ISM Dissolved Oxygen Sensors

Digital dissolved oxygen analyzers work based on the technology of the METTLER TOLEDO DO sensor selected. METTLER TOLEDO offers two digital DO sensor technologies: Amperometric and Optical.                                                                                  

Amperometric: These in-line dissolved oxygen sensors use a gas-permeable membrane to separate the sample from an electrochemical cell in the sensor. Oxygen diffuses through the membrane in direct proportion to the partial pressure of oxygen in the liquid outside the in-line DO sensor. A cathode and anode inside the probe are polarized with a voltage to enable the electrochemical reaction of oxygen. Oxygen is reduced at the cathode while the anode is oxidized, producing a small current in direct proportion to the amount of oxygen in the sample. In addition, the dissolved oxygen sensor uses the temperature value to convert the oxygen partial pressure signal to a dissolved oxygen concentration value by compensating for the changing solubility of oxygen with temperature. 

Optical: These in-line dissolved oxygen probes use optical technology for measurement. They contain an oxygen-sensitive layer that can fluoresce. This layer absorbs light from a light emitting diode in the sensor, and the light is released as fluorescence. The fluorescence lifetime depends on the amount of oxygen present in the sample medium.

ISM dissolved oxygen sensors store their own calibration data, so they can be quickly and accurately calibrated in any convenient location without having to adjust the transmitter. To increase productivity, ISM technology also provides accurate diagnostic tools to notify you when your sensor needs calibrated. Calibration processes vary based on the technology and type of sensor, but all digital dissolved oxygen sensors can be calibrated on-site by trained technicians.

METTLER TOLEDO has a wide range of in-line digital DO sensors, including

InPro 6850i digital amperometric dissolved oxygen sensors for sterile conditions                                                                             

InPro 6860i digital optical DO sensors suitable for hygienic environments

InPro 6900i/6950i amperometric DO probes for brewing

InPro 6900i optical digital DO sensors for brewing

Digital UPW DO Sensors suitable for semiconductor water and power plant cycle chemistry.