Fluid level and humidity and Measuring2 Guide - Electronics and Review

Piezo crystal monitors liquid level

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Signal conditioning precisely indicates humidity

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Analog Devices

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Low-cost relative-humidity transmitter uses single logic IC

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Hot Water Tank Indicator

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Measure humidity and temperature on one TTL line

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Fluid Level Sensor

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Water-Level Sensor Uses Hysteresis

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Circuit checks swamp-cooler water level

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Humirel

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Sonarlike method detects fluid level

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RF/Capacitance Level Instrumentation

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Moisture Alarm

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Water Level Indicator With Alarm

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Capacitance type liquid level monitor

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Capacitance type liquid level monitor

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One-wire bus powers water-level sensor

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Transmitter senses triple relative-humidity figures

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Nb = 18