RD-100
Needle sensor
Ref-RM
pH Redox UniAmp
Designed for research applications within:
Environmental Sciences
Biomedical Sciences
Biotechnology
Microbiology

Redox microelectrode

Measure redox potential in microenvironments

With the tip size down to 10 µm, less than 5 seconds in response time, and 1 mV in resolution, you will get reliable and fast measurements of redox potential. Read more...

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Technical Data
Ordering Information & Sizes
Adaptations
Manuals & Videos
Redox

Redox measurement technology

The Redox microelectrode tip will develop an electrical potential relative to the reference electrode when both electrodes are immersed in the same solution and connected to a high-impedance millivoltmeter, such as the UniAmp. This potential reflects the tendency of the solution to release or take up electrons; also called the Oxidation-Reduction Potential (ORP). The Unisense Redox microelectrode can be used for measurements in salinities from 0 to full ocean strength.

The reference electrode can be either external (separate electrode) or internal. However, we only recommend internal references in applications where it is not possible to place two electrodes in the sample.

RD and Ref_1400x800
General
Cables & Connectors
Characteristics
Response Time
General
Feature Standard Options Extra price for option selection
Total length 150-200 mm 70-350 mm 20-50%
Diameter 20 mm from tip <2 mm <1 mm 10%
Diameter 50 mm from tip 8 mm <2 mm 20%
Glass shaft diameter 8 mm
Plastic shaft protection diameter* 11 mm Can be omitted

*When mounted with in situ mini connectors, the shaft has no protection mounted, but fits directly into the in situ sensor mounts with pressure compensation. In situ sensors have a standard length of 130-160 mm.

Cables & Connectors
Item Standard Options Extra price for option selection
Cable Habia
Cable length 1.5-2 m 0-20 m Yes, depends on length
Connector LEMO BNC adapter Yes, order separately
In situ mini connectors* No Yes

*When mounted with in situ mini connectors, the shaft has no protection mounted, but fits directly into the in situ sensor mounts with pressure compensation. In situ sensors have a standard length of 130-160 mm.

Characteristics
Attribute Standard Options Extra price for option selection
Guaranteed lifetime 3 months
Expected lifetime >1 year
Temperature range -10-60°C
Temperature range tip -10-60°C
Detection limit 0.1 mV
Internal reference Only as RD-500C*
Waterproof Yes
Pressure tolerant tip Yes
Spatial resolution Equals outside tip diameter
Electrolyte with fluorescein (fluorescent) No Yes 10%

*Construction of the sensor with an internal reference involves creation of a liquid junction 1-2 mm from the electrode tip. During measurements this liquid junction must be submersed in the medium in order to complete the measurement circuit.

Response Time
Response time (90%) <10 s
Ordering information & Sizes
Ordering information & Sizes
Redox Glass Electrode Size and description Options Extra price for option selection
RD-10 8-12 µm - microelectrode 3-5 µm 20%
RD-25 20-30 µm - microelectrode
RD-50 40-60 µm - microelectrode
RD-100 90-110 µm - microelectrode
RD-200 175-225 µm - microelectrode
RD-500 400-600 µm - minielectrode 110-400 µm 20%
RD-500C 400-600 µm (combination electrode with internal reference electrode)
RD-MR 400-600 µm - in guide
RD-N 1.1 x 40 mm - needle electrode
RD-NP 1.6 x 40 mm - needle electrode for piercing
RD-ST-1/4 1/4'' steel tube
RD-SL-1/4 FT-cell 1/4'' Swagelok Tee
RD-SL-1/8 FT-cell 1/8'' Swagelok Tee
RD-PEEK-1/8 FT-cell 1/8'' PEEK Tee
RD-PEEK-1/16 FT-cell 1/16'' PEEK Tee
RD-FT-GLASS-6 Glass FT-cell 6 mm outer diameter
RD-FT-GLASS-8 Glass FT-cell 8 mm outer diameter

Video Guides

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Quick Guide Redox Microelectrodes

A short presentation of how we make Redox microelectrodes, how you can use them, and a look at specifications and customizations.

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Redox Calibration Kit Video

Application Scientist Tage Dalsgaard shows you how to perform a calibration using the Redox electrode calibration kit

Related publications

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Contrasting effects of the polychaetes Marenzelleria viridis and Nereis diversicolor on benthic metabolis⁠…
Kristensen, Erik et all (2011), Marine Ecology Progress Series, vol. 425, 125-139
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02
Novel [NiFe]- and [FeFe]-hydrogenase gene transcripts indicative of active facultative aerobes and obliga⁠…
Schmidt, Oliver et all (2011), Applied and Environmental Microbiology, vol. 77, 5842-5850
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