Communications: electrical – Continuously variable indicating – Using a particular modulation
Patent
1980-12-18
1982-09-07
Groody, James J.
Communications: electrical
Continuously variable indicating
Using a particular modulation
73DIG1, 34087039, 34087042, 3408703, G08C 1912, G08C 2500
Patent
active
043486738
ABSTRACT:
Instrument system including an electronic transmitter for a vibrating-wire differential-pressure sensor at a field location and connected by a two-wire line to a control room. The transmitter includes an oscillator to produce vibrations of the wire at its resonant frequency, and applies to the two-wire line a corresponding alternating voltage signal. The control room equipment converts this raw measurement data to an analog measurement signal. The control room equipment provides for adjustment of the zero and span of this signal, and for linearization with respect to the input differential pressure. The two-wire line carries a direct-current component the average value of which is automatically adjusted at the control room to match the scaled and linearized analog measurement signal. This line current passes through a meter at the transmitter to provide field service personnel with a visual indication of the value of the scaled and linearized measurement signal.
REFERENCES:
patent: Re27596 (1973-03-01), Hurd
patent: 3387266 (1968-06-01), Swartwout et al.
patent: 3560948 (1971-02-01), Inose et al.
patent: 3683344 (1972-08-01), Saito
patent: 3948098 (1976-04-01), Richardson et al.
patent: 3975719 (1976-08-01), Frick
patent: 4084155 (1978-04-01), Herzol et al.
patent: 4118977 (1978-10-01), Olsen et al.
Groody James J.
The Foxboro Company
LandOfFree
Instrumentation system with electric signal transmitter does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Instrumentation system with electric signal transmitter, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Instrumentation system with electric signal transmitter will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1344842