ES magazine Issue 41 Reliable solutions for industrial gas applications | Page 15

TECHNOLOGY FOCUS

SENSITIVE , NON-DEPLETING OXYGEN MEASUREMENTS

Servomex ’ s Coulometric technology enables the measurement of oxygen ( O 2 ) at parts-per-million ( ppm ) and parts-per-billion ( ppb ) levels . It is non-depleting , so there is no requirement for periodic cell replacement , and it avoids the false low readings associated with standard electrochemical sensors .
The sensor operates through a simple Coulometric process where O 2 from the sample gas is reduced to hydroxyl ions at the sensor cathode .
The resulting current flow is proportional to the O 2 content in the gas , and the process signal is displayed in ppm units of O 2 .
Coulometric sensors respond very quickly to changing O 2 concentrations . This is highly beneficial for users who have upset-prone applications .
Additionally , the performance of the sensor is unaffected by reasonable changes in flow rate .
Because the non-depleting sensor is not consumed when exposed to O 2 , it has a long lifespan and does not require a purge gas to protect it when not in use .
HUMMINGBIRD COULOMETRIC SENSOR
KEY APPLICATIONS
Semiconductors Solder reflow ovens Reactor process control
KEY BENEFITS
Industry-leading lower detection limits
Fast response and rapid recovery
Non-depleting sensor – long lifespan
No sensor zero calibration required
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