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High Resolution Oxygen Measurements
Needle-Type Oxygen Microsensor NTH-PSt7
The plastic fiber with its oxygen-sensitive tip (250 µm) is protected inside a stainless steel needle and can be extended for measurements. As long as the sensor tip is retracted and sheltered inside this needle the microsensor can be pierced through septum rubber or any other harsh material. With its small tip size and fast response time (t90 < 3 s) this sensor is ideally suited for research and packaging applications, where micro-invasive and small sensors are needed.
- High spatial resolution (250 μm)
- High temporal resolution (t90 < 3 sec.)
- No consumption of oxygen
- Signal independent of flow velocity
- Measures in liquids as well as in gas phase
Applications
Tissue Engineering
Oxygen microsensors measure the oxygen content in various volume compartments of the tissue engineering constructs. To do so, hair-thin sensors are inserted into the constructs and the oxygen content is measured online. In this way, the oxygen partial pressure is measured with a high local resolution and correlated with the constructs tissue quality (composition of the extracellular matrix).
Packaging & Quality Control
Oxygen inside packaging can lead to oxidative deterioration of certain products. Therefore, determination of the oxygen content within packages or pharmaceutical vials is of essential importance to ensure both the filling quality and the long-term storage stability. With our micro-invasive needle-type oxygen microsensors we offer a simple tool to determine residual oxygen both in the headspace and in liquids. The septum of the vial or package is pierced with the needle and the sensor is extended for measurement. As the measurement is made inside the package no error-prone and time consuming sampling is necessary. These oxygen microsensors are ideal tools for quality control in the food & beverage, packaging, and pharmaceutical industries.
Technical
| Specifications | Gaseous & Dissolved O2 | Dissolved O2 |
|---|---|---|
| *at + 20 ° C, after two-point calibration **TF = flat sensor tip with 250 µm diameter | ||
| Measurement range | 0 – 50 % O2 0 – 500 hPa | 0 – 22.5 mg/L |
| Limit of detection | 0.03 % oxygen | 15 ppb |
| Resolution | ± 0.01 % O2 at 1 % O2 | ± 0.005 mg/L at 0.4mg/L ± 0.025 mg/L at 9.06 mg/L |
| Accuracy at + 20 °C* | ± 0.05 % O2 or ± 3 % rel. | |
| Measurement temperature range | from 0 to + 50 °C | |
| Response time (t90) | TF**: < 3 sec. (gas) | TF**: < 10 sec. (liquid) |
| Properties | ||
| Compatibility | Aqueous solutions, ethanol, methanol | |
| No cross-sensitivity | pH 1 – 14 | |
| Cross-sensitivity | Organic solvents, such as acetone, toluene, chloroform or methylene chloride | |
| Disinfection procedure | Disinfection with EtOH (70 % v/v) or isopropanol (100 % v/v) possible | |
| Cleaning procedure | Ethanol, soap solution, ddw | |
| Calibration | Two-point calibration with oxygen-free environment (nitrogen, sodium sulfite) and air-saturated environment | |
Related products
Resources
Publications
FAQs
Manuals
Oxygen Microsensors NTH / IMP / PM TF-250 (plastic fiber)
Oxygen Microsensors NTH / IMP / PM / FTCM (glass fiber)
Getting Started: Microx 4 & Microx 4 trace
Microx 4 & Microx 4 trace
Manual Micromanipulator MM
Automated Micromanipulator AM
User Guide: Automated Micromanipulator
PreSens Oxygen Calculator
Brochures
Software
PreSens Oxygen Calculator version 3.1.1 - Windows 7/8/10


