| 摘要 |
A thermal flowmeter for determining and/or monitoring a thermal mass flow of a measurement medium, comprising a sensor element (1, 11, 21) with a measuring tube (2, 12, 22) with a tube wall (7, 17, 27) and with at least one first temperature sensor element and one second temperature sensor element which are in the form of resistance thermometers (3, 13, 23, 33), in particular, wherein at least one of the temperature sensor elements can be heated, wherein the measuring tube (2, 12, 22) has a longitudinal axis (A) and a tube contour (8, 18, 28) with a first tube cross section in the end regions of the measuring tube (2, 12, 22), wherein the measuring tube (2, 12, 22) has a constriction with a second tube cross section which differs from the first tube cross section in terms of shape and/or surface area, wherein the constriction is divided into at least two segments (6, 16, 26), wherein at least one of the segments (6, 16, 26) is bent by an angle (α) of at least 5° with respect to the longitudinal axis (A) of the measuring tube (2, 12, 22), and wherein one of the temperature sensor elements is arranged each case in one of the two segments (6, 16, 26) from the outside on the tube wall (7, 17, 27) of the measuring tube (2, 12, 22) and is in thermal contact with the measurement medium. |
