Process machinery control system and individual safety control s

Details Process machinery control system and individual safety control s Process machinery control system and individual safety control s

1978-02-24

1979-03-13

Gill, James J.

Signals and indicators

Indicators

Fluid flow

137552, 137557, F16K 3700, G08B 104

Patent

active

041436164

ABSTRACT:
A selectively changeable pneumatic control system for monitoring the start-up and running of process machinery, the system having a pneumatically operated indicator, a pneumatically operated arrangement for operating the indicator and a selector for setting the pneumatically operated arrangement to any one of a first, second, third, fourth or fifth monitoring condition thereof which monitors a respective variable of the process machinery and will operate the indicator to indicate an unsafe condition thereof, the first condition being adapted to monitor a variable of the process machinery that is normally safe when the process machinery is not running, the second condition being adapted to monitor a variable of the process machinery that is normally unsafe when the process machinery is not running but must be locked out to allow start-up and must become safe within a predetermined time period after initial start-up, the third condition being adapted to monitor a variable of the process machinery that is normally unsafe when the process machinery is not running but must be locked out to allow start-up and remain locked out an indefinite time period after start-up until it becomes safe, the fourth condition being adapted to monitor an alarm variable of the process machinery that requires immediate attention upon becoming unsafe, the fifth condition being adapted to monitor a position of a variable of the process machinery.

REFERENCES:
patent: 2754793 (1956-07-01), Sperry
patent: 2868155 (1959-01-01), Phillips
patent: 3254670 (1966-06-01), Puster
patent: 3720182 (1973-03-01), Harrah
patent: 3948207 (1976-04-01), St. Paul

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