Intrinsically safe photoelectric sensing

Details Intrinsically safe photoelectric sensing Intrinsically safe photoelectric sensing

1981-08-17

1983-12-13

Griffin, Robert L.

Telecommunications

Receiver or analog modulated signal frequency converter

Signal selection based on frequency

358700, 34087029, H04B 900

Patent

active

044208405

ABSTRACT:
An intrinsically safe sensing system does not degrade the output signal from the sensor in a hazardous environment, and is simple and efficient. Necessary circuitry is mounted on a single module in a safe area. A transmitting circuit has a transistor mounted on the hazardous end of the barrier, the barrier being located in the safe area, and connects through a cable to a photoelectric transmitter located in the hazardous area. A receiving circuit has an amplifier mounted on the "hazardous" end of the barrier, so that the signal from a photoelectric receiver within the hazardous area is not degraded. The photoelectric transmitter and receiver are ac coupled.

REFERENCES:
patent: 2989623 (1961-06-01), Byrne
patent: 3417390 (1968-12-01), Turtle
patent: 3619629 (1971-11-01), Matthews
patent: 3624449 (1971-11-01), Morgan
patent: 3631264 (1971-12-01), Morgan
patent: 3813578 (1974-05-01), Tiffany
patent: 3997733 (1976-12-01), Sanders
patent: 4021665 (1977-05-01), Haas et al.
patent: 4096382 (1978-06-01), Numata et al.
patent: 4207464 (1980-06-01), Fukuyama et al.
patent: 4211923 (1980-07-01), Fukuyama et al.
patent: 4217492 (1980-08-01), Fayfield
patent: 4260981 (1981-04-01), Yamauchi
patent: 4264897 (1981-04-01), Farmsworth

Affiliated with

Also associated with

Rating

Intrinsically safe photoelectric sensing does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Intrinsically safe photoelectric sensing, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Intrinsically safe photoelectric sensing will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-807160