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Percent Paramagnetic Oxygen Analyzer
(rear view shown)
Pin out:
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
2.3
As mentioned previously, the selectivity of the measuring system is
based on the extraordinarily high magnetic susceptibility of Oxygen com-
pared to other gases. In most cases the presence of other gases can be ig-
nored but significant errors can occur when the sensor is calibrated with a
mixture of oxygen and nitrogen and the sample gas consists mainly of other
gases with considerable magnetic susceptibility. In this case, the reading
shows a measured value even if the sample gas contains no Oxygen. It is
actually displaying the cross sensitivity to another gas.
The following table shows the cross sensitivity of some gases when
changing from pure nitrogen to 100% of one of the gases listed.
Sensor
-15Vdc test pin (Not connected)
+15Vdc test pin (Not connected)
Measuring ground
Not used
Preamplifier output ~0- 1 Vdc
Not used
24 Vdc return, power ground
Collector of transistor switching heating element (Not con-
nected)
Fault signal: <0 Vdc= OK, >4.6 Vdc = Fault (Not connected)
Not used
Negative reference voltage (Not connected)
Positive reference voltage (Not connected)
Nominal temperature voltage signal (Not connected)
Actual temperature voltage signal (Not connected)
+24 Vdc power.
Cross Interference
Teledyne Analytical Instruments
Operational Theory 2
2-3
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