Method and apparatus for automatically reading a mechanical flui

Details Method and apparatus for automatically reading a mechanical flui Method and apparatus for automatically reading a mechanical flui

1989-03-14

1991-01-22

Willis, Davis L.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

25023114, H01J 4014

Patent

active

049872974

ABSTRACT:
The apparatus includes at least one light-reflecting element (11) disposed on a portion of at least one of the conventional rotary elements (10) of the mechanism of a mechanical fluid meter. The apparatus further includes a light-emitting circuit (130) and a light-detecting and converting circuit (140) with first and second concentric fibers (21, 22) providing an optical connection between the circuits and the meter. The electrical signal delivered by the conversion circuit (140) is amplified and the amplified electrical signal is compared with first and second thresholds (S1, S2). An alarm and indicator circuit is responsive to the comparison made with the first threshold (S1), and a circuit (190) counts and stores the pulses delivered after comparison with the second threshold (S2).

REFERENCES:
patent: 4320394 (1982-03-01), John, Jr.
patent: 4606632 (1986-08-01), Hillerich
patent: 4680704 (1987-07-01), Konicek et al.
patent: 4745293 (1988-05-01), Christensen
patent: 4767164 (1988-08-01), Yeung
patent: 4772800 (1988-09-01), Kanai et al.

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