Measuring electrical impedance of low conductivity samples to monitor microbial growth
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United States of America Patent
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-
Mar 26, 1991
Grant Date -
N/A
app pub date -
Dec 22, 1989
filing date -
Mar 8, 1988
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
Apparatus for measuring the electrical impedance of low conductivity samples, and particularly microbial suspensions, has a coil surrounding a tubular sample container. A capacitive pick-up on the sample wall provides an input to a variable gain amplifier driving the coil. The resident frequency of the circuit is measured to provide an indication of sample conductivity.
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