American Hospital Supply Corporation

Baxter International Inc.

Richard S Willing

Henrick K Gille

William G Bloom

Bernard Siegel

Richard Lobodzinski

Keith Gilroy

Tsang Cheung

A parameter measuring apparatus includes a constant signal circuit incorporating a sensor having a known response to a given parameter for outputting a signal representing the parameter. The constant signal circuit further includes circuitry defining upper and lower limits of the parameter range. The parameter signal is provided to a sampling device such as current-to-frequency converter for providing an analog-to-pulse converted signal to a microprocessor. The apparatus further includes a switching arrangement coupled to and controlled by the microprocessor for switching into circuit the sensor or the circuitry defining the upper or lower parameter limits. The switching arrangement also eliminates internal switch resistance in the circuit for improved measurement accuracy. With the known response of the sensor as well as known regression analysis correction calculations stored in the microprocessor, the microprocessor outputs a corrected parameter signal which accurately represents the measured parameter regardless of variation in circuit operation due to changes in operating conditions.

Parameter measuring apparatus

Diagnostic urinemeter unit

A liquid meter assembly for collecting, metering and monitoring liquid is disclosed. The assembly comprises a container for collecting the liquid, an electrically powered strain gauge suspension device for supporting the container and for determining the weight of the liquid collected in the container and a handle on the container for interconnecting with the strain gauge suspension device. A length of tubing is attached to the container and adapted for interconnecting with the source of the liquid. A tubing support system is included on the strain gauge suspension device for fixedly supporting the tubing to substantially inhibit influence on weight determination due to any movement thereon. A power supply is included in the assembly for supplying power to the strain gauge suspension device.

Liquid meter assembly

Growing community of inventors

Granada Hills, CA, United States of America

Richard S Willing