Laboratory ORP Sensors: The Right Metal for Your ORP Application

Laboratory ORP Sensor

ORP/Redox Electrodes and Probes for Fast and Reliable Measurements

Fast, Reliable ORP Electrodes

We offer a versatile portfolio of high-quality laboratory ORP electrodes. This means you can find the right combination of reference system, junction, metal and shape to support accuracy in any application from basic day-to-day monitoring to highly specialized workflows.

ORP electrodes with different lengths easily measure any sample size with utmost accuracy. High-quality construction and materials assure dependable accuracy and long sensor lifetimes, even when you work with challenging samples.

 
 

Reliable Meters

pH Meters

We offer a variety of durable benchtop and portable meters that work seamlessly with your laboratory ORP probe or field sensor. Our portfolio has options to meet your needs for compliance and routine measurements, and it includes economical models for those working under tight budgets.

Benchtop MetersPortable Meters

Quality Solutions

ORP Standards

The results you obtain with your laboratory or field ORP sensor are only as accurate as the standards you use for verification. We offer quality standards in small bottles that help to eliminate contamination risk, ensure reliable ORP/redox readings, and validate your measurement results.

Learn More about ORP StandardsLearn More about Maintenance Solutions

Expert Application Support

Service for pH meters and sensors

Our pH Competence and Support Center (pH CSC) offers you easy access to dedicated application specialists for your pH, ORP, ion, conductivity, and DO measurements. These specialists provide know-how and collaborate with product management and development to help ensure a high degree of success in all your critical electrochemical analyses.

Learn More about the pH CSC
 
Analytical Instruments

Products and Specs

 
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Metal
Temperature range
Connector
Type of junction
Shaft Material
Material No.: 51343200
MetalPlatinum ring ;
Temperature range0 °C ; 100 °C ;
ConnectorS7 ;
Type of junctionCeramic ;
Shaft MaterialGlass ;
Sensor TypeCombined electrode ;
Shaft length120 mm ;
Shaft Diameter12 mm ;
ParameterORP ;
Reference SystemARGENTHAL™ with Ag+-trap ;
Reference electrolyte3 mol/L KCl ;
Intelligent Sensor Management (ISM®)No ;
Temperature probeNo ;
Signal typeAnalog ;
SampleGeneral Purpose ;
Reference electrolyte Order no.51343180 ;
Material No.: 51343205
MetalSilver ring ;
Temperature range0 °C ; 100 °C ;
ConnectorS7 ;
Type of junctionCeramic ;
Shaft MaterialGlass ;
Sensor TypeCombined electrode ;
Shaft length120 mm ;
Shaft Diameter12 mm ;
ParameterORP ;
Reference SystemARGENTHAL™ with Ag+-trap ;
Reference electrolyte1 mol/L KNO3 ;
Intelligent Sensor Management (ISM®)No ;
Temperature probeNo ;
Signal typeAnalog ;
SampleGeneral Purpose ;
Reference electrolyte Order no.51343182 ;
Material No.: 59904391
MetalSilver ring ;
Temperature range-30 °C ; 130 °C ;
ConnectorS7 ;
Type of junction-- ;
Shaft MaterialGlass ;
Sensor TypeHalf-cell ;
Shaft length120 mm ;
Shaft Diameter12 mm ;
ParameterORP ;
Reference System
Reference electrolyte
Intelligent Sensor Management (ISM®)No ;
Temperature probeNo ;
Signal typeAnalog ;
SampleGeneral Purpose ;
Reference electrolyte Order no.
Material No.: 59904408
MetalSilver tip ;
Temperature range-30 °C ; 130 °C ;
ConnectorS7 ;
Type of junction-- ;
Shaft MaterialPP ;
Sensor TypeHalf-cell ;
Shaft length120 mm ;
Shaft Diameter12 mm ;
ParameterORP ;
Reference System
Reference electrolyte
Intelligent Sensor Management (ISM®)No ;
Temperature probeNo ;
Signal typeAnalog ;
SampleGeneral Purpose ;
Reference electrolyte Order no.
Material No.: 51343204
MetalGold Ring ;
Temperature range0 °C ; 100 °C ;
ConnectorS7 ;
Type of junctionCeramic ;
Shaft MaterialGlass ;
Sensor TypeCombined electrode ;
Shaft length120 mm ;
Shaft Diameter12 mm ;
ParameterORP ;
Reference SystemARGENTHAL™ with Ag+-trap ;
Reference electrolyte3 mol/L KCl ;
Intelligent Sensor Management (ISM®)No ;
Temperature probeNo ;
Signal typeAnalog ;
SampleHighly oxidizing samples ;
Reference electrolyte Order no.51343180 ;
Material No.: 51343201
MetalPlatinum ring ;
Temperature range0 °C ; 100 °C ;
ConnectorS7 ;
Type of junctionMovable glass sleeve ;
Shaft MaterialGlass ;
Sensor TypeCombined electrode ;
Shaft length120 mm ;
Shaft Diameter12 mm ;
ParameterORP ;
Reference SystemARGENTHAL™ with Ag+-trap ;
Reference electrolyte3 mol/L KCl ;
Intelligent Sensor Management (ISM®)No ;
Temperature probeNo ;
Signal typeAnalog ;
SampleEmulsion ;General Purpose ;waste water ;
Reference electrolyte Order no.51343180 ;
Material No.: 51343203
MetalPlatinum ring ;
Temperature range0 °C ; 100 °C ;
ConnectorS7 ;
Type of junctionCeramic ;
Shaft MaterialGlass ;
Sensor TypeCombined electrode ;
Shaft length100 mm ;
Shaft Diameter6 mm ;
ParameterORP ;
Reference SystemARGENTHAL™ with Ag+-trap ;
Reference electrolyte3 mol/L KCl ;
Intelligent Sensor Management (ISM®)No ;
Temperature probeNo ;
Signal typeAnalog ;
SampleSmall samples ;
Reference electrolyte Order no.51343180 ;
Material No.: 59904377
MetalPlatinum ring ;
Temperature range-30 °C ; 130 °C ;
ConnectorS7 ;
Type of junction-- ;
Shaft MaterialGlass ;
Sensor TypeHalf-cell ;
Shaft length120 mm ;
Shaft Diameter12 mm ;
ParameterORP ;
Reference System
Reference electrolyte
Intelligent Sensor Management (ISM®)No ;
Temperature probeNo ;
Signal typeAnalog ;
SampleGeneral Purpose ;
Reference electrolyte Order no.
Material No.: 51343202
MetalPlatinum ring ;
Temperature range0 °C ; 100 °C ;
ConnectorS7 ;
Type of junctionCeramic ;
Shaft MaterialGlass ;
Sensor TypeCombined electrode ;
Shaft length170 mm ;
Shaft Diameter12 mm ;
ParameterORP ;
Reference SystemARGENTHAL™ with Ag+-trap ;
Reference electrolyte3 mol/L KCl ;
Intelligent Sensor Management (ISM®)No ;
Temperature probeNo ;
Signal typeAnalog ;
SampleLarge samples ;
Reference electrolyte Order no.51343180 ;
Comparison

Documentation

Product Brochures

InLab® Sensors
The manufacturing of high quality sensors with outstanding performance not only requires technical skills and expertise but also a profound understand...

FAQ

How to store ORP sensors correctly?

All user manuals come with the necessary information about the short and long term storage of the respective probe.

General tips for long term storage:

ORP electrodes should be stored in the wetting cap filled with reference electrolyte (often 3 mol/L KCl).

How to clean an ORP Sensor?

Several factors can lead to the blockage of ORP sensor diaphragms. In particular, junctions made of ceramic, or other porous material are prone to clogging. The most frequent reasons are listed here together with the respective cleaning procedures:

Blockage with silver sulfide (Ag2S): if the reference electrolyte contains silver ions and the sample being measured contains sulfides, the junction will get contaminated with a silver sulfide precipitate. To clear the junction of this contamination, clean it with 8% thiourea in 0.1 mol/L HCl solution (Thiourea Cleaner is available from METTLER TOLEDO).

Blockage with silver chloride (AgCl): the silver ions from the reference electrolyte can also react with samples that contain chloride ions, resulting in an AgCl precipitate. This precipitate can be removed by soaking the electrode in a concentrated ammonia solution (35% NH3 aq.).

Blockage with proteins: junctions contaminated with proteins can often be cleaned by immersing the electrode in a pepsin/HCl (5 % pepsin in 0.1 mol/L HCl) solution for several hours (Pepsin-HCl Cleaner is available from METTLER TOLEDO).

Other junction blockages

If the junction is blocked with other contaminations, try cleaning the ORP sensor in an ultrasonic bath with water or with a 0.1 mol/L HCl solution.

Which ORP sensor should be used?

Redox electrodes with a platinum ring are the "standard" ORP sensors. This is why we have it with different geometries and junctions (e.g. InLab® Redox Micro, InLab® Redox Pro). Redox electrodes are only used if anything in the sample undergoes a chemical reaction with platinum -- the idea behind the noble metal ring is to not be involved in any chemical reaction. One example where a platinum redox electrode is not recommended is concentrated hydrochloric acid because Pt-Clcomplexes can be produced.

Know the Risk of Your pH Measurement
Ion Selective Electrode Guide – Theory and Practice
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pH Toolbox for Life Sciences
pH Theorie Guide
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