Boots – shoes – and leggings
Patent
1994-12-30
1996-06-04
Voeltz, Emanuel T.
Boots, shoes, and leggings
364509, 364507, 73 2322, 73 2325, 7320419, 73 2327, G01F 112
Patent
active
055240844
ABSTRACT:
In the preferred embodiment, the invention is embodied in the pneumatic manifold of a gas chromatograph to provide current operating temperature and pressure compensation of inlet fluid flow. The pneumatic manifold comprises a plurality of thermally coupled mass flow, pressure and temperature sensors which generate signals related to mass flow of the fluid, fluid pressure and sensor temperature prior to the introduction of the fluid into the column. A plurality of firmware models which characterize the effects of current operating temperature and pressure variations on the mass flow and pressure sensors are stored in computer memory. Compensation is provided by determining the desired flow into the inlet, determining the control signal required to achieve this values at current operating conditions, determine the current operating conditions, implementation of firmware models to determine the effects on flow due to changes in current operating conditions and finally, generation of an adjustment to the control signal that nullifies the effects caused by changes in current operating conditions. These steps are repeated continuously to provide closed loop control of the desired detector conditions.
REFERENCES:
patent: 4586142 (1986-04-01), Cota et al.
patent: 4994096 (1991-02-01), Klein et al.
patent: 5108466 (1992-04-01), Klein et al.
patent: 5476000 (1995-12-01), Henderson et al.
Lucas Control System Products, NOVASENSOR Sales Brochure, includes: Short Form Catelog,NPI Series All Media Solid State Sensor Pressure Transducer--Medium Pressure and High Pressure Brochures, NPH Series Solid State Pressure Sensor--Medium Pressure, and Low Pressure Brochures, NAS Series Solid State Accelerometer Signal Conditioned.
Output Brochure, NAC Series Silicon Accelerometers-Ceramic Packages Brochure.
Wang Tak K.
Wikfors Edwin E.
Hewlett--Packard Company
Schuette Richard F.
Smith Demetra R.
Voeltz Emanuel T.
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