Abstract: A system for measuring a flow parameter of a fluid, comprising a conduit defining a flow passage for said fluid, said flow passage having a central axis means located in said flow passage for measuring a differential between a first resultant drag exerted by said fluid at a first distance from said central axis and a second resultant drag exerted by said fluid at a second distance from said central axis different from said first distance and means for determining said flow parameter from said differential, whereby said flow parameter is accurately measured regardless of viscosity changes in said fluid.

Abstract: A programmable logic circuit is formed by at least one gate. The gate is formed by four logic circuits, one being a first exclusive NOR circuit having a first input, a second input and an output. A second exclusive NOR circuit having a first input, a second input and output is provided, the first input of the second exclusive NOR circuit being coupled to the first input of said first exclusive NOR circuit. An AND circuit having a first input, a second input and an output is also provided. The first input of the AND circuit is coupled to the output of the first exclusive NOR circuit and the second input of the AND circuit means is coupled to the output of the second exclusive NOR circuit. A third exclusive NOR circuit having a first input circuit, a second input circuit and an output circuit is provided the first input circuit of the third exclusive NOR circuit is coupled to the output of the AND circuit.