1.8
Figure 1.3 Oxygen Measuring CellFigure 1.2 Dumb-Bell
System
1.5 SPECIFICATION
See Appendix 8 for specification.
1.6 FUNCTIONAL DESCRIPTION AND OPERATION
1.6.1 Transducer Unit
The Transducer unit can be divided into three basic functional units:
1. Measuring Cell
2. Heaters and Temperature Sensor
3. Pressure Compensation (Optional)
1.6.1.1 Measuring cell
The 1100A oxygen analyser measures the paramagnetic susceptibility of the sample gas by
means of a magneto- dynamic type measuring cell.
The paramagnetic susceptibility of oxygen is significantly greater than that of other common
gases. This means that oxygen molecules are attracted much more strongly by a magnetic
field than are molecules of other gases, most of which are diamagnetic (repelled by a magnetic
field). Magneto-dynamic oxygen analysers are based upon Faraday's method of determining
the magnetic susceptibility of a gas by measuring the force developed by a strong non-uniform
magnetic field on a diamagnetic test body suspended in the sample gas.
The test body of all measuring cells in Servomex paramagnetic oxygen analysers consists of
two nitrogen filled Pyrex glass spheres arranged in the form of a dumb-bell as shown by Figure
1.2.
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