Proline t-mass 65 PROFIBUS DP/PA Installation
Endress+Hauser 15
3.2.5 Inlet and outlet runs
The thermal dispersion principle is sensitive to disturbed flow conditions.
As a general rule, the thermal flowmeter should always be installed as far away as possible from any
flow disturbances. For further information please refer to ISO 14511.
!
Note!
• Where two or more flow disturbances are located upstream of the meter, the longest indicated
inlet length should prevail. For example if a control valve and a bend are mounted upstream of
the flowmeter, the recommended inlet length should be according to the control valve (50 × DN).
• For very light gases such as Helium and Hydrogen all upstream distances should be doubled.
The minimum recommendations for inlet and outlet runs (without flow conditioner) are:
Flanged sensor
Insertion sensor
!
Note!
A specially designed perforated plate flow conditioner can be installed if it is not possible to observe
the inlet runs required ( ä 16).
1
a0007523
2
a0007524
3
a0007525
4
a0007526
5
a0007527
6
a0007528
1 = Reduction, 2 = Expansion, 3 = 90° elbow or T-piece, 4 = 2 × 90° elbow, 5 = 2 × 90° elbow (3-dimensional),
6 = Control valve
1
a0007529
2
a0007530
3
a0007531
4
a0007532
5
a0007564
6
a0007534
1 = Reduction, 2 = Expansion, 3 = 90° elbow or T-piece, 4 = 2 × 90° elbow, 5 = 2 × 90° elbow (3-dimensional),
6 = Control valve or pressure regulator
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