Abstract: A temperature controlled gravimetric moisture analyzer (20) is used to control the temperature of a sample material (24) while determining moisture content of the sample material (24). The moisture analyzer (20) includes a thermally conductive sample holder (22) having an emissive surface (44). A high precision force balance (30) is coupled to the sample holder (22) for weighing the sample material (24). A heater (26) encloses the sample material. An air temperature sensor (38) is configured to produce an air temperature signal (54). An infrared temperature sensor is configured to detect infrared emissions from the emissive surface (44) to produce a sample temperature signal (60) representative of the temperature of the sample material (24). A controller receives the air and sample temperature signals (54, 60) and controls the heater (26) in response to the signals.

Abstract: Ultrasonic apparatus determines the fluid depth, volume, and temperature in a storage tank. A system description for monitoring an underground storage tank containing gasoline is described. The system determines the water's and gasoline's depth, volume, and temperature. The apparatus consists of a remote console, ultrasonic probe, and interconnecting cable. The remote console contains a display to report tank information and a computer to operate the probe. The probe consists of an ultrasonic transducer above the bottom of the probe facing upwards to transmit and receive ultrasonic signals, vertically spaced reflectors and a temperature sensor to measure fluid temperature.

Abstract: Ultrasonic apparatus determines the fluid depth, volume, and temperature in a storage tank. A system description for monitoring an underground storage tank containing gasoline is described. The system determines the water's and gasoline's depth, volume, and temperature. The apparatus consists of a remote console, ultrasonic probe, and interconnecting cable. The remote console contains a display to report tank information and a computer to operate the probe. The probe consists of an ultrasonic transducer above the bottom of the probe facing upwards to transmit and receive ultrasonic signals, vertically spaced reflectors and a temperature sensor to measure fluid temperature.

Abstract: A gas sensor for detecting the presence of a specified gas within a mixture includes a silicon substrate, a silicon nitride membrane supported by the substrate, a thin gold sensor trace deposited on the membrane, and a thin gold reference trace deposited on the membrane. A molybdenum adhesion layer is employed between the membrane and the gold traces. The electrical resistance of the sensor trace changes when the sensor trace adsorbs molecules of the gas. Solid state construction facilitates quick and efficient regeneration of the sensing capability of the gas sensor. The silicon nitride membrane and the molybdenum adhesion layer do not adversely affect the resistivity of the gold traces. An alternate gas sensor embodiment includes an integrally formed heater element.

Abstract: Apparatus for determining the actual and proportional amounts of a volatile fluid in a test staple is described. The test staple is stored in a sealed container after being collected and kept in the sealed container through testing. The volatile fluid of interest is evolved from the test sample and a carrier gas transports the volatile fluid past a sensor. The sensor determined the relative amount of the volatile fluid of interest in the carrier gas. The flow rate of the carrier gas is precisely known and is predetermined. A microcomputer is utilized to predict with great accuracy the actual and proportional amount of the volatile fluid in the test sample.

Abstract: A circuit for use with an ultrasonic transducer utilized to measure depths of liquids in tanks is described.

Abstract: The apparatus determines the content by weight of a volatile fluid, such as water, in a sample under test where the volatile fluid is typically less than one-half percent by weight by heating the sample in a sealed chamber to evaporate the volatile fluid under test. The evaporated fluid is passed through a collector which senses and collects only the evaporated volatile fluid of interest which collection correspondingly increases the weight of the collector. Measuring the weight change of the collector and comparing it with the initial weight of the test sample provides a determination of the percent of the sensed volatile fluid in the test sample.