Temperature transducer for KYZ pulse recorder

Details Temperature transducer for KYZ pulse recorder Temperature transducer for KYZ pulse recorder

Filed on

1987-04-22

Date issued

1989-10-24

Examiner

Cuchlinski, Jr., William A.

Patent Class

Thermal measuring and testing

SubClass

Temperature measurement

SubSubClass

By electrical or magnetic heat sensor

Other Related Categories

374178, 374186, G01K 700

Type

Patent

Status

active

Patent number

048757837

Description

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.

REFERENCES:
patent: 3978471 (1976-08-01), Kelly
patent: 4277975 (1981-07-01), Pinkham
patent: 4615009 (1986-09-01), Battocletti et al.
patent: 4697182 (1987-09-01), Swanson
"Integrator Circuits", John Markus, Modern Electronic Circuits Reference Manual, Chapter 41, pp. 468-472, McGraw-Hill, Inc., 1980.
"Temperature Measuring Circuits", John Markus, Modern Electronic Circuits Reference Manual, Chapter 94, pp. 1049-1063, McGraw-Hill, Inc., 1980.
"Technotes Metretek Temperature Monitor", Metretek Incorporated, date unknown.

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