PROline Promag 53 6 Commissioning
Endress+Hauser 85
6.2.3 “Pulsating Flow” Quick Setup menu
Certain types of pumps such as reciprocating, peristaltic and cam-type pumps, for
example, create a flow characterized by severe periodic fluctuations (Fig. 48). Negative
flows can occur with pumps of these types on account of the closing volume of the
valves or valve leaks.
Fig. 48: Flow characteristics of various types of pump
A = With severely pulsating flow
B = With slightly pulsating flow
1 1-cylinder cam pump
2 2-cylinder cam pump
3 Magnetic pump
4 Peristaltic pump, flexible connecting hose
5 Multi-cylinder reciprocating pump
Severely pulsating flow
Once several device functions have been configured in the “Pulsating Flow” Quick
Setup menu, flow fluctuations can be compensated over the entire flow range and
pulsating fluid flows measured correctly.
You will find detailed instructions on how to use this Quick Setup menu on Page 86.
!
Note:
It is always advisable to work through the “Pulsating Flow” Quick Setup menu if there is
any uncertainty about the exact flow characteristic.
Slightly pulsating flow
If flow fluctuations are no more than minor, as is the case, for example with gear-type,
three-cylinder or multi-cylinder pumps, it is not absolutely necessary to work through
the “Pulsating Flow” menu.
In cases of this nature, however, it is advisable to adapt the functions listed below in the
function matrix (see “Description of Device Functions” manual) to suit local process
conditions in order to ensure a stable, unvarying output signal. This applies particularly
to the current output:
• Measuring system damping: FLOW DAMPING function → increase the value
• Current output damping: TIME CONSTANT function → increase the value
F06-xxxxxxxx-05-xx-xx-xx-013
To Next Page
Loading...
