Home Sensors & Electrodes Electric Potential microelectrode
EP-100 top
pH Redox UniAmp
Designed for research applications within:

Electric Potential microelectrode

Microelectrode to measure electric potential

With the Electric Potential Microelectrode, you can measure gradients in electric potential with very high spatial resolution thanks to the fast response and a tip diameter of 100 µm. Read more...

Read More
Technical Data
Ordering Information & Sizes
Manuals & Videos

Quantify minute differences in electric potential

The Electric Potential microelectrode was originally invented for measuring extremely small gradients in electric potential in sediments (Damgaard et al., 2014). However, it can be used in any application for quantifying minute differences in electric potential in microscale and over large distances.

The Electric Potential microelectrode measures the difference in electric potential between the tip of the Electric Potential microelectrode and the reference electrode. The principle is identical to the originally published microelectrode (Damgaard et al., 2014), and the design has been slightly modified for safe shipping. The microelectrode does not require calibration. You only need to zero the signal under measurement conditions.

The signal is shielded very effectively against electrical noise, making it possible to resolve differences in electric potential of a fraction of a mV. The microelectrode may be used at salinities between freshwater and full ocean seawater.

EP-100 2_1400x800
Cables & Connectors
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 Co-axial, 3 mm
Cable length 1.5-2 m 0-20 m Yes, depends on length
Connector LEMO BNC adapter Yes, order separately
In situ gold pin connectors No Yes
Attribute Standard Options Extra price for option selection
Guaranteed lifetime 3 months
Expected lifetime 6 months
Temperature range -10-40°C
Reference type Ag+ / AgCl
Waterproof Yes
Ordering information & Sizes
Ordering information & Sizes
Electric Potential Glass Electrode Size and description Options Extra price for option selection
EP-100 90-110 µm - microelectrode 40-60 µm | 180-200 µm 20%

Related publications

Electric potential microelectrode for studies of electrobiogeophysics
Damgaard, Lars Riis et all (2014), Journal of Geophysical Research: Biogeosciences, vol. 119, 1906-1917
Read more
Mapping electron sources and sinks in a marine biogeobattery
Risgaard-Petersen, Nils et all (2014), Journal of Geophysical Research G: Biogeosciences, vol. 119, 1475-1486
Read more