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F-5200 Insertion Thermal Mass Flow Meter Manual 05/14 - 0756-8 / 19475 Page 12

In addition to the information provided above and on the previous page, the following diagram

and table should be used as a guide to the proper location for installing the meter.

Upstream obstruction

Minimum straight run required upstream of meter location

(A) Without Flow Conditioner (B) Upstream of Flow Conditioner

Single bend preceded by ≥ 9 diameters of

straight pipe

15 Diameters 3 Diameters

Pipe size reduction in straight pipe run 15 Diameters 3 Diameters

Multiple bends in plane with < 9 diameters

of straight pipe between them

20 Diameters 9 Diameters

Pipe size expansion in straight pipe run

30 Diameters 10 Diameters

Tees 30 Diameters 10 Diameters

Multiple bends out of plane 40 Diameters 5 Diameters

Modulating or regulating valve 40 Diameters 10 Diameters

Diaphram or ROOTS type utility meter 40 Diameters 10 Diameters

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 be properly installed with respect to the direction of ow. Installing the

meter with the UPSTREAM label facing downstream will result in signicant errors in the ow

measurement.

How to Determine the Available Straight Pipe Diameters:

For each application, locate the longest straight, unobstructed section of pipe (no bends,

tees, valves, other insertion probes, size transitions).The longest straight pipe run in

inches divided by nominal pipe size in inches equals “diameters of straight pipe.”

2 X Diameter

• For 1” and larger diameter pipes

• Install in vertical or horizontal pipe

• For horizontal pipe position meter

anywhere in upper 180°

CLEARANCE

REQUIRED

FOR INSTALLATION

30” - 36”

Depending on

pipe size

Vertical pipe position

2 Dia.

5 Dia.

FLOW

2 Dia.

5 Dia.

FLOW

FLOW DIRECTION

• For 1” and larger diameter pipes

• Install in vertical or horizontal pipe

• For horizontal pipe position meter

anywhere in upper 180º

1 2 ... 7 8 9 10 11 12 13 14 15 16 17 ... 26 27

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