Testo Ag

Testo Gmbh & Co.

Manfred Streicher

Martin Rombach

Andreas Derr

Peter Schulz

Jürgen Hall

Udo Hug

A measuring arrangement for determining flow speeds in a flow channel includes a probe tube which is introduced via a first opening into the flow channel. The probe tube is exposed to a flow with a flow speed, the side of the probe tube facing the flow comprising a plurality of openings which are interconnected inside the probe tube such that a total pressure dependent on the flow speed prevails inside the probe tube. The measuring arrangement also comprises a static pressure opening in the flow channel, and a differential pressure sensor that determines the differential pressure between the total pressure inside the probe and the static pressure in the flow channel. The probe tube may be partially surrounded by a shield which is mobile and/or length-adjustable and that, according to its position and/or length along the probe tube, may close one, several or none of the openings.

Measuring arrangement for flow measurement in a channel

The invention relates to a module for measuring purposes comprising an electrical or electronic circuit, which has at least one power supply connection and at least one data line connection for connecting, in the manner of a bus, to at least one other module of the same type that is also used for measuring purposes. According to the invention, the electronic circuit () is arranged inside a housing, the housing has a first contact surface () and a second contact surface (), and the first contact surface () is joined to the second contact surface () of the other module () in a manner that permits it to be mechanically detached. The at least one power supply connection has a power supply contact () in the first contact surface () and has a corresponding power supply contact () in the second contact surface (). The at least one data line connection has a data line contact () in the first contact surface () and has a corresponding data line contact () in the second contact surface (). When the first contact surface () is joined to the second contact surface () of the other module (), the power supply contact () in the first contact surface () is connected in an electrically conductive manner to the corresponding power supply contact () in the second contact surface () of the other module (), and the data line contact () in the first contact surface () is connected in an electrically conductive manner to the corresponding data line contact () in the second contact surface () of the other module ().

Module for measuring purposes

The flow velocity of the medium is determined with the aid of a temperature-dependent resistor. The measurement probe is located in a partially open measurement chamber. The measurement chamber has an inlet port and an outlet port of different sizes. Only if the flow enters through the smaller inlet port and exits through the larger outlet port, is the actual flow velocity measured. When the flow enters through the outlet port, the measured value is less by about 30%. From this difference the direction of flow can be clearly determined.

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Lenzkirch, Germany

Manfred Streicher