This small but rugged and very stable galvanic cell oxygen probe is designed for fish respirometry and other laboratory applications. It can even be used for atmospheric measurements, e.g. for air breathing animal respirometry.
This fixed needle type micro oxygen sensor (NFS) is designed for all research applications where a small tip size from 50 µm to 140 µm or a fast response time (typ. 1 sec) are required, e.g. micro profiling in sediments/biofilms or invasive work.
The oxygen-sensitive tip of an optical fiber is fixed inside a stainless steel needle and comes in two different versions: 1) for measurements in gas phase (order code: NFSG); and 2) for measurements in liquid phase (order code: NFSL).
This sensor design makes it easy to penetrate through a rubber septum rubber, a blister package or any other harsh material.
Fiber cables with a length up to 10 m and an outer diameter of 0.9 mm are available. If you need a more robust cable (o.d. 3.1 mm) or a cable length of more than 10 m (maximum 60 m), please contact us.
This oxygen sensor consists of a polymer optical fiber (POF) with a polished distal tip which is coated with a planar trace oxygen-sensitive foil.
The end of the polymer optical fiber is covered with a high-grade steel tube, to protect both the sensor material and the POF.
The cable has an outer diameter of 2.8 mm. The inner diameter of the POF is 2.0 mm. The steel tube has an outer diameter of 4 mm.
Usually, the fiber is coated with an optical isolated sensor material in order to exclude ambient light from the fiber tip and to increase chemical resistance especially against oily samples as well as to reduce bio-fouling on the sensor membrane. This type of oxygen sensor has an excellent long-term stability.
The Flow-through oxygen mini-sensor (FTC-PSt6) is a miniaturized fiber optic chemical sensor integrated in a T-shape flow through cell.
The flow-through cell is connected to the oxygen meter Fibox Trace by a polymer optical fiber (POF) with 2 mm diameter as a light guide. A glass tube with 2mm inner diameter (4mm outer diameter) is coated with oxygen sensor at its inner wall. The volume for liquid inside the FTC cell is about 100 (±10) microliter.
The standard T-shape flow cell can be easily connected via Luer-Lock adapters to external tubings. Liquids (like water, blood, etc.) can be pumped through the cell. This type of oxygen sensor has an excellent long-term stability.
These autoclavable mini oxygen sensor spots come glued onto a rigid glass support, and can thus be used on planar surfaces only.
Use them with chambers/vessels with planar translucent and non-fluorescent walls (e.g. glass, polyester, acrylic etc.). In this way oxygen measurements can be done in a non-invasive and non-destructive way, and the sensor can be sterilized together with the chamber/vessels through autoclavation and without harming the sensor.
To use the sensor spots a fiber optic instrument and an external fiber cable (light guide) is required. The tip of the fiber cable delivers (blue) light to the backside of the sensor spot though the wall (and transparent glue). The front side of the sensor spot is in contact with the media (liquid or gas), e.g. the light is not passing through the media.
There are two ways of fixing the (external) fiber cable over the centre of the (internal) sensor spot:
1) A bare tip fiber cable (OX11150) is used with a special holder to keep it in a fixed position over the spot.
2) A fiber cable with a threaded SMA connector at the tip (OX11160) is screwed onto an SMA adapter (OX11180) that is glued onto the planar wall of your chamber/vessel.
These oxygen sensor spots are compatible with the microplate reader and can be used as replacements for any damaged or bleached spots in your Loligo® glass microplates ( vol. 200-1700 µl). Please visit our FAQ for instructions on how to mount spots. The sensor spots come pre-calibrated, but the microplate reader software also offer a 1-point and 2-point calibration option.
A black optical isolation layer shields the oxygen sensitive dye, so this sensor can be used in ambient light or even at illumination, e. g. for photosynthesis applications. The sensor spot can be cleaned with ethanol and is therefore reusable.