Required Measuring Section; Direction Of Flow - TESTO 6457 Instruction Manual

5.4

Required measuring section

Note
Total measurement section = inflow section + outflow section = 5 x D
Inflow route = 15 x D + B
D = pipe diameter [mm]
B = additional calming section
5.5

Direction of flow

Note
26
Take account of the required inflow and outflow section in
order to achieve the specified measuring accuracy. The inflow
section refers to the pipeline length upstream of the compressed
air meter and the outflow section to the pipeline length
downstream of the compressed air meter, as seen in the
direction of flow for the medium.
Changes to the
pipe diameter
90° elbow
Two 90° elbows, one level
Two 90° elbows, two levels
Valve, slider
Take the direction of flow into account when installing the
measuring station. This is indicated by the arrow engraved
on the side of the measuring station. The arrow points in the
direction in which the medium flows in the pipeline.
B = 5 x pipe diameter
B = 5 x pipe diameter
B = 10 x pipe diameter
B = 15 x pipe diameter
B = 35 x pipe diameter