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- W2020178889 abstract "The speed of sound as a function of the average molecular weight in a gaseous mixture has been used to determine the concentration level of fuel vapor in air, in the range from 1.0% to 8.0% by volume. This method of measurement yields an error due to a 1°C change in temperature of only 0.18% and can be applied to many different types of fuel. The range can be extended to wider limits, but our interest included only the explosive region for gasoline fuel vapor, i.e., 1.6% to 7.8% by volume. Using this device, fuel vapor levels can be continuously monitored without altering the system in any way. Thus, error introduced by sampling, temperature change, and time delay are virtually eliminated. Sensitivity of the system to changes in fuel vapor levels is proportional to the ratio of the molecular weight of air. This method of measurement is applicable down to ratios of 1.51 and has been typically applied with a ratio of 3.9 with total success. Instrumentation has been developed to indicate fuel vapor levels by either meter movement or digital readout." @default.
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- W2020178889 date "1975-04-01" @default.
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- W2020178889 title "Acoustic fuel vapor monitor" @default.
- W2020178889 doi "https://doi.org/10.1121/1.1995373" @default.
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