Measuring and testing – Gas analysis – Gas chromatography
Patent
1984-02-14
1985-12-03
Kreitman, Stephen A.
Measuring and testing
Gas analysis
Gas chromatography
73 16, G01N 3100
Patent
active
045559309
ABSTRACT:
A digital gas sensing system comprises a plurality of satellite subassembly units each including a central processing unit (CPU) and a plurality of "intelligent" sensors connected to the satellite subassembly units by a single pair of leads. The satellite subassembly units communicate to the sensors in a code having a predetermined number of digital bits. Each sensor has internal "intelligence" and recognizes its own unique address and responds to the satellite subassembly unit in a predetermined code that varies from the satellite subassembly unit code by one parity bit. This arrangement makes it possible for other sensors to distinguish between transmissions from the satellite subassembly unit and transmissions from other sensors. The net result is that the system is able to operate very reliably using only two leads to connect all of the sensors to the satellite sub subassembly unit thereby greatly reducing the wiring and installation costs of the system. To further expand the potential of the system it is also possible to link a plurality of satellite subassembly units together to a single master control unit.
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Leach Thomas W.
Schaeffer James
Control Instruments Corp.
Kreitman Stephen A.
Woodbridge Richard C.
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