VisiFerm DO

VisiFerm is designed to meet the demanding needs of hygienic applications in the biotech, pharmaceutical, and food & beverage industry.


VisiPro is ideal for production with a simple 2-wire 4 - 20mA (HART) installation.


The VisiTrace optical oxygen sensor is specifically designed for low level dissolved oxygen down to ppb levels.


The VisiWater has a fixed cable making it ideal for submersible dissolved oxygen applications in the environmental water industry.

VisiFamily Sensor Features


Measuring Range (DO) 4 ppb - 25 ppm 0 - 2000 ppb 4 ppb - 25 ppm 4 ppb - 40 ppm
Measuring Principle Optical DO Optical DO Optical DO Optical DO
Process temperature -10 – 140 °C (no reading above 85 °C) -10 – 140 °C (no reading above 85 °C) -20 – 140 °C (no reading above 85 °C) 0 – 60 °C (no reading above 60 °C)
Pressure range -1 – 12 bar -1 – 12 bar -1 – 12 bar -1 – 12 bar
Hygienic aspects Autoclavable, CIP, SIP CIP, SIP CIP, SIP None
Sensor Ouptut nA, 4-20 mA, Modbus, Profibus*, FFB* 2 wire 4-20 mA 2 wire 4-20 mA (HART) 4-20 mA, Modbus, Profibus*, FFB*
Sensor Connector VP8 M12 - 4 M12 - 4 Fixed Cable
Surface Quality Ra < 0.4 μm (N5) Ra < 0.4 μm (N5) Ra < 0.4 μm (N5) Ra < 0.4 μm (N5)
Material Stainless steel 1.4435 Stainless steel 1.4435 Stainless steel 1.4435 Stainless steel 1.4435

* Profibus and Foundation Fieldbus (FFB) are achieved through a converter card.

Benefits of going with Optical Dissolved Oxygen

Optical dissolved oxygen sensors offer a significant improvement over traditional amperometric sensors commonly used in the demanding applications found in pharmaceutical, biotechnology, and beverage applications. Process related drift due to carbon dioxide and other acid gases is fully eliminated with optical technology. Maintenance and calibration intervals can also be extended as optical sensors do not require electrolyte or internal cathode/anode replacement. Finally, optical sensors have no polarization time thus can accurately measure oxygen immediately upon power up.

  • Insensitive to CO2 fouling
  • Eliminates polarization
  • Simplifies maintenance with a single replacement part
  • No electrolyte to contaminate the process
  • Quicker response time
  • Measurement is independent of flow
  • Stable against pressure spikes
  • Can be installed inverted
  • Insensitive to poisoners like H2S and Ammonia

How does optical dissolved oxygen work?

The sensing element for an optical DO sensor is an oxygen sensitive luminphore. A blue light from the sensor excites the luminiphore. When the excited molecule returns to its ground state it gives off red light. In the presence of oxygen some of the energy is transferred to the oxygen molecule. The oxygen measurement is made by comparing the excitation light (blue) to the emitted light (red).

Optical sensors are insensitive to CO2 fouling?

Over long fermentation runs, sensors are exposed to CO2 gas used for pH control or resulting from cellular respiration. The gas travels through the membrane of a polarographic sensor and changes the pH of the electrolyte. This change results in a lower nA reading.

The power of Arc connectivity

All optical sensors are compatible with ArcAir software. Connect wired or wireless to PC's, tablets, and mobile devices.

  • Simplify troubleshooting
  • Automatic documentation
  • Enhanced user security


Specific Applications


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