H2 Microsensor

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H₂ Microsensor

Hydrogen microsensor with a tip diameter of 50 µm.

The hydrogen microsensor can be mounted in a sensor guide to fit with the MicroRespiration System.

The hydrogen microsensor can be mounted with a steel needle to make it stronger on the longitudinal axis.

The hydrogen microsensor signal must be amplified on a Unisense amplifier e.g. the laboratory Microsensor Multimeter.

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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
Biotechnology
Research on photochemical water splitting
Effect of H₂ enriched drinking water

Microsensor technology

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 %).

Ordering Information

Standard Glass Sensor	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
H₂-500LR	400-600 µm - for low concentration range applications
H₂-MR	400-600 µm
H₂-N	1,1 x 40 mm - needle sensor
H₂-NP	1,6 x 40 mm - needle sensor for piercing
H₂-NPLR	1,6 x 40 mm - needle sensor for piercing and for low concentration range

Find complete hydrogen microsensor specifications, including warranty and expected life time, below and possible microsensor customizations and adaptations under Related Products found to the right.

Hydrogen Sensor

Note: BNC connections are discontinued as of August 1. 2010. Adapters are available from Unisense to support compatibility to legacy sensors and instrumentation.

		Standard	Options	Extra price for option selection
Glass sensors	Outside tip diameter	H₂-10 (8-12µm) H₂-25 (20-30µm) H₂-50 (40-60µm) H₂-100 (90-110µm) H₂-500 (400-600µm) H₂-MR	3-5 µm 100-400 µm 600-800 µm	20% 20%
	Diameter 20mm from tip	< 2mm	< 1mm	10%
	Diameter 50mm from tip	8mm	< 2mm	20%
Needle sensors	Needle length (H2-N)	40mm	See Customizations	+ 10%
	Needle diameter (H2-N)	1.1mm	See Customizations	+ 10%
	Position of sensing tip	Exposed, but protected
All sensors	Total length	150-200mm	70-350mm	20-50%
	Glass shaft diameter	8mm
	Plastic shaft protection diameter*	11mm
	Cabling etc.
	Cable	Habia
	Cable length	1.5-2m	0-20 m	Yes, depends on length
	Connector	LEMO	BNC adapter	yes, order separately
	In situ gold pin connector	No	Yes
	Characteristics
	Internal reference	Yes		-
	Water proof	Yes
	Temperature range	-10^o-60^o
	Tip tolerance temp range	-10^o-90^o
	Guaranteed life time	3 months
	Expected life time	> 3 months
	Spatial resolution	Equals outside tip diameter
	Temperature coefficient	2-3% per ^oC
	Range	0-800 µM dissolved H₂(0-1 atm pH₂₎ Low Range Sensors: 0-80 µM (approx. 0-10%)
	Detection limit	0.3µM in water <50nM for Low Range Sensors - available for tip sizes ≥ 50 µm	Low Range < 50 nM or High Range > 800 µM	20%
	Known Interferences	H₂S (about 10%), Alcohols
	Stirring sensitive**	Yes	No
	Response time (80%)	H₂-10, H₂-25, H₂-50: < 10 sec H₂-100: < 15 sec H₂-500: < 30 sec H₂-N/NP: < 30 sec H₂-MR: < 30 sec
	Response	Linear

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 140 mm ± 5 mm.

In the standard design the hydrogen sensor is optimized paying respect to optimal sensitivity as most applications implies detection of low hydrogen partial pressure. It can however be useful to use sensors without stirring sensitivity to some applications. Due to the nature of the sensor function, it is however not possible to optimize sensitivity (high signal) and low stirring sensitivity simultaneously, so there will always be a trade of between these parameters. Sensors that is made stirring insensitive will have al lower signal as a function of hydrogen partial pressure and thereby a lower sensitivity (about 0.5µM H2 in water).

Technical information

Hydrogen Sensor

Note: BNC connections are discontinued as of August 1. 2010. Adapters are available from Unisense to support compatibility to legacy sensors and instrumentation.

		Standard	Options	Extra price for option selection
Glass sensors	Outside tip diameter	H₂-10 (8-12µm) H₂-25 (20-30µm) H₂-50 (40-60µm) H₂-100 (90-110µm) H₂-500 (400-600µm) H₂-MR	3-5 µm 100-400 µm 600-800 µm	20% 20%
	Diameter 20mm from tip	< 2mm	< 1mm	10%
	Diameter 50mm from tip	8mm	< 2mm	20%
Needle sensors	Needle length (H2-N)	40mm	See Customizations	+ 10%
	Needle diameter (H2-N)	1.1mm	See Customizations	+ 10%
	Position of sensing tip	Exposed, but protected
All sensors	Total length	150-200mm	70-350mm	20-50%
	Glass shaft diameter	8mm
	Plastic shaft protection diameter*	11mm
	Cabling etc.
	Cable	Habia
	Cable length	1.5-2m	0-20 m	Yes, depends on length
	Connector	LEMO	BNC adapter	yes, order separately
	In situ gold pin connector	No	Yes
	Characteristics
	Internal reference	Yes		-
	Water proof	Yes
	Temperature range	-10^o-60^o
	Tip tolerance temp range	-10^o-90^o
	Guaranteed life time	3 months
	Expected life time	> 3 months
	Spatial resolution	Equals outside tip diameter
	Temperature coefficient	2-3% per ^oC
	Range	0-800 µM dissolved H₂(0-1 atm pH₂₎ Low Range Sensors: 0-80 µM (approx. 0-10%)
	Detection limit	0.3µM in water <50nM for Low Range Sensors - available for tip sizes ≥ 50 µm	Low Range < 50 nM or High Range > 800 µM	20%
	Known Interferences	H₂S (about 10%), Alcohols
	Stirring sensitive**	Yes	No
	Response time (80%)	H₂-10, H₂-25, H₂-50: < 10 sec H₂-100: < 15 sec H₂-500: < 30 sec H₂-N/NP: < 30 sec H₂-MR: < 30 sec
	Response	Linear

Hydrogen Microsensor Manual (PDF)

Product Sheet Microsensors (PDF)

Microsensors in Water Splitting Studies (PDF)

Hydrogen in solar energy studies (PDF)

Related publications

Sick, Torben et al (2018), Oriented Films of Conjugated 2D Covalent Organic Frameworks as Photocathodes for Water Splitting, Journal of the American Chemical Society, 2085 - 2092, vol. 140 Read abstract

Sherman, Benjamin D. et al (2016), A Dye-Sensitized Photoelectrochemical Tandem Cell for Light Driven Hydrogen Production from Water, Journal of the American Chemical Society, 16745 - 16753, vol. 138 Read abstract

Kajiya, Mikihito et al (2009), Hydrogen from intestinal bacteria is protective for Concanavalin A-induced hepatitis, Biochemical and Biophysical Research Communications, 316 - 321, vol. 386 Read abstract

Brand, Andreas 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

See all publications

Unisense user workshop

Do you want to learn more about microsensors? We invite customers to join one of our user workshops here at Unisense. The program is a mix of theoretical lectures and hands-on experiments.

H₂ Microsensor

Highly sensitive hydrogen microsensor

Microsensor technology

Ordering Information