Dissolved Oxygen Knowledge Base Articles
What variables impact an oDO calibration?
Optical dissolved oxygen (oDO) sensors still require calibration, though less frequently than the polarographic versions. New sensors (or new caps on existing sensors) require a two point calibration in air and an air free environment, ideally high purity nitrogen.
Cross-Referencing VisiFerm Part Numbers
Please use the following table for referencing the Visiferm RS485 ECS part numbers against the Visiferm ECS and Arc part numbers. There is also a separate column present for an equivalent sensor with the new H3 or H4 cap design.
VisiFerm ECS Versus DO Arc Sensor Outputs
Hamilton offers two different interfaces for the VisiFerm optical DO sensors. Learn the differences between ECS and RS-485 sensors.
Optical Dissolved Oxygen Sensor Caps
There are several different options for optical dissolved oxygen (ODO) caps. This article provides recommendations for each product.
Optical Dissolved Oxygen Cap Cleaning
Best practices for care and maintenance of optical dissolved oxygen (ODO) sensor caps.
Cathode Replacement on Polarographic DO Sensors
This quick guide discusses how to replace the cathode on OxyFerm and OxyGold polarographic DO sensors.
Electrolyte & Membrane Replacement for Polarographic DO Sensors
This quick guide discusses how to replace the electrolyte and membrane on OxyFerm and OxyGold polarographic DO sensors.
VisiFerm DO Sensor Measurement Accuracy
This short article discusses the accuracy of optical oxygen sensors across their measurement range.
Optical Dissolved Oxygen Cap Quality
How do you know if the ODO cap on your sensor has degraded? This article gets into why these caps can degrade and how to assess them.
Comparing Optical To Polarographic Dissolved Oxygen Measurement
There is a clear trend in the market towards replacing polarographic with optical dissolved oxygen. When evaluating the switch to optical, engineers must consider if there will be any impact on the current process due to the change in measurement principle.
Changing Caps on Optical Dissolved Oxygen Sensors
Optical oxygen sensors such as the VisiFerm require periodic cap replacement to maintain proper measurement accuracy. This article discusses the procedure to do this.
Best Practices: Zero Point Oxygen Calibration
There are several methods to achieving a good zero point calibration of optical and polarographic DO sensors. This paper looks at each procedure in depth.
White Paper: Measurement Challenges with Optical Dissolved Oxygen Sensors
Measurement of dissolved oxygen is a critical control parameter for optimizing cell growth in bioprocesses. Download this whitepaper to learn how to optimize measurement accuracy and reduce common sources of process-related error.
Storage & Shelf Life - Polarographic Dissolved Oxygen Sensors
This brief article discusses the best practices for proper storage of polarographic sensors along with answering questions regarding shelf life.
After pH, oxygen is the most commonly measured parameter for Hamilton Process Analytics. We begin our series of topics on oxygen by exploring the very basics of this element.
Considerations for Oxygen Measurement
Our initial knowledge of oxygen comes from its behavior as a single gas component of the air in our atmosphere. This series of articles explores the composition of our atmosphere along with external factors such as the role pressure plays in determining the density of a single gas, oxygen, in our atmosphere.
Liquid Phase Oxygen Measurement
In our prior topic cluster we explored oxygen as a gas phase component in the atmosphere. This series of articles looks into dissolved oxygen in liquids (especially aqueous solutions). The topics of solubility and saturation will be explored.
Oxygen Measurement Principles
There are numerous sensor technologies to measure oxygen concentration. Two of the most common methods are polarographic and optical. This series of articles explores principles behind each method and finishes with a side-by-side comparison.
Calibration and Maintenance For Oxygen Sensors
Proper calibration and maintenance are critical for maintaining the best accuracy of the oxygen measurement. The articles below discuss some basic principles for proper care and maintenance of both polarographic and optical oxygen sensors.
DO Sensor Applications
Our prior topics dealt primarily with oxygen and the technology used to measure it accurately. This series of articles provides a brief look into some of the oxygen measurement applications in four different industries.