Dissolved Oxygen Knowledge Base Articles

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.

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.

Hamilton offers two different interfaces for the VisiFerm optical DO sensors. Learn the differences between ECS and RS-485 sensors.

There are several different options for optical dissolved oxygen (ODO) caps. This article provides recommendations for each product.

Best practices for care and maintenance of optical dissolved oxygen (ODO) sensor caps.

This quick guide discusses how to replace the cathode on OxyFerm and OxyGold polarographic DO sensors.

This quick guide discusses how to replace the electrolyte and membrane on OxyFerm and OxyGold polarographic DO sensors.

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

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.

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.

Optical oxygen sensors such as the VisiFerm require periodic cap replacement to maintain proper measurement accuracy. This article discusses the procedure to do this.

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.

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.

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.

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.

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.

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.

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.

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.