Fast/accurate calibration for a physical property sensor

• US 4,764,879 A
• Filed: 06/25/1987
• Issued: 08/16/1988
• Est. Priority Date: 06/25/1987
• Status: Expired due to Fees

• Current Assignee: YSI Incorporated (Xylem, Inc.)
• Original Assignee: The Yellow Springs Instrument Company Incorporated
• Inventors: Campbell, James M.
• Primary Examiner(s): Pitts, Harold I.
• Application Number:
  US07/067,338
• Time in Patent Office: 418 Days
• Field of Search: 364/482, 364/571, 235/464, 235/472
• US Class Current: 702/91
• CPC Class Codes: G01D 18/002 Automatic recalibration G01D18/008 takes precedence
• CPC Class Codes: G01K 1/02 Means for indicating or recording specially adapted for thermometers
• CPC Class Codes: G06K 19/04 characterised by the shape
• CPC Class Codes: G06K 7/10861 sensing of data fields affixed to objects or articles, e.g. coded labels postal sorting B07C3/14, conveying articles B65G47/48

Abstract

The unique signal generating characteristics of a sensing transducer are defined by integrally incorporating an encoded form of the characteristics into the sensing transducer such that the encoded characteristics can be read by a data reader incorporated into a signal conditioner used with the sensing transducer. The encoded data is incorporated as an inseparable part of each operable sensing transducer by being molded or otherwise formed into a connecting cable of the sensing transducer or engraved or otherwise formed onto the barrel of a connector plug for interconnecting the transducer to the signal conditioner. The encoded data portion of the cable is passed through a reader externally mounted on the signal conditioner, or the encoded data on the barrel of a connector plug is read as the connector plug is inserted into a connector socket on the signal conditioner.

Claims

1. Apparatus for sensing a physical property comprising:

a sensing transducer for generating signals representative of the physical property, said sensing transducer having unique signal generating characteristics;

a signal conditioner for receiving said signals from said sensing transducer and processing said signals in accordance with said unique signal generating characteristics to generate a usable signal identifiably reflecting said physical property;

reader means associated with said signal conditioner for reading encoded data; and

data means for encoding said unique signal generating characteristics of said sensing transducer, said data means being integrally incorporated into said sensing transducer whereby said signal conditioner can be quickly and accurately adapted to operate with a given sensing transducer by having said reader means read said data means for said given sensing transducer.

2. Apparatus as claimed in claim 1 further comprising connector means for interconnecting said sensing transducer and said signal conditioner and comprising first and second intermating parts, said first part being included within said signal conditioner and said second part being integrally incorporated as a part of said sensing transducer, said reader means is associated with said first part, and said data means is formed into said second part whereby said data means is read by said reader means as said first and second parts are intermated to interconnect said sensing transducer and said signal conditioner.

3. Apparatus as claimed in claim 2 wherein said data means comprises a bar code.

4. Apparatus as claimed in claim 1 further comprising connector means for interconnecting said sensing transducer and said signal conditioner and comprising a cable integrally connected to said sensing transducer, said data means is incorporated into said cable, and said reader means is adapted to read said data means as said data means is passed thereby.

5. Apparatus as claimed in claim 4 wherein said data means comprises a bar code.

6. In a monitoring system for sensing a physical property including a sensing transducer for generating signals representative of the physical property and having unique signal generating characteristics, and a signal conditioner for receiving said signals from said sensing transducer and processing said signals in accordance with said unique characteristics to generate a usable signal identifiably reflecting said physical property, calibration apparatus comprising:

data reader means associated with said signal conditioner for reading encoded data; and

data means for encoding said unique signal generating characteristics of said sensing transducer, said data means being integrally incorporated into said sensing transducer whereby said signal conditioner can be quickly and accurately adapted to operate with a given sensing transducer by associating said data means for said given sensing transducer with said reader means such that said unique signal generating characteristics for said sensing transducer are passed to said signal conditioner.

7. A monitorng system for sensing a physical property as claimed in claim 6 wherein said system further comprises connector means for interconnecting said sensing transducer and said signal conditioner and comprising first and second intermating parts, said first part being included within said signal conditioner and said second part being integrally incorporated as a part of said sensing transducer, said reader means being associated with said first part and said data means being formed into said second part whereby said data means is read by said reader means as said first and second parts are intermated to interconnect said sensing transducer and said signal conditioner.

8. A monitoring system for sensing a physical property as claimed in claim 6 wherein said data means comprises a bar code.

9. A monitoring system for sensing a physical property as claimed in claim 6 wherein said system further comprises connector means for interconnecting said sensing transducer and said signal conditioner and comprising a cable integrally connected to said sensing transducer, said data means is incorporated into said cable, and said reader means is adapted to read said data means as said data means is passed thereby.

10. A monitoring system for sensing a physical property as claimed in claim 9 wherein said data means comprises a bar code.