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VisiFerm is the first 12 mm optical dissolved oxygen sensor with integrated opto-electronics, having the full functionality of a measuring device with self-diagnostics. It is steam sterilizable, autoclavable and CIP compatible. VisiFerm DO requires less maintenance than a classical oxygen sensor as it does not have a mechanically sensitive membrane or a corrosive electrolyte.

Compare VisiFerm Versions

VIsiFerm ma dissolved oxygen sensor

2-Wire Analog or HART to PCS Connections

VisiFerm mA is the latest addition to the VisiFerm family and features a 2-wire design, HART communication, wireless communication via Bluetooth, and additional robustness for GMP production and explosive environments.

Digital Communication to PCS (Modbus or Analog) Connections

Looking for a more reliable signal? VisiFerm RS-485 sensors eliminate the need to amplify delicate nA signals by communicating directly to the control system digitally or via 4-20 mA.

Simulated Polarographic Signal Connections

VisiFerm ECS is an optical sensor for existing polarographic sensor installations. It simulates a traditional nA, electrochemical output making it easy to install with existing bio-controllers and transmitters.

Which VisiFerm is Best for My Application?

Sensor TypeTypical Connection StrategyPrimary OutputSecondary OutputOptional OutputWireless (Bluetooth)Temperature Compensation
VisiFerm mA 2-wire analog (or HART) to process control system; no transmitter required 4-20mA
(2 wire)
HART 7.0
(2 wire)
-- Integrated with sensor 4-20mA Compensated in sensor;
Temperature is HART variable
VisiFerm RS 485 Digital communication to process control system (Modbus or analog connection) Modbus RTU 4-20mA
(3 wire)
Profibus, Foundation Fieldbus, or 4-wire 4-20 mA with Wi adapter Optional with Wi Adapter 4-20mA compensated in sensor;
Temperature is Modbus variable
VisiFerm ECS Simulated polarographic signal to transmitter or conventional bioreactor controller nA
(ECS mode)
Modbus RTU 4-20mA
(3 wire)
in place of nA
Optional with Wi Adapter 4-20mA compensated in sensor;
NTC 22 kOhm when nA output is used

Dissolved Oxygen for Hygienic Applications

The VisiFerm DO is designing to meet the demanding needs of hygienic applications in the biotechnology, bio pharmaceutical, and food and beverage industry.

  • Standard 12 mm sensor shaft format
  • Autoclave, CIP, and SIP compatible
  • Electrolyte-free, eliminating contamination
  • Constructed from FDA compliant, and USP Class VI certified materials

Do you know all the potential sources of DO measurement error?

dissolved oxygen whitepaper

Much has been written about different strategies for proper DO control. However, little information has been publicly available regarding optimization of the actual measurement accuracy and reducing common sources of process-related error.

Get Hamilton's whitepaper on potential sources of optical dissolved oxygen measurement error and ways to mitigate the impact.

Get the White paper


Hamilton's knowledge base provides a range of explanatory articles, frequently asked questions, and document downloads.

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