01 / Practical selection
Separate visible bubbles from dissolved oxygen
A liquid can contain visible entrained bubbles and dissolved gas. An observation of fewer bubbles does not by itself establish a dissolved-oxygen result.
Describe the problem you see and give any measured values with units. If oxygen measurements are unavailable, say so and identify the process or quality observation driving the enquiry.
02 / Practical selection
Specify where the target must hold
Name whether the acceptance point is at the deaerator outlet, after heating, at a buffer or before filling. Include the transfer path between the machine and that point.
Air introduced after the vessel can change a downstream measurement. The test boundary should reflect the part of the process that matters to the buyer.
03 / Practical selection
Make the comparison repeatable
Use a documented sampling method and record product temperature, operating flow and recipe. Identify the instrument and how samples are protected from air exposure during measurement.
Agree inlet and outlet measurements and the operating conditions with the proposed configuration. The resulting target should be a project-specific acceptance condition, not an unqualified claim borrowed from another application.
Common questions
Oxygen target & testing questions
Can you promise a universal outlet oxygen value?
An agreed result depends on the product and operating boundary. The actual target and test conditions should be defined in the project specification.
Why measure after the deaerator as well?
The transfer path can add air again. The downstream point confirms whether the process objective is protected through the relevant line section.