Teledyne BDS-3960 - Oxygen analyzer - Manual (Page 21)

Oxygen Analyzer Operational Theory
Teledyne Analytical Instruments 21
While the 2nd working electrode allows OH
-
to move through, it
prevents the dissolved oxygen from the top portion of the sensor to reach
the sensing electrode. The reference electrode provides a potential
reference for both the sensing electrode and the 2nd working electrode.
NOTE: BDS technology and sensor is a patent pending
technology of Teledyne Analytical Instruments in the
United State of America as well as many foreign countries.
To learn more about BDS technology, please visit TAI’s web page at
http://www.Teledyne-AI.com
To learn more about potentiostat, visit Electochemical Society’s web
page at http://www.electrochem.org
2.2.2 Gas Flow Rate
The output from a BDS oxygen sensor is relatively insensitive to
change of gas flow rate if operated in the range of 1 - 3 SCFH (in
nitrogen). The output drops when the flow rate is below 1 SCFH. Figure
2.2 is a typical curve showing the sensor outputs at different flow rate.
Figure 2.2: BDS sensor output at different gas flow rate