Fluid status detector

• US 4,835,521 A
• Filed: 11/05/1987
• Issued: 05/30/1989
• Est. Priority Date: 11/05/1987
• Status: Expired due to Fees

• Current Assignee: Emerson Electric Company
• Original Assignee: Emhart Industries, Inc. (Stanley Black & Decker, Inc.)
• Inventors: Clarkson, Bruce A., Slocum, Laurence S., Andrejasich, Raymond J.
• Primary Examiner(s): Levy, Stewart J.
• Assistant Examiner(s): ROSKOS, JOSEPH
• Application Number:
  US07/116,787
• Time in Patent Office: 572 Days
• Field of Search: 340/521, 340/605, 340/522, 73/61.1 R, 73/291, 73/292, 73/49.2 T
• US Class Current: 340/521
• CPC Class Codes: G01M 3/16 using electric detection means G01M3/045, G01M3/06, G01M3/12, G01M3/20, G01M3/24, G01M3/26 take precedence

Abstract

There is a controller connected to a plurality of probes via a transmission line. The controller provides a command signal including a probe identifier signal and a probe data signal. Each probe includes a plurality of different sensors, each providing one or more status signals on a plurality of probe data channels. Each probe also includes a comparator for comparing the probe identifier signal to a local probe address, a multiplexer responsive to the data signal for selecting one of the data channels, and a switch responsive to the comparator to provide the selected data signal to the controller when the identifier signal correlates with the local probe address.

Claims

1. A fluid status detection system comprising:

a controller, a plurality of probes for sensing the status of fluids at probe locations remote from the controller, and a transmission line connecting said controller and said probes, wherein said controller comprises;

a controller output, a controller input, means for providing a command signal to said controller output and a means responsive to signals received at said controller input for providing an indication of said fluid status at said probe locations;

said probes each comprising;

sensing means for providing a plurality of status signals representative of one or more fluid conditions and for applying said status signals to a plurality of probe data channels, a probe input, and a probe output;

said transmission line connecting said controller output to said probe input and said controller input to said probe output,

wherein said command signal comprises a probe identifier signal representative of a particular one of said probes and a probe data signal representative of a particular one of said probe data channels; and

wherein each of said probes further comprises;

means for storing a local probe address;

means for comparing said probe identifier signal to said local probe address, selecting means responsive to said data signal for selecting one of said data channels, and means communicating with said means for comparing for providing a signal corresponding to the signal on said selected data channel to said probe output when said identifier signal correlates with said local probe address.

2. The fluid detector of claim 1 wherein said plurality of probes comprises a first probe including a first sensing means for sensing one or more first fluid conditions and a second probe including a second sensing means for sensing one or more second fluid conditions, at least one of said second fluid conditions being a different condition than any of the conditions sensed by said first sensing means.

3. The fluid detector of claim 2 wherein said first sensing means includes a fluid level sensor, and said second sensing means includes a liquid-gas sensor.

4. The fluid detector of claim 3 wherein said first sensing means includes a plurality of temperature sensors.

5. The fluid detector of claim 4 wherein said first sensing means includes a water-hydrocarbon sensor.

6. The fluid detector of claim 1 wherein said selecting means comprises a multiplexer.