Endress+Hauser RMS 621 - Applications

RMS 621 11 Appendix
Endress+Hauser 69
meter deviates from the ideal flow curve. Using the correction table this deviation can be
compensated.
This correction is done in different ways dependent on the type of flow meter:
• Analogue signal (volumetric, mass)
Table with up to 15 paired values current/flow
• Pulse signal (volumetric, mass)
Table with up to 15 paired values (frequency/k factor or frequency/pulse value, dependent on
signal type)
• Differential pressure/square root extracted
Table with up to 10 paired values (flow/factor ƒ)
!
Note!
When using a Pitot tube sensor the so called resistance value ζ (blockage factor) can be mirrored by
the correction factor ƒ. Should the resistance value be constant then it is sufficient to define two
paired values flow/(correction) factor. This correction factor is then valid for the total measurement
range.
!
Note!
The correction points are automatically sorted by the device, this means the points can be defined
in any order.
Please note that the operational mode lies within the limits of the table as values outside the table
range are calculated by extrapolation. This can lead to high inaccuracies.
11.3 Applications