VisiFerm mA

The VisiFerm mA is the next generation optical dissolved oxygen (DO) sensor designed for use in explosive environments. Available in multiple sensor lengths and with different sensor caps. 

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  • Dissolved Oxygen Sensor VisiFerm mA

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VisiFerm mA Details

Precise DO Measurement, Less Frequent Calibration. The VisiFerm mA is the next-generation optical dissolved oxygen (DO) sensor designed for explosive environments. This 2-wire sensor features 4-20 mA and digital HART outputs for seamless integration into production processes. Now carrying full CSA certification alongside existing ATEX and IECEx approvals, the VisiFerm mA offers a truly global solution. It meets all CSA, UL, and FM requirements for intrinsically safe process control in hazardous locations across North America (Class I, II, and III).

 

The VisiFerm optical technology improves the measuring performance and simplifies maintenance. Improvements compared to conventional electrochemical (amperometric) sensors include flow independence, rapid startup with no polarization time, and no nA noise. It requires less maintenance than an amperometric oxygen sensor as it does not have a mechanically sensitive membrane or a corrosive electrolyte. The VisiFerm mA mitigates the negative effects of aging, temperature, and photobleaching to reduce the frequency of calibration and deviation reports.

Common applications Pharma & Biopharma, Bioprocess Upstream, Water, Energy, & Environment, Water and Wastewater, Power Generation

ATEX, UKEx and IECEx certified, with CSA approval for North American hazardous locations (Class I, II, III)

Reduce maintenance with a durable, membrane-free optical design.

Improve accuracy and stability with flow-independent measurement.

DO Measurement

Accurately measures dissolved oxygen quality assurance during filtration and filling.

4-20 mA Output for Seamless Integration

Transmits real-time data directly to your process control system for improved efficiency.

Scientific Citations

  • We particularly appreciated the professional and personable approach.

    The training on pH sensors was highly beneficial for us. After a detailed introduction to the fundamentals of pH measurement, electrode measurement principles, and the topic of troubleshooting/prevention, we had sufficient time to ask our specific questions. This enabled us to apply what we learned immediately and integrate it directly into our laboratory routine. We particularly appreciated the professional and personable approach of Mrs. Näf-Rüdiger, who guided us through the informative and application-oriented training session.

    Romy Alisch
    Scientist, Novozymes Berlin GmbH, Germany

  • I could not be more pleased with my experience with Hamilton!

    My company has been using Hamilton probes for years and have always been happy with their performance! The team is always very helpful in trouble shooting issues and answering any questions that we may have about our probes. Overall, I could not be more pleased with my experience with Hamilton!

    Abigail Mann
    Bioprocessing Fermentation Associate at Heliae Development

  • The sensors allowed us to improve the end product.

    We have high quality standards and are convinced that Hamilton is able to meet them with its oxygen sensors. We use the oxygen sensors throughout the entire area of ​​beer production and bottling. The sensors allowed us to improve the end product. Hamilton's support is excellent at all times.

    Marco Punke
    Team leader for technology and QM/UM, Princely Fürstenbergische Brewery GmbH & Co. KG

VisiFerm mA Specifications

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Process Connection PG13,5
Sensor Family VisiFerm mA
Wetted Parts Stainless Steel 1.4435
EPDM (Ethylene propylene elastomer)
Electrical Connector M12
Measuring Range 4 ppb to 25 ppm (in liquid)
100 ppm to 600'000 ppm (in gas)
0.01 - 62.85 %-vol or 0.05 to 300 %-sat
0.1 to 625 mbar (pO2)
At 25°C and 1013 mbar total gas pressure
Electrolyte None
Accuracy at 25 °C 1 ± 0.05 %-vol; 21 ± 0.2 %-vol; 50 ± 0.5 %-vol
Drift at Room Temperature < 1 % per week
Oxygen Consumption None
Temperature Sensor NTC 22 kOhm
Configurable Values Dissolved oxygen (DO): mbar, %-sat, %-vol, μg/l ppb, mg/l ppm, ppm gas; Temperature: °C, °F, K
Surface Quality of Steel Ra < 0.4 µm (N5)
4 to 20 mA Current Range 3.5 to 22 mA
Analog Interface 1 Two wire sink 4 to 20 mA for DO, programmable
4 to 20 mA Accuracy < 0.3 % current value + 0.05 mA
Transmitting Power Max. 4 dBm
Digital Interface Bluetooth 5.0
HART Protocol 7
Operating Voltage 18 to 30 VDC
Serial Number Yes
Response Time t98% < 30 s at 25 °C
Certificate Yes, with measured current in air
ATEX Approval ll 1 G Ex ia llC T3/T4/T5/T6 Ga; II 1 D Ex ia IIIC T135°C Da
IECEx Approval ll 1 G Ex ia llC T3/T4/T5/T6 Ga; II 1 D Ex ia IIIC T135°C Da
Diameter 12 mm
Autoclavable Yes
Steam Sterilizable Yes, max. Temperature 140 °C
CIP Yes
Operating Temperature Range -20 to 140 °C; the sensor provides no DO reading above 85 °C
Pressure Range bar g -1 to 12 bar
Protection Rating IP68
Required Flow None

Compatibility with Hamilton Devices

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VisiFerm mA Resources

Browse app notes, user guides, specification documents, and more in our Knowledge Center.

Browse app notes, user guides, specification documents, and more in our Knowledge Center.

Browse app notes, user guides, specification documents, and more in our Knowledge Center.

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Arc Sensors - Signal Averaging

Certain applications may introduce conditions that create fluctuating or "noisy" measurements. The noisy measurement can make process control challenging. One way to improve signal stability is to adjust the moving average setting using ArcAir software.
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Article

VisiFerm DO Sensor Measurement Accuracy

This short article discusses the accuracy of optical oxygen sensors across their measurement range.
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Article

Glossary of Sensor & Biopharma Acronyms & Abbreviations

Acronyms and abbreviations are commonly used with process analytics measurements found in the biopharma industry. This glossary is an attempt to de-code some of the more frequently used acronyms.

Browse app notes, user guides, specification documents, and more in our Knowledge Center.

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FAQ

What is the accuracy of my Visiferm DO Sensor?

The Visiferm DO has accuracy specifications based upon the range of oxygen being measured. Click to see the Knowledgebase article for more information.
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FAQ

Do optical DO sensors require flow to measure accurately?

No, optical dissolved oxygen sensors will measure accurately without the need for flow. This is a key difference between optical and polarographic measurement technology. Polarographic sensors consume oxygen as part of their electrochemical reaction thus should have constant flow moving past the sensor to maintain accurate readings.
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FAQ

Does my optical DO sensor require calibration prior to usage?

All Hamilton optical dissolved oxygen sensors come with factory calibration; however, for best accuracy, it is recommended that calibration is performed prior to use. The factory calibration does not account for variations in atmospheric pressure or humidity which are often different based on location.
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Application and Technical Support

Hamilton's Technical Support team is here to provide product trouble-shooting, repair, application support, virtual start-up support, and more.

Installation Support

Installation, set-up, and calibration support directly on-site. Our field service team ensures your sensors and cables are installed and functioning correctly.

Qualification IQ/OQ

Support for the qualification of Hamilton equipment including complete documentation. Readying your process for GMP manufacturing activities.

On-Site Training

User trainings and on-site trainings for technicians. Tailored training ranging from basic operation to advanced calibration and maintenance.

On-Site Service Diagnostics

Diagnosing and resolution of process system problems on-site. Finding the root cause and presenting a solution to fit your needs.

Maintenance and Calibration Services

Preventative maintenance and regular service contracts. Schedule on-site service dates to ensure your sensors are properly maintained and your process is optimized.

Modular Service Contracts

Hamilton offers modular service contracts tailored to your requirements, featuring a basic module complemented by optional add-ons.

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