The Lumi 4 Optical Dissolved Oxygen (DO) probe incoporates an intelligent optical dissolved oxygen sensor. Utilizing the natural occurrence of fluorescence, the Lumi 4 produces fast and accurate measurement for all your dissolved oxygen and temperature needs.

Features and Benefits

• Fast response time
• Pressure and temperature independent
• Lifetime of red radiation and phase shift unaffected by wear - no need for intensive calibration with mishandling risks
• No oxygen consumption - no stirring or flow control needed
• Not affected by H2S or CO2 - also compatible with difficult applications
• No electrolyte - no risk of leakage or precipitation with no difficulty with servicing

Technology Overview
Fluorescence is a luminescence that is mostly found as an optical phenomenon in cold bodies, in which the molecular absorption of a photon triggers the emission of another photon with a longer wavelength. The energy difference between the absorbed and emitted photons ends up as molecular vibrations or heat. Usually the absorbed photon is in the ultraviolet range, and the emitted light is in the visible range.
Combined within the 12 mm shaft:

• High temperature capable optoelectronics
• 4-20 mA analog DO signal
• RS485 digital interface (ModBus RTU protocol)
• Industry standard PG 13.5 mechanical interface
• Steam sterilizable, autoclavable, CIP capable
• 8 ppb/0.1% to 300% of air saturation
• Maximum 130oC, 12 bar
• Response time = 30 sec (99.5%)
• Rugged sensor cap instead of a fragile membrane
• Electrolyte-free, no risk of leakage or precipitation