The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Oct. 24, 1989
Filed:
Apr. 22, 1987
Scott C Swanson, Roswell, GA (US);
Sangamo Weston, Inc., Norcross, GA (US);
Abstract
An improved temperature transducer for use with a KYZ pulse data recorder. A temperature sensor provides a temperature signal proportional to ambient temperature. An integrator circuit and comparator circuit responsive to the temperature signal provides pulses at a frequency which is proportional to temperature. The pulses are provided over the standard three-wire KYZ pulse cable to the input of the data recorder. The circuit is extremely low power, highly accurate, and requires only the three-wire KYZ connection. No external power supply or cable is required, since the circuit draws its power from the pull up resistors in the KYZ data recorder input. Also disclosed are techniques for improving accuracy and minimizing power consumption in the circuit, and an improved integrator circuit.