Features

• Easy to handle
• Usable for process application
• Limit of detection: 0.15 % air-saturation, 15 ppb dissolved oxygen
• Measuring range: 0 - 100 % oxygen, 0 - 45 mg/L
• Very robust sensor with excellent long-term stability
• Sterilizable by H2O2, ethanol, gamma irradiation, EtO2
• No self-consumption of oxygen
• Signal independent on flow velocity
• Insensible towards electrical interference and magnetic fields
• Dry gases applicable
• Robust sensor body

This dipping probe oxygen mini sensor, consists of a polymer optical fiber (POF) with a polished distal tip which is coated with a planar 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.

Features

• Easy to handle
• Very robust sensor
• Excellent long-term stability
• No self-consumption of oxygen
• Signal independent on flow velocity
• Insensible towards electrical interferences
• Measures oxygen in liquids as well as in gas phase

This flow-through oxygen mini sensor requires a fiber cable with bare tip for use with Witrox 1 and Witrox 4 instruments. The re-usable (non-disposable) oxygen sensor has excellent long-term stability. Clean it with ethanol or even ETO, recalibrate, and use it again and again.

Features

• Excellent long-term stability
• Easy to handle and robust
• Non-invasive and non-destructive measurement from outside through the wall of the flask
• Usable for process application
• No self-consumption of oxygen
• Signal independent on flow velocity
• Insensible towards electrical interferences and magnetic fields
• Measures oxygen in liquids as well as in gas phase
• Excellent mechanical stability and long-term stability
• Online monitoring

Sensor spots are thin planar oxygen mini sensors immobilized onto either polyester or glass supports, for use with our Witrox instrument (i.e., not compatible with microplate readers!).

The sensor spots are glued inside chambers, flasks or disposables with translucent and non-fluorescent walls (e.g. glass, polyester, acrylic etc.). Then oxygen measurements can be done in a non-invasive and non-destructive way from outside and through the wall of your vessel.

With silicone glue you can glue the sensor spots inside your own chambers, flasks, disposables, or we can do it for you.

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 is fixed with a special chamber (holder), or run through a Radiometer/Cameron dummy electrode adapter for fiber optic oxygen sensing in Radiometer/Cameron electrode chambers, cuvettes etc.

2) A fiber cable with a threaded SMA connector at the tip is screwed onto a fitting sitting on a velcro band adapter for curved chamber walls or planar walls.

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. 80-1700 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.

Features

• Galvanic cell giving a 0-25 mV output (no power supply needed)
• Build-in temperature compensation
• Excellent long-term stability
• Tough membrane can be wiped clean with a cloth
• Probe does not need regular service or renovation

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.