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
Feature
Total length
Standard
150-200 mm
Options
70-350 mm
Extra price for option selection
20-50%
Feature
Diameter 20 mm from tip
Standard
<2 mm
Options
<1 mm
Extra price for option selection
10%
Feature
Diameter 50 mm from tip
Standard
8 mm
Options
<2 mm
Extra price for option selection
20%
Feature
Glass shaft diameter
Standard
8 mm
Feature
Plastic shaft protection diameter*
Standard
11 mm
Options
Can be omitted
Extra price for option selection

*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
Item
Cable
Standard
Habia
Item
Cable length
Standard
1.5-2 m
Options
0-10 m
Extra price for option selection
Yes, depends on length
Item
Connector
Standard
LEMO
Options
BNC adapter
Extra price for option selection
Yes, order separately
Item
In situ mini connectors*
Standard
No
Options
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
Attribute
Guaranteed lifetime
Standard
3 months
Attribute
Expected lifetime
Standard
>1 year
Attribute
Temperature range
Standard
-10-60°C
Attribute
Temperature range tip
Standard
-10-60°C
Attribute
Detection limit
Standard
0.1 mV
Attribute
Internal reference
Standard
Only as RD-500C*
Attribute
Waterproof
Standard
Yes
Attribute
Pressure tolerant tip
Standard
Yes
Attribute
Spatial resolution
Standard
Equals outside tip diameter
Attribute
Electrolyte with fluorescein (fluorescent)
Standard
No
Options
Yes
Extra price for option selection
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
Redox Glass Electrode
RD-10
Size and description
8-12 µm - microelectrode
Options
3-5 µm
Extra price for option selection
20%
Redox Glass Electrode
RD-25
Size and description
20-30 µm - microelectrode
Redox Glass Electrode
RD-50
Size and description
40-60 µm - microelectrode
Redox Glass Electrode
RD-100
Size and description
90-110 µm - microelectrode
Redox Glass Electrode
RD-200
Size and description
175-225 µm - microelectrode
Redox Glass Electrode
RD-500
Size and description
400-600 µm - minielectrode
Options
110-400 µm
Extra price for option selection
20%
Redox Glass Electrode
RD-500C
Size and description
400-600 µm (combination electrode with internal reference electrode)
Redox Glass Electrode
RD-MR
Size and description
400-600 µm - in guide
Redox Glass Electrode
RD-N
Size and description
1.1 x 40 mm - needle electrode
Redox Glass Electrode
RD-NP
Size and description
1.6 x 40 mm - needle electrode for piercing
Redox Glass Electrode
RD-ST-1/4
Size and description
1/4'' steel tube
Redox Glass Electrode
RD-SL-1/4
Size and description
FT-cell 1/4'' Swagelok Tee
Redox Glass Electrode
RD-SL-1/8
Size and description
FT-cell 1/8'' Swagelok Tee
Redox Glass Electrode
RD-PEEK-1/8
Size and description
FT-cell 1/8'' PEEK Tee
Redox Glass Electrode
RD-PEEK-1/16
Size and description
FT-cell 1/16'' PEEK Tee
Redox Glass Electrode
RD-FT-GLASS-6
Size and description
Glass FT-cell 6 mm outer diameter
Redox Glass Electrode
RD-FT-GLASS-8
Size and description
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

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