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Micro-invasive CO2 Monitoring
Needle-type CO2 Microsensor NTH-CDM1
The NTH-CDM1 is designed for measuring in small volumes. The sensor is based on a silica fiber with 250 µm tip diameter, which enables integration into manifold small scale environments. With its protective syringe needle housing the NTH-CDM1 can easily penetrate tissue, septum rubber or packaging materials. After penetration, the sensor tip is extended for measurements.
- CO2 measurement in liquids (0.04 to 5 % CO2)
- High spatial resolution (250 µm)
- Ideal for physiological solutions
- Precise on-the-spot measurements
Applications
CO2 Monitoring at the Sediment-Water Interface
The PreSens CDM1 CO2 probes combined with PreSens Micromanipulators are ideally suited for profiling applications. Profiling in salt marsh ponds with our optical probes showed, that while oxygen levels are strongly affected by microbial photosynthetic activity, pH and CO2 at the sediment surface was unaffected by varying light conditions suggesting a high buffering capacity of the pond water and sediment.
(Application Note K. Koop-Jakobsen et al.)
CO2 Measurements in Plant & Animal Physiology
CO2 is an important parameter in respiration and metabolic processes. PreSens CDM1 CO2 probes are ideally suited for measurements in animal or plant research. Due to their small size, they can be integrated in many set-ups where CO2 electrodes would not fit. The graph on the left shows in vivo CO2 measurements in the haemolymph of a water-breathing dragonfly nymph.
(Application Note D. J. Lee et al.)
Monitoring CO2 in Fish Digestive Tracts
Needle-mounted PreSens fiber optic pCO2 microsensors proved to be ideal for measurements inside fish digestive tracts, as it was important to insert the sensor without rupturing the tract. The needle could be inserted through the wall of the tract directly into the desired location, allowing sequential monitoring of pCO2 in various sections of the gut. These measurements demonstrated that the pCO2 in the digestive tract is surprisingly high even in fasted fish, far above blood level, and is markedly elevated after feeding in teleosts.
(Application Note C. M. Wood et al.)
Technical
| Specifications*/** | |
|---|---|
*preliminary data | |
| Measurement range | 0.04 - 5 % CO2 at atmospheric pressure |
| Response time (t90) for a CO2 change from 0.5 to 1 % | < 5 min (at 25 °C) < 3 min (at 37 °C) |
| Resolution at 25 °C | ± 0.01 % at 0.1 % CO2 ± 0.1 % at 1 % CO2 |
| Spatial resolution | 250 µm |
| Measurement temperature range*** | From + 12 °C to + 42 °C |
| Properties** | |
| Compatibility | Aqueous solutions, pH 4 to 9 |
| Cross-sensitivity | Organic solvents, volatile acids (e.g. HCl vapors, acetic acid) and sulfidic environments damage the sensor irreversibly |
| Calibration | CO2 sensors are pre-calibrated at the required temperature***; re-calibration is possible and recommended |
Related products
Implantable CO2 Microsensor IMP-CDM1
The implantable CO2 Microsensor IMP-CDM1 is not mounted into…
Resources
Publications
Direct Measurements of pCO2 in the Digestive Tract of Fish
In vivo Monitoring of Haemolymph pCO2 in Dragonfly Nymphs to Determine the Resting State Value
O2, pH and CO2 Dynamics in Salt Marsh Tidal Ponds
The gaseous gastrointestinal tract of a seawater teleost, the English sole (Parophrys vetulus)
Changes in hemolymph total CO2 content during the water-to-air respiratory transition of amphibiotic dragonflies