Hamilton VisiFerm Optical DO Sensor

Especificaciones Generales
FAQs
Soporte Técnico

Dissolved oxygen is required for the survival and growth of many aquatic organisms, including fish. The concentration of dissolved oxygen may also be associated with corrosive and photosynthetic activity. The absence of oxygen may permit anaerobic decay of organic matter and the production of toxic and undesirable esthetic materials in the water. Main applications for this sensor are biotechnology, chemical industry, air surveillance, fish farming, water management and sewage water (gas and liquid phase).

The Visiferm utilizes luminescent technology and eliminates the typical drawbacks of membrane components. The measurement is unaffected by sample fouling or poisoning and virtually maintenance free with no membranes to replace, no electrolyte solution to replenish, no anode or cathode to clean or replace and long calibration intervals.

Features

suitable for steam sterilization, autoclavation and CIP
flow independant; self diagnostics
electrolyte-free so no leakages occur
no membrane so no concerns about air bubbles
no polarization time required
easily replacable sensor cap containing the sensing element
replacement sensor caps available
measurement not affected by sample color or turbidity
connector heads: VP 6 or Arc (VP 8)

The Visiferm sensor is coated with a luminescent material. Blue light from an LED is transmitted to the sensor surface. The blue light excites the luminescent material. As the material relaxes and falls back into its ground state, it emits red light.

The time from when the blue light was sent and the red light is emitted is measured. The more oxygen that is present the shorter the time it takes for the red light to be emitted. The time delay can be expressed as a phase shift between the wave patterns of the Blue LED light and the Fluoresced light. This phase shift is inversely proportional to the oxygen concentration in the fluid.