Honeywell International Inc.

Honeywell G.m.b.h.

Thomas P Overholt

Max C Glenn

Douglas W Wilda

Raymond F McMullen

Michael D Carney

Mark Striano

Jack Elias

James V Davidson

A controller input/output module visual indicator and safety means including a light redirector, terminal block assembly and at least one circuit having at least one light emitting diode or like light transmission means positioned distally from terminal block assembly. Each light redirector is configured to receive light from each corresponding light transmission means on a proximate end and redirect the light information to a distal end adjacent to the terminal block assembly for viewing by the control operator. An optional shield or side barrier may optionally be coupled to the circuit to provide operator safety from the high voltage signals which may exist on each input/output module.

Controller input/output module visual indicator and safety means

The apparatus of the invention includes a sensor header and a sensor cover which are coupled to a prior art diaphragm assembly. The sensor header is provided with two piezoresistive silicon membrane strain gauges. One side of both strain gauges is exposed to fluid at upstream high pressure. The other side of the first strain gauge is exposed to fluid at downstream low pressure and the other side of the second strain gauge is exposed to the atmosphere. The sensor header is provided with a first port which is fluidly coupled to the first membrane strain gauge and extends to the surface of the header at a first location. The sensor header is provided with a second port which is fluidly coupled to the second membrane strain gauge and extends to the surface of the header at a second location. The sensor cover defines two isolated annular spaces around the sensor header, a first annular space around the first location and a second annular space around the second location. The first annular space is fluidly coupled to the low pressure port of a conventional diaphragm assembly and the second annular space is fluidly coupled to the atmosphere. The method of the invention is to provide two piezoresistive membrane strain gauges, expose a first side of each strain gauge to fluid at upstream high pressure, expose the second side of the first strain gauge to fluid at downstream low pressure, and expose the second side of the second strain gauge to atmospheric pressure.

Methods and apparatus for sensing differential and gauge static pressure

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Chalfont, PA, United States of America

Thomas P Overholt