctionSure-FlowSure-FlowSure-FlowSure-Flow
Fill Solution (Cat. No.)3 M KCl (810007)3 M KCl (810007)4 M KCl w/ Ag/AgCl (900011)4 M KCl w/ Ag/AgCl (900011)
Dimension D (Dia) L (Length) T (Tip)

L - 120 mm
D - 12 mm

L - 120 mm
D - 12 mm

L - 120 mm
D - 12 mm

L - 120 mm
D - 12 mm

Connector TypeBNC Waterproof

BNC Waterproof
EDIN Waterproof

BNC WaterproofBNC Waterproof
  Increase your productivity by adding accessories to your benchtop or portable meter. Meter Accessories ›

 Sustainably created Silver/Silver Chloride Electrode for daily useGeneral Purpose Combination Silver/Silver Chloride Electrode Economy Silver/Silver Chloride Electrode for routine measurements
    
 Orion Green pH Combination ElectrodeOrion Combination pH ElectrodeOrion Economy pH Combination Electrode
 
  • For routine pH measurements
  • Mercury and lead free
  • Available in flat surface, flask, general purpose, or semi-micro tip
  • For general purpose pH measurements
  • Glass body for higher temp solutions, to up to 90°C
  • For routine pH measurements
  • Unbreakable epoxy body for rugged conditions
  • Available in flat surface, flask, general purpose, or semi-micro tip
Product SKU numberGD9106BNWP9102BNWP 913600
pH Range0-140-140-12
Temp. Range0°C to 80°C0°C to 90°C0°C to 80°C
JunctionWickCeramicWick
FillingOrion Ag/AgCl double-junction filling solutionOrion Ag/AgCl electrode filling solutionPermanently gelled Ag/AgCl electrolyte
MaterialEpoxy body, Ag/AgCl referenceGlass body, Ag/AgCl referenceEpoxy body, Ag/AgCl electrolyte
RefillableYesYesNo
Dimension D (Dia) L (Length) T (Tip)

L – 11 cm
D – 12 mm

L – 12 cm
D – 12 mm
L – 11 cm
D – 12 mm
Connector TypeWaterproof BNC

Waterproof BNC

Waterproof BNC
 ShopShopShop

 Performance
for quality control and research
Performance precision pH with durabilityPiercing semi-solid samplesPerformance reference half-cell
 Ultra combination glass body extended life pH electrode 8102BNUWPROSS Ultra combination epoxy body pH electrode 8156BNUWPROSS combination glass body pH electrode with spear tip 8163BNWPROSS Ultra glass body reference half-cell electrode 800500U
 ROSS Ultra combination glass body extended life pH electrodeROSS Ultra combination epoxy body pH electrodeROSS combination glass body pH electrode with spear tipROSS Ultra glass body reference half-cell
 
  • For precise pH determinations
  • General purpose, high performance
  • Top accuracy and rapid response to temperature extremes
  • General purpose, high performance
  • Extended life
  • For cheese, meat, and fruit samples
  • Measure samples as small as 100μL
  • Double junction for TRIS samples
  • Use with 8101BNWP or 8101SC ROSS pH half-cell or 8411BN ROSS sodium half-cell electrodes
Product SKU number8102BNUWP8156BNUWP8163BNWP
800500U
pH Range0-140-140-140-14
pH Precision0.010.010.01---
Temp. Range0-100°C0-100°C0-100°C0-100°C
Internal ReferenceROSSROSSROSSROSS
JunctionCeramicGlass FiberCeramicCeramic
Fill Solution (Cat. No.)3 M KCl (810007)3 M KCl (810007)3 M KCl (810007)3 M KCl (810007)
Dimension D (Dia) L (Length) T (Tip)

L - 120 mm
D - 12 mm

L - 120 mm
D - 12 mm

L - 120 mm
D - T - 4.5 mm x 20 mm

L - 120 mm
D - 12 mm

Connector TypeBNC Waterproof

BNC Waterproof

BNC Waterproof
Screw Cap
Pin Tip
 Top performance
with glass body
Low maintenance
with extended life
Refillable, convenient, and durableMaintains calibration for
1 year
 
 ROSS Ultra pH/ATC Triode with glass bodyROSS Ultra pH/ATC Triode with epoxy body, low maintenance gelROSS Ultra pH/ATC Triode with epoxy bodyOrion No-Cal pH/ATC Triode with epoxy body
 
  • ROSS Ultra pH/ATC Triode with epoxy body
  • Chemical resistant glass body
  • Low maintenance gel
  • Rugged epoxy body
  • General purpose, high performance
  • Rugged epoxy body
  • Designed for stability
  • Accurate to 0.1 pH w/o calibration
Product SKU number8302BNUMD(star)8107BNUMD (star)*
8107UWMMD (star)
8157BNUMD(star)*

5107BNMD

pH range0–140–140–140–14
pH precision0.010.010.020.01
Temp. range0–100°C0–100°C0–100°C0–100°C
Internal referenceROSSROSSROSSPlatinum
JunctionCeramicGlass capillaryGlass fiberCeramic
Fill solution (SKU no.)3 M KCl (810007)--3 M KCl (810007)--
Dimension D (Dia)
L (Length)
T (Tip)

L—120 mm
D—12 mm

L—120 mm
D—12 mm

L—120 mm
D—12 mm

L—120 mm
D—12 mm
Connector typeBNC waterproof—mini-DIN (star)

BNC waterproof—mini-DIN (star)*

BNC waterproof—mini-DIN (star)* 3 m

BNC waterproof—mini-DIN (star)*

BNC waterproof—mini-DIN (star)* 3 m
BMC waterproof—mini-DIN
We have an of extensive inventory of Triode Electrodes also available ›
 High performance in all samplesFast response –
even in difficult
samples
For all samples including solventsFast response in difficult samples & soils
 ROSS Sure-Flow combo pH glass body electrodesROSS Sure-Flow combo pH epoxy body electrodesSure-Flow combo pH glass body electrodesSure-Flow combo pH epoxy electrodes
 ROSS Sure-Flow combination pH electrode with glass bodyROSS Sure-Flow combination pH electrode with epoxy bodySure-Flow combination pH electrode with glass bodySure-Flow combination pH electrode with epoxy body
 
  • Sure-Flow junction prevents clogging
  • For soil, sludge, colloids, viscous material and organic solvents
  • Ideal for soil samples
  • Durable epoxy design
  • For TRIS, sulfides and proteins
  • For soil, sludge, colloids, and viscous material
  • Chemical resistant glass body
  • Rugged, durable epoxy design
  • Has removable bulb guard
Product SKU number8172BNWP8165BNWP
9172BNWP9165BNWP
pH Range0-140-140-140-14
pH Precision0.010.010.020.02
Temp. Range0-100°C0-100°C0-100°C0-100°C
Internal ReferenceROSSROSSAg/AgClAg/AgCl
JunctionSure-FlowSure-FlowSure-FlowSure-Flow
Fill Solution (Cat. No.)3 M KCl (810007)3 M KCl (810007)4 M KCl w/ Ag/AgCl (900011)4 M KCl w/ Ag/AgCl (900011)
Dimension D (Dia) L (Length) T (Tip)

L - 120 mm
D - 12 mm

L - 120 mm
D - 12 mm

L - 120 mm
D - 12 mm

L - 120 mm
D - 12 mm

Connector TypeBNC Waterproof

BNC Waterproof
EDIN Waterproof

BNC WaterproofBNC Waterproof
  Increase your productivity by adding accessories to your benchtop or portable meter. Meter Accessories ›

 Sustainably created Silver/Silver Chloride Electrode for daily useGeneral Purpose Combination Silver/Silver Chloride Electrode Economy Silver/Silver Chloride Electrode for routine measurements
    
 Orion Green pH Combination ElectrodeOrion Combination pH ElectrodeOrion Economy pH Combination Electrode
 
  • For routine pH measurements
  • Mercury and lead free
  • Available in flat surface, flask, general purpose, or semi-micro tip
  • For general purpose pH measurements
  • Glass body for higher temp solutions, to up to 90°C
  • For routine pH measurements
  • Unbreakable epoxy body for rugged conditions
  • Available in flat surface, flask, general purpose, or semi-micro tip
Product SKU numberGD9106BNWP9102BNWP 913600
pH Range0-140-140-12
Temp. Range0°C to 80°C0°C to 90°C0°C to 80°C
JunctionWickCeramicWick
FillingOrion Ag/AgCl double-junction filling solutionOrion Ag/AgCl electrode filling solutionPermanently gelled Ag/AgCl electrolyte
MaterialEpoxy body, Ag/AgCl referenceGlass body, Ag/AgCl referenceEpoxy body, Ag/AgCl electrolyte
RefillableYesYesNo
Dimension D (Dia) L (Length) T (Tip)

L – 11 cm
D – 12 mm

L – 12 cm
D – 12 mm
L – 11 cm
D – 12 mm
Connector TypeWaterproof BNC

Waterproof BNC

Waterproof BNC
 ShopShopShop

Select your electrode by application

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 electrodesAlso available
pH & temperature

 8302BNUMD [G]
8107BNUMD[E]

9107BNMD [E]
8107BNUMD [E]
Low maint & rugged epoxy bodyGD9106BNWP[E]9106BNWP  [E]
GS9106BNWP [E]
Long life & chemical resistant8102BN [G]
8102BNUWP [G]
9102BNWP [G]
9102DJWP [G]
Clog-resistant8172BNWP [G]
8165BNWP [E]
GS9106BNWP [E]
9172BNWP [G]
9165BNWP [E]
Rugged bulb & chemical resistant8104BN [G]
8104BNUWP [G]
9104BNWP [G]
9162BNWP [G]

^ Top  

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 electrodesAlso available
pH & temperature8302BNUMD [G]9107BNMD [E]
8107BNUMD [E]
Low maint & rugged epoxy bodyGD9106BNWP[E]
8107BNUMD [E]
9106BNWP[E]
GS9106BNWP [E]
Long life & chemical resistant8102BN [G]
8102BNUWP [G]
9102BNWP [G]
9102DJWP [G]
Clog-resistant8172BNWP [G]
8165BNWP [E]
GS9106BNWP [E]
9172BNWP [G]
9165BNWP [E]
Rugged bulb & chemical resistant8104BN [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 electrodesAlso available
pH & temperature8302BNUMD [G]  
8157BNUMD [E]
 8302BNURCA [G]
8157BNURCA [E]
8107BNUMD [E]
8107BNURCA [E]
Long life & chemical resistant8102BNUWP [G]9102DJWP [G]
8102BN [G]
Semi-micro size 8103BN [G]
8103BNUWP [G]
911600 [E]
9110DJWP [G]
8115BN[E]
8115BNUWP [E]
Micro size8220BNWP [G]9810BN [G]
9863BN [--]
Titrations8172BNWP [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 electrodesAlso 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 electrodesAlso 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 electrodesAlso 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 electrodesAlso 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 electrodesAlso available
pH & temperature8302BNUMD [G]9157BNMD [E]
8157BNUMD [E]
Easy  maintenance, flushable junction8172BNWP [G]
8165BNWP [G]
9172BNWP [G]
9165BNWP [E]
Rugged epoxy body8165BNWP [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 electrodesAlso available
pH & temperature8302BNUMD [G]9107BNMD [E]
9157BNMD [E]
Extreme pH (<2 or >12) & Brines8172BNWP [G]GD9106BNWP [E]
9172BNWP [E]
Viscous—slurry, emulsion, wet sludge8172BNWP  [G]9104APWP[G]
9172BNWP [G]
Flat surface—paper, dewatered sludge, textiles8135BN [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 electrodesAlso available
pH & temperature8107BNUMD [E]9104BNWP [G]
9107APMD [E]
Clog-resistant & easy to clean8172BNWP [G]
9104APWP [G]
9172BNWP [G]
9165BNWP [E]
Clog resistant & rugged bodyGD9106BNWP [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 electrodesAlso available
pH & temperature8107BNUMD [E]9107BNMD [E]
9157BNMD [E]
Clean waters—potable, surface, ground, drinking, treated effluent815600 [E]
8156BNUWP [E]
9156APWP [E]
9162BNWP [G]
Wastewater8172BNWP [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 electrodesAlso available
pH & temperature8302BNUMD [G]
8107BNUMD [E]
9107BNMD [E]

Low maint & rugged epoxy bodyGD9106BNWP [E]9106BNWP [E]
GS9106BNWP [E]
Long life & chemical resistant8102BN [G]
8102BNUWP [G]
9102BNWP [G]
9102DJWP [G]
Clog-resistant8172BNWP [G]
8165BNWP [E]
GS9106BNWP[E]
9172BNWP [G]
9165BNWP [E]
Rugged bulb & chemical resistant8104BN [G]
8104BNUWP [G]
9104BNWP [G]
9162BNWP [G]

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pH Buffers and Solutions

Using high-quality solutions to calibrate and maintain your sensors is the best way to ensure your data is both accurate and reproducible. When choosing buffers and solutions for pH measurement, pay attention to the quality of the water and chemicals used. Use USP grade water whenever possible.

Avoid using low-quality, reconstituted, or expired buffers. These can lead to measurement errors, which require lengthy troubleshooting, or may go unnoticed. Our bottles of buffers have a safety seal to eliminate leaking during shipment and as a tamper-proof measure.

Featured pH buffers and test kits

We offer pH buffers and test kits for a variety of applications. All Orion pH buffers and standards are traceable to NIST reference materials and are available in a variety of sizes ranging from 15 mL single-use pouches to large-volume 19 L cubitainers.

Orion pH Buffer
Individual Use Pouches

  • Color coded: pH 4.01 buffer is pink, pH 7.00 buffer is yellow, and pH 10.01 buffer is blue
  • Packaged with buffer/temperature tables for accurate calibrations and NIST traceability
  • Manufactured under ISO 9001 quality standards
  • Pouches are 15mL each and are available in 10 packs or 25 packs

Container sizes: pH buffers and ORP standards

All Orion pH buffer bottles have pH/temperature tables printed on the labels for accurate calibrations and NIST traceability, manufactured under ISO 9000 quality standards. The buffers are available in pint (475 mL) bottles, portable five packs of 2 oz. (5 x 60 mL) bottles, convenient All-in-One buffer kits, 5 gallon (19 L) cubitainers, and single-use pouches. See the table below to identify which size buffers and standards are necessary for your applications.

 LaboratoryFieldPharmaceuticalSingle useFood and
beverage
15 mL (0.5 oz.) individual use pouches > available in 10 pack or 25 pack boxes

60 mL (2 oz.) bottle > available in 5 pack box

 

475 mL (1 pint) bottle

 

 

1 L (0.25 gallon) bottle

 

 

4 L (1 gallon) bottle

 

 

19 L (5 gallon) cubitainer

 

 

810007 ROSS Filling Solutions

pH electrode and reference electrode fill solutions

Ensure the proper performance and function from your electrode by using our specially formulated fill solutions. Use Thermo Scientific Orion pH Electrode Filling Solution with pH electrodes and reference electrodes. Packaged as five 2 oz. (5 x 60 mL) bottles.

Which fill solution should I use?

SolutionDescriptionUse with electrodes
810007ROSS electrode fill solution, 3 M KCl, 5 x 60 mLROSS Ultra, ROSS and Micro ROSS Electrodes
800300800500U8102BN8102BNUWP, 8103BN, 8103BNUWP, 8104BN, 8104BNUWP, 8115BN, 8115BNUWP, 8135BN, 8135BNUWP, 815600, 8156BNUWP, 8157BNU, 8157BNUMD, 8157UWMMD, 8163BNWP, 8165BNWP, 8172BNWP, 8175BNWP, 8220BNWP, 8302BNUMD
900011Silver Chloride pH electrode fill solution, 4 M KCl with Ag/AgCl, 5 x 60 mLStandard, Specialty, Single Junction Refillable Green, Micro and ORP Electrodes
9102BNWP, 9103BNWP, 9104BNWP, 9156BNWP, 9157BN, 9157BNMD, 9162BNWP, 9165BNWP, 9172BNWP, 9180BNMD, 9678BNWP, 9778BNWP, 9780SC, 9810BN, 9826BN, 9863BN, GS9156BNWP
900004Silver Chloride pH electrode (low level) fill solution, 2 M KCl with Ag/AgCl,
5 x 60 mL
Standard, Specialty, Single Junction Refillable Green, Micro and ORP Electrodes (low ionic strength samples)
9102BNWP, 9103BNWP, 9104BNWP, 9156BNWP, 9157BN, 9157BNMD, 9162BNWP, 9165BNWP, 9172BNWP, 9180BN, 9180BNMD, 9678BNWP, 9778BNWP, 9780SC, 9810BN, 9826BN, 9863BN, GS9156BNWP
910008-WADouble junction pH
electrode fill solution, 3 M KCl, 5 x 60 mL
Double Junction, Double Junction Refillable Green and KNIpHE Electrodes
9102DJWP, 9110DJWP, 9120APWP, GD9156BNWP
510011No Cal pH electrode fill solution, 5 x 60 mLNo Cal Electrodes
5107BNMD, 5107NC
610001pHuture pH electrode fill solution, 5 x 60 mLpHuture Electrodes
900001Single junction reference electrode fill solution, equitransferent solution with Ag/AgCl, 5 x 60 mLSingle Junction Reference Electrode
900100
900002Double junction reference electrode inner fill solution, equitransferent solution with Ag/AgCl, 5 x 60 mLDouble Junction Reference Electrode
900200
900003Double junction reference electrode outer fill solution, 10% KNO3, 5 x 60 mLDouble Junction Reference Electrode
900200

pH electrode accessories

AccessoryFor use with Description
Electrode Storage Bottles and Bulb Guards

Bulb guards can be used with glass-bodied standard or Sure-Flow pH Electrodes.

Bottles can be used with any 6, 8, or 12 mm bottle. 

The bulb guard fits over the electrode and will not interfere with the Sure-Flow flushing action.
Orion Electrode Adapter CablesAny legacy Orion pH Electrode or other brand electrode for use with an Orion Star or Versa Star Meter.Convert an electrode with one connector to the required connector of another meter with an electrode adapter cable.
Orion Electrode Extension CablesOrion ATC probes, any reference electrode with 2mm pin tip connector or any electrode with a BNC connector.Extend the length of an electrode cable by 15′ (4.57m) with the extension cable.
Orion Storage Sleeve and BasepH electrodes that are 120mm or less in length that have a .diameter of 12mmThe sleeve protects your electrode from breakage when not in use and will not tip. The pH bulb stays conditioned while in storage so that it is ready to use when removed from the sleeve.
Orion Swing Arm Electrode StandAll Orion electrodes and probes.Weighted base, swing arm and electrode holder that accepts up to four electrodes or probes, and a stirrer probe.
Orion Star A Series Electrode Holder for Electrode StandsAll Orion electrodes and probesHolds up to six 15mm conductivity and DO probes.

Orion solutions, standard and buffers

Orion solutions, standards and buffers portfolio

Using high-quality solutions to calibrate and maintain your sensors is the best way to ensure your data is both accurate and reproducible. Learn more about why high-quality solutions deliver correct measurements every time.  

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