Patent ID: 9228871
Filing Date: 2016-01-05
CPC Classification: G01F

Claim Text:
1. A thermal, flow measuring device for measuring the flow of a measured medium through a measuring tube, comprising: a first electrical current source; a second electrical current source; an electrical circuit, which has a first resistor and a second resistor, each of which is arranged in a housing bordering the lumen of the measuring tube, and at least one switch, which is switchable such that, in a first switch position, said first resistor is connected in series with said first electrical current source, in a second switch position, said first resistor is connected in series with said second electrical current source, and, in a third switch position, said second resistor is connected in series with said second electrical current source, wherein: in said first switch position, a shunt resistor is connected in series with said first resistor and with said first electrical current source for measuring a voltage drop across said shunt resistor, and in said second switch position, a bypass resistor is connected in series with said first electrical current source such that with switching between said first switch position and said second switch position said first electrical current source experiences similar resistances and therefore no significant load jumps.