Teledyne Tablet Accessory T803 Manual De Usuario

Teledyne API T803 CO2/O2 Analyzer Operation Manual 

Principles of Operation 

This current is passed to a feedback loop, which generates a second current to a 
wire winding (in effect, a small DC electric motor) mounted on the suspended 
mirror. The more O

2

 present, the more the dumbbell and its attached mirror 

moves and the more current is needed to move the dumbbell back to it’s zero 
position. Finally, 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. 

 

12.2. CO

12.2.1. NDIR MEASUREMENT OF CO

The CO

2 

sensor is a silicon based Non-Dispersive Infrared (NDIR) sensor.  It uses 

a single-beam, dual wavelength measurement method. 

An infrared source at one end of the measurement chamber emits IR radiation 
into the sensor’s measurement chamber where light at the 4.3 μm wavelength is 
partially absorbed by any CO

2

 present.  A special light filter called a Fabry-Perot 

Interferometer (FPI) is electronically tuned so that only light at the absorption 
wavelength of CO2 is allowed to pass and be detected by the sensor’s IR detector. 

A reference measurement is made by electronically shifting the filter band pass 
wavelength so that no IR at the CO

2

 absorption wavelength is let through.   

 

The sensor computes the ratio between the reference signal and the measurement 
signal to determine the degree of light absorbed by CO

2

 present in the sensor 

07276B DCN6418