Onicon F-5100 Inline Bedienungsanleitung PDF herunterladen (Seite 11)

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F-5100 Inline Thermal Mass Flow Meter Manual 05/15 - 0686-11 / 18332 Page 11

Minimum Straight Run required upstream of ow meter process connection based on

the nature of the upstream obstruction.

Minimum Downstream

Straight Run Required

After Flow Meter

Process Connection

Upstream

Obstructions

Single bend

preceded by ≥ 9

diameters of

straight pipe

Pipe size

reduction in

straight pipe run

Multiple bends

in plane with

< 9 diameters

of straight pipe

between them

Pipe size

expansion in

straight pipe run

Tees

Multiple

bends out

of plane

Modulating

Regulating

valves

Roots or

Diaphram

Utility

Meters

Nom. Dia.

¼” None 2.5” 2.5” 2.5” 2.5” None

⅜” 1.25” 3.75” 3.75” 3.75” 3.75” None

½” 1.5” 5” 5” 5” 5” None

¾” 2.25” 7.5” 7.5” 7.5” 7.5” 1”

1” 3” 10” 10” 10” 10” 1”

1¼” 3.75” 12.5” 12.5” 12.5” 12.5” 2”

1½” 4.5” 15” 15” 15” 15” 2”

2” 6” 20” 20” 20” 20” 4”

2½” 7.5” 25” 25” 25” 25” 7”

3” 9” 30” 30” 30” 30” 9”

4” 12” 40” 40” 40” 40” 12”

IMPORTANT NOTICE

Always use the maximum available straight run. When more than the minimum required straight

run is available place the meter such that the excess straight run is upstream of the meter location.

The ow meter must also be properly installed with respect to the direction of ow. Installing the

meter with the ow arrow pointing in the wrong direction will result in signicant errors in the

ow measurement.

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