Real-Time to Disk and Real-Time Plot to Disk Specifications
Sample Selection: Both AFRs are stored. If an AFR sensor is not used, its limit value is
stored.
Sample Size: 100 to 100,000 measurements for each AFR sensor.
Sample Interval: 0.1 to 60 seconds.
Input Specifications and Limits
Air-to-Fuel Ratio:
• Measurement Range, Response Time, Accuracy: See the section entitled
Measurements and Accuracy on page 33.
• AFR measurement calibration information is provided in the sections entitled
AFR Measurement Calibration ("AIR CAL") on page 22 and Unit-Specific
Information on page 43.
• Fuel Composition:
H:C ratio range: 0.00 - 10.00
O:C ratio range: 0.00 - 10.00
N:C ratio range: 0.00 - 1.00
gasoline (1.70 < H:C < 2.10, O:C=0.0, N:C=0.0)
(1.75 or 1.85 are commonly used)
methanol (H:C=4.0, O:C=1.0, N:C=0.0)
ethanol (H:C=3.0, O:C=0.5, N:C=0.0)
propane (H:C=2.67, O:C=0.0, N:C=0.0)
methane (H:C=4.0, O:C=0.0, N:C=0.0)
Do not use the AFR sensors with leaded fuel or in a heavily sooting or crankcase
oil burning engine because these conditions will severely shorten the life of the
sensors.
• Maximum allowable levels of fuel "impurities":
Lead: 0.012 gm/gal.
Phosphorous: 0.0008 gm/gal.
Sulfur: 0.035 % by weight
• Exhaust Gas Temperature Range: 0 - 850 deg. C, 32 - 1562 deg. F.
● Maximum Exhaust Temperature: 950 deg. C, 1742 deg. F.
● Maximum Rate of Temperature Change: 50 deg. C/sec, 122 deg. F/sec.
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