The SE740 optical oxygen sensor is low maintenance and has a smooth polished finish which makes it the ideal sensor for standard industrial and hygienic applications. In addition, the digital sensor is designed to have no effect from process flow. This is a low-maintenance optical oxygen sensor.  Simply replace the sensor cap.  There is no requirement for the replacement of electrolyte or for polarization.  Maintenance downtime is significantly reduced when compared to amperometric style sensors.  This oxygen sensor has a surface finish of <0.4 µm and uses a Silicon (FDA and USP tested) membrane which allows it to meet FDA requirements.