Measuring and testing – Volume or rate of flow – Combined
Patent
1996-11-22
1998-09-22
Raevis, Robert
Measuring and testing
Volume or rate of flow
Combined
722 14, B67B 700
Patent
active
058116753
ABSTRACT:
A modular gas meter comprising a basic meter module, including a solenoid operated gas valve, a gas flow measurement arrangement and a gas valve control system, including a first optical interface which facilitates the transmission of control data to or from the control system, which basic module is adapted to be operatively combined with an add-on module so as to extend meter functionality, which add-on module comprises a module control system, which operates to control functionality and which includes a second optical interface, arranged for communication with the first optical interface when the two modules are mutually operatively combined, so that when functionality demands, an appropriate request signal is transmitted via the optical interfaces to request opening of the gas valve, and a manually operated switch to which the module control system is responsive for sending an enable signal via the interfaces to the valve control system, whereby operation of the gas valve to effect gas supply via the meter in response to a request signal is effected only if the switch is contemporaneously operated to provide the enable signal.
REFERENCES:
patent: Re29495 (1977-12-01), Georgi
patent: 1377635 (1921-05-01), Smith
patent: 3586050 (1971-06-01), Totten
patent: 4550859 (1985-11-01), Dow, Jr. et al.
patent: 5124934 (1992-06-01), Kawamoto et al.
patent: 5133480 (1992-07-01), Matsumoto et al.
patent: 5257538 (1993-11-01), Spendell
patent: 5433342 (1995-07-01), Luro
Raevis Robert
Siemens Measurements Limited
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