Selected Probes
Sensor Spots
Sensor spots (SP) are the most versatile version of non-invasive oxygen sensors. They are attached to the inner surface of any transparent vessel.
Examples are
- Cultivation bags
- Spinners
- Glass reactors
The transmitter with its optical fiber can be fixed opposite the sensor spot by using our accessories (see accessories brochure) which can be adapted for nearly all kinds of vessels.
Flow-Through Cell
The flow-through oxygen minisensor (FTC) is a miniaturized fiber chemical optical sensor integrated in a flow-through cell. It is connected to the transmitter by an optical fiber. A glass tube with an inner diameter of 2 mm is coated with an oxygen sensor at its inner wall. The volume for liquid inside the FTC is about 100 (±10) microliter. The standard flow cell can be easily connected via Luer-Lock adapters to external tubings.
The Smart Measurement Method
The light from the blue LED excites the sensor spot to emit fluorescence. If the sensor spot encounters an oxygen molecule, the excess energy is transferred in a non-radiative way, decreasing or quenching the fluorescence signal. The degree of quenching correlates to the partial pressure of oxygen in the matrix, which is in dynamic equilibrium with oxygen in the sample. The decay time measurement is internally referenced.
