Electromagnetic flowmeter

Details Electromagnetic flowmeter Electromagnetic flowmeter

2008-11-11

2011-11-29

Tsai, Carol (Department: 2857)

Data processing: measuring, calibrating, or testing

Measurement system in a specific environment

Mechanical measurement system

C702S050000, C702S100000, C702S038000, C073S861170, C073S861120, C073S861160, C324S306000, C324S307000, C324S309000

Reexamination Certificate

active

08068998

ABSTRACT:
An electromagnetic flowmeter that prevents fluctuations in the frequency of synchronized pulse signals due to momentary fluctuations of the power source voltage. The comparator of an AC synchronizing circuit that generates pulse signals synchronized to the frequency of a commercial power source is given a hysteresis function in which a first threshold value Vth1and a second threshold value Vth2are set up in the comparator. The comparator compares the level of divided AC signals from a dividing circuit with the first threshold value Vth1, and if the level of the divided AC signals exceeds the first threshold value Vth1, the level of the synchronized pulse signals is inverted from the “L” level to the “H” level; and if the level of the divided AC signals falls below the second threshold value Vth2, the level of the synchronized pulse signals is inverted from the “H” level to the “L” level.

REFERENCES:
patent: 3783687 (1974-01-01), Mannherz et al.
patent: 3965738 (1976-06-01), Watanabe
patent: 4010644 (1977-03-01), Bonfig et al.
patent: 4373400 (1983-02-01), Sekiguchi
patent: 4644799 (1987-02-01), Tomita
patent: 4709583 (1987-12-01), De Paepe et al.
patent: 4856345 (1989-08-01), Mochizuki
patent: 5388465 (1995-02-01), Okaniwa et al.
patent: 5394023 (1995-02-01), Gleim et al.
patent: 5443552 (1995-08-01), Tomita
patent: 5646353 (1997-07-01), Mesch et al.
patent: 6845330 (2005-01-01), Okuda et al.
patent: 6847901 (2005-01-01), Suzuki et al.
patent: 6937943 (2005-08-01), Budmiger
patent: 7369949 (2008-05-01), Yamamoto
patent: 56-107123 (1981-08-01), None
patent: 62-34083 (1987-07-01), None
patent: 04-340423 (1992-11-01), None
patent: 05-113358 (1993-05-01), None
patent: 07-9374 (1995-02-01), None
patent: 2000-046606 (2000-02-01), None
European Search Report dated Feb. 11, 2009 appended to EP 2 060 878 A1, which is the E.P. counterpart to the instant U.S. Appl. No. 12/268,545.

Affiliated with

Also associated with

Rating

Electromagnetic flowmeter does not yet have a rating. At this time, there are no reviews or comments for this patent.

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

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-4279755