Microsensors

The oxygen microsensors from PyroScience feature a small tip of only 50 – 70 µm which enables fast and precise measurements in small samples with high spatial resolution. Our fibre-optic oxygen sensors feature no oxygen consumption, no stirring sensitivity, an extremely long shelf time, resistance to corrosive environments (e.g. seawater) and are suitable for multiple applications in gas, water and aqueous samples.

Common application areas are:

• Measurements in low/small volumes
• Microprofiling e.g., in sediments, biofilms or 3D cell cultures
• Measurement in plant tissues
• Aquatic Eddy Covariance measurement

Microsensors can be used with our multi-channel PC-operated FireSting-O2, the multi-analyte meter FireSting-PRO (also in combination with our optical pH sensors), or stand-alone with our pocket oxygen meter FireSting-GO2. Furthermore, underwater SUB connectors allow to connect the sensors to our AquaPHOX devices for measurements under water even in the deep sea (down to 4000m).

Applicable Oxygen Sensor Types

Fixed Fibre Sensor (OXF50): The fragile sensor tip protrudes ca. 6mm from a straight-cut needle. The sensor can be applied in liquids and in gases. This sensor type is best suited for application in media with high salt content (e.g. seawater) and can be used for micro profiling of biofilms.

Retractable Needle-Type Sensor (OXR50): The fragile sensor tip is surrounded by a 40 mm long syringe needle. The sensor tip can be extended from the needle for sensor calibration and measurements. Therefore, the sensor tip is protected during handling of the sensor like for example insertion into measuring set-ups. Once fixed in the set-up, e.g. for microprofiling the sensor tip can be extended from the protecting needle (for up to 12mm) allowing measurements and profiling applications at high spatial and temporal resolution.

Bare Fibre Sensor (OXB50): This sensor is based on the same fiber as the other needle-type microsensors, but it comes without sensor housing. The bare fibre sensors are flexible and enable, e.g. integration into customized housings with complex geometries or implantation into sediments, soils or plant tissue.

Applicable Oxygen Sensor Options and Accessories

• High speed (-HS) (<0.8s response time) and Ultra-high speed (-UHS) (<0.3s response time) for very fast measurements (e.g. aquatic Eddy covariance measurements)
• Optical isolation (-OI) for measurements with high illumination (e.g. photosynthesis measurements)
• SUB connector(-SUB) for measurements under water using an APHOX device
• Microprofiling set-ups (MU1, MM33, MUX2, HS1, LS1) (e.g. profiling of sediments, biofilms or cell cultures)

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