[Stoves] AFR Monitors or Air Fuel Ratio or LAMBDA readout .

[Frans Peeters]

Dear Frank and Crispin,

 

VW  has a 4 wire Lambda sensor Nr  0525  .

 

  

   BOSCH  LAMBDA sensors are  a few mm thick ZIRCONIUMOXYDE –CERAMIC
reaction time 100ms        350° C heater =13 ohm    20° C =3 ohm

   SIEMENS LAMBDA sensors are CeO2,SrTiO3, BaTiO3 on Al2O3    1um thick
reaction time  few ms .   1000 °C  and regulated to that !

If we call it AIR / FUEL ratio sensor,Frank ,it is beter to understand .

Suppose zero millivolt is only CO2 + N2

40 mV = 20 % O2      seems 2mV / % O2    Polarity  NEGATIVE

640 mV = 100 %  C7H16 seems 6,4 mV / % CxHy     POSITIVE

See it as a servo system  with the controller . Only the zero direction
regulaion or the cleanest motorconditions are of interests .

uProcessor with 250 K memory is programed this way,with all corrections .

 

HYPERLINK
"http://www.techedge.com.au/vehicle/wbo2/default.htm"www.techedge.com.au/veh
icle/wbo2/default.htm   sels low cost sensors and display.

 

Cheaper solution is calibration with 5 gas mixtures .

 

Leaded fuel can damage the sensor .

 

Greetings

Frans


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