Sandpiper RuppTech Stroke Counter/Batch Control Bedienungsanleitung PDF herunterladen (Seite 3)

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520-180-000 3/02 Batch Control / Stroke Counter Page 3

Programming for Accuracy

Topresetaccuratebatchprograms,itisimportanttoknowactualsystem

performance.Gatherthisinformationbymeasuringoutputvolumesgener-

atedbytestrunsofthesystems,usingpublishedpumpperformanceas

astartingprogram.Carefulmeasurementwilltellyouhowmuchvolume

yoursystemisactuallydischargingoneverystroke.Youcanthenadjust

theprogramaccordingly.Hereisanexample.

EXAMPLE OF USE:

Aproductisblendedbasedonincomingorders.Twoingredientsare

mixedinaratioof3to1,creatingthenalproduct.

Ordervolumesaretypically50,500,1000,1500and2000gallons.Two

pumpstransfertheingredientstoamixingareafor“batching”.

Pump#1inthisexampleisthetransferpumpforthemainelement.Its

controlhasPresetCountssetasfollows:

Pump#1PresetCounts:......... PO-37.5gallons..... P1-375gallons

................................................ P2-750gallons....... P3-1125gallons.

................................................ P4-1500gallons

StrokeScaleValve:................. 0.34gallonsperstroke

Thecontrol’sStrokeScaleValueissetatthedisplacementperstrokeof

the1½-inchpumptowhichitisconnected,.34gallons.

Pump#2inthisexampleis thetransferpumpfor thesecond element.

ItscontrolhasPresetCountsset

asfollows,basedonthe3to1mixing

ratio:

Pump#2PresetCounts:......... PO-12.5gallons..... P1-125gallons

................................................ P2-250gallons....... P3-375gallons

................................................ P4-500gallons

StrokeScaleValve:................. 0.09gallonsperstroke

Pump#2’scontrolhastheStrokeScaleValuesetatthedisplacement

perstrokeofthe1-inchpumptowhichitisconnected,.09gallons.

Thougheachpumprequiresitsowncontrolunit,bothcontrolscanbe

tiedtogetherwithoneremoteStart/Stopswitchrunningbothunits.

TESTING THE SYSTEM

Sinceeachcontrolgetsonepulseorsignal

from its pump for each stroke, the volumes

referencedintheexampleshouldbesetforthe

closesttotalvolumeavailable.

For example:

Pump#1.............P1-375gallons@

............................0.34gal.perstroke

............................=1102.94strokes

Adjusting for 1103 strokes would deliver

375.02gallons,assuming100%efciencyfrom

pumpandsystem.Realisticexpectationsofa

well-designedandimplementedsystemfallin

therangeof1%to3%.

Basedondataobtainedfromthesystem,

it becomes evident where the system will

perform from an accuracy and efficiency

standpoint.This will indicate adjustments to

bemade.

For example:

Testing showed in the example system

thatPump#1delivered363.93gallons,within

the 3% range of accuracy. Since the Stroke

ScaleValuewassetat.34gallonsperstroke,

1103strokesactuallyproduced.329gallons

perstroke.

Formula is:

Flow÷Strokes=GallonsperStroke

 363.93÷ 1103=0.329gal./stroke

This test indicates the system should be

resettoproduceatotalowclosertothebatch

targetof375gallons.

Formula is:

BatchTarget÷Gal.perStroke=#Strokes

 375 ÷0.329=1139.81

 Roundedto1140strokes

The controller cannot count a fractional

stroke,sothe numberof strokesis rounded

tothenearestwholenumber,1140.Thisgets

closertothetargetbatchsizeof375gallons,

actuallyproducing375.06gallons.

Thesametypeoftesting,calculationand

adjustmentwouldbeappliedtoallpumpsin

a system. Each pump’s performance will be

effected by the application and system

intotal.

WHERE TO FIND PUBLISHED PUMP

PERFORMANCE

Published pump performance is found on the data sheet

issued for model pump. Displacement is shown to the right

of the performance curve.

If you do not have the appropriate data sheet, contact your

local Warren Rupp or Marathon distributor for a copy. Or

you can contact the Factory Literature Department at the

number shown below.

To receive the correct sheet, be sure to verify the pump

model and type, which is shown on the pump nameplate.

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