1.Typical Lambda sensor range is between 0.2 to 1.8. How to measure higher lambda value more than 1.8 in experiments. i.e to measure very lean equivalence ratio? Can Brett schneider equation be used for low temperature combustion when the lambda value is more than 1.8. or brett schneider equation is valid only for lambda value closer to 1?
2. whether lambda sensor is available for different ranges with digital display and connection to ECU for control?
3. Fuel to be used diesel and gasoline.
Hi, ETAS LSU sensor spec Lambda λ: 0.6 to 16
You can connect sensor directly to ECU or buy the meter with sensor:
http://www.etas.com/en/products/es63x-technical_data.php
No problem with exhaust gases from any fuel.
Look for horiba MEXa sensor. I have worked with them. They must be having higher range of equivalence ratio.
In my experience, UEGO sensors can be calibrated out to the O2 concentration in air if necessary. If you are on a tight budget, you can use OE Bosch or NGK automotive sensors and a either a UEGO controller or DIY kit from:
http://www.wbo2.com/
We used the Horiba MEXA units (Bosch sensors if memory serves me) and also one-off instrumentation with NGK sensors. We typically calibrated UEGO sensors using a capillary gas divider and a mixture of 2.6% H2 - 6.6% CO - 10 % CO2 - balance N2 for calibrating rich and then chose an oxygen concentration for lean calibration based on the application. The rich calibration mixture gave us a rich-span value equivalent to approximately 0.81 lambda. For lean calibration, 4.7% O2 spanned at about 1.27 lambda (fine for most stoichiometric gasoline applications) and 9.7% O2 spanned at about 1.91 lambda (fine for many lean-burn applications) - just choose the oxygen concentration to span to the lean lambda value that you are looking for.
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