Percent Paramagnetic Oxygen Analyzer

Operational Theory 1

 

 

 

 

 

 

 

 

 

Sensor

(rear view shown)

Pin out:

1-15Vdc test pin (Not connected)

2+15Vdc test pin (Not connected)

3Measuring ground

4Not used

5Preamplifier output ~0- 1 Vdc

6Not used

724 Vdc return, power ground

8Collector of transistor switching heating element (Not con- nected)

9Fault signal: <0 Vdc= OK, >4.6 Vdc = Fault (Not connected)

10Not used

11Negative reference voltage (Not connected)

12Positive reference voltage (Not connected)

13Nominal temperature voltage signal (Not connected)

14Actual temperature voltage signal (Not connected)

15+24 Vdc power.

1.3Cross Interference

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.

Teledyne Analytical Instruments

Part II: 1-3

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Teledyne 3010MB operating instructions Cross Interference, Sensor Rear view shown

3010MB specifications

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