Measurement and quality
Practical explanations, observation points and project questions, from separation principles to maintenance and measurement.
Understanding residual oxygen in ppm and nitrogen purity in percent
A residual-oxygen result is not a complete composition analysis.
Selecting the range of a residual-oxygen analyser
Choose an instrument for the acceptance limit and the expected operating states.
Questions to ask about paramagnetic oxygen measurement
Assess the instrument against the actual sample and concentration range.
Why tiny sample leaks matter in trace-oxygen measurement
The sample reaching the sensor must represent the gas in the pipe.
How analyser response affects a quality interlock
Include transport, conditioning and instrument delay in the response discussion.
Choosing calibration gas for an oxygen analyser
Use a traceable reference suitable for the instrument and measuring range.
How online monitoring and laboratory analysis complement each other
Continuous visibility and detailed composition evidence answer different questions.
Why tubing and connections matter for low-dew-point measurement
Moisture interaction with the sample path can delay or distort a reading.
Avoiding confusion between Nm³/h and actual m³/h
A gas-volume rate needs a stated temperature, pressure and moisture basis.
Why a thermal flow meter needs review when the gas changes
Gas composition is part of the meter's calibration basis.
Why a result close to the limit needs an uncertainty discussion
A displayed value and a defensible acceptance decision are not identical.
Making gas-quality trends traceable
A useful record includes the context and status behind each value.
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