Teledyne 360E Benutzerhandbuch

The oxygen sensor used in the M360E analyzer utilizes the fact that oxygen is attracted into strong magnetic 
field; most other gases are not, to obtain fast, accurate oxygen measurements.   

The sensor’s core is made up of two nitrogen filled glass spheres, which are mounted on a rotating suspension 
within a magnetic field (Figure 5-7).  A mirror is mounted centrally on the suspension and light is shone onto the 
mirror that reflects the light onto a pair of photocells.  The signal generated by the photocells is passed to a 
feedback loop, which outputs a current to a wire winding (in effect, a small DC electric motor) mounted on the 
suspended mirror. 

Oxygen from the sample stream is attracted into the magnetic field displacing the nitrogen filled spheres and 
causing the suspended mirror to rotate.  This changes the amount of light reflected onto the photocells and 
therefore the output levels of the photocells.  The feedback loop increases the amount of current fed into the 
winding in order to move the mirror back into its original position.  The more O

2

 present, the more the mirror 

moves and the more current is fed into the winding by the feedback control loop. 

A sensor measures the amount of current generated by the feedback control loop which is directly proportional 
to the concentration of oxygen within the sample gas mixture (see Figure 5-7). 

 

The oxygen sensor option is transparently integrated into the core analyzer operation.  All functions can be 
viewed or accessed through the front panel, just like the functions for CO

2

   

 The 

O

2

 concentration is displayed in the upper right-hand corner, alternating with CO

2

 concentration.   

  Test functions for O

2

 slope and offset are viewable from the front panel along with the analyzer’s other 

test functions. 

  O

2

 sensor calibration is performed via the front panel CAL function and is performed in a nearly identical 

manner as the standard CO

2

 calibration.  See Section 3.3.1 for more details. 

  Stability of the O

2

 sensor can be viewed via the front panel (see Section 3.3.2.1).   

  A signal representing the currently measured O

2

 concentration is available.