Proline Promass 83E/F/O Modbus RS485 Operating Instructions

CommissioningProline Promass 83 Modbus RS485!Note!!Note!6.3.2 Quick Setup "Pulsating Flow"The "Pulsating flow" Quick Setup is only available if the device has a current output or a pulse/frequency output.Certain types of pump such as reciprocating, peristaltic and cam-type pumps, for example, create aflow characterized by severe periodic fluctuations . Negative flows can occur with pumps of thesetypes on account of the closing volume of the valves or valve leaks.Before carrying out the Quick Setup "Pulsating Flow" the Quick Setup "Commissioning" ä 60has to be executed.AQQBQ1t2 5ttQQ3t4tFig. 42: Flow characteristics of various types of pumpA With severely pulsating flowB With low pulsating flowa00012131 1-cylinder cam pump2 2-cylinder cam pump3 Magnetic pump4 Peristaltic pump, flexible connecting hose5 Multi-cylinder reciprocating pump!Note!Severely pulsating flowOnce several device functions have been configured in the "Pulsating flow" Quick Setup menu, flowfluctuations of this nature can be compensated over the entire flow range and pulsating fluid flowsmeasured correctly. Below you will find detailed instructions on how to use this Quick Setup menu.It is always advisable to work through the "Pulsating flow" Quick Setup menu if there is anyuncertainty about the exact flow characteristic.Slightly pulsating flowIf flow fluctuations are no more than minor, as is the case, for example with gear-type, threecylinderor multi-cylinder pumps, it is not absolutely necessary to work through the Quick Setupmenu.In cases of this nature, however, it is advisable to adapt the functions listed below in the functionmatrix (see the "Description of Device Functions" manual) to suit local process conditions in orderto ensure a stable, unvarying output signal:• Measuring system damping: FLOW DAMPING function Increase value.• Current output damping: TIME CONSTANT function Increase value.Page 62 • MN0M030Issue/Rev. 0.2 (12/12)