highly sensitive hydrogen microsensor
The Unisense hydrogen microsensor offers you extraordinary sensitivity allowing reliable hydrogen measurement even in natural systems. The sensor is fast responding and the tip can be miniaturized down to 2-3 µm achieving high spatial resolution.
The microsensor construction makes it possible to use the hydrogen microsensor in a broad variety of research fields where high quality, non-destructive, fast and accurate measurements are required. The hydrogen microsensor is designed for research applications within:
- Environmental sciences
- Biomedical sciences
- Research on photochemical water splitting
- Effect of H2 enriched drinking water
The hydrogen micro- and minisensors are all Clark-type sensors measuring hydrogen partial pressure. The working principle of the hydrogen microsensor is based on diffusion of hydrogen through a silicone membrane to a hydrogen oxidizing platinum anode. The reducing anode is polarized against an internal Ag/AgCl cathode. The resulting sensor signal is in the pA range and is measured by a high quality picoammeter e.g. the Unisense Microsensor Multimeter.
As hydrogen concentrations found in natural systems are generally very low, a low detection limit of the sensor is important. Generally the detection limit of the sensors is close to 0,02% of hydrogen (0,1 µM in water) but it is possible to make all but H2-10 and H2-25 sensors even more sensitive if they are provided with a large tip membrane. However, such hypersensitive sensor suffers from a considerable stirring sensitivity (up to 25 %).
part numbers and outside tip diameter
- H2-10: 8-12 µm
- H2-25: 20-30 µm
- H2-50: 40-60 µm
- H2-100: 90-110 µm
- H2-500: 400-600 µm
- H2-MR: 400-600 µm
- H2-N: 1.1 mm
- H2-NP: 1.6 x 40 mm – needle for sensor piercing
- H2-500LR: 400-600 µm – for low concentration range applications
- H2-NPLR: 1.6 x 40 mm – needle sensor for piercing and for low concentration range
related case studies and articles
Brand,A. et al (2007), Microsensor for in situ flow measurements in benthic boundary layers at submillimeter resolution with extremely slow flow, Limnology and Oceanography-Methods, 185 – 191, vol. 5
Kajiya,M. et al (2009), Hydrogen from intestinal bacteria is protective for Concanavalin A-induced hepatitis, Biochemical and Biophysical Research Communications, 316 – 321, vol. 386