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.
prev
next
fade
9999999999
%showbuttons%
1000
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.
Print
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 |
-10o-60o |
|
|
| |
Tip tolerance temp range |
-10o-90o |
|
|
| |
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).
|
