User Guide

ManualsBrandsBEKA ManualsRate TotalizerBEKA AG334 Externally Powered Pulse Input Rate Totalizer

4.2 Total Scale Factor

5cale

As shown in the previous section the Rate Totaliser

function factor is used to convert the number of input

pulses received into engineering units such as litres or

gallons.

If the Rate Totaliser’s total display is required in the

engineering units produced by factor no further scaling

is required. However, to enable the total display to

be in different engineering units, or in multiples of the

engineering units produced by factor such as thousand

of litres or gallons, an additional scaling factor 5CALE

t is

included.

5CALE

t is a dividing factor adjustable between 0.0001

and 99999 that divides the output of the factor function to

produce the total display in the required engineering units.

Fig 9 illustrates how 5CALE

t can be used to extend the

example shown in Fig 8 to produce a total display in m³.

Each pulse output from factor represent one litre of total

ow.Thereare1,000litresinacubicmetre,thereforethe

output from factor requires dividing by 1000 to convert it

to cubic metres m³.

1 pulse per litre of flow

70 pulses per

litre of flow

Flowmeter with

K-factor of 70

Flowmeter K factor factor

Set to 70

Rate scale factor 5cale

Set to 4.5461

Total scale factor 5cale

Set to 1000

Timbase t-ba5e

Set to 60 for rate per minute

Total Display

Cubic metres of flow m³

Rate Display

Gallons of flow per minute

1 pulse per

gallon of flow

1 pulse per cubic

metre m³ of flow

Fig 9 5cale . tsetto1000toproducetotalow

display in cubic metres m³

This can be illustrated with a simple example. To calculate

thetotalowinengineeringunitsmeasuredbyaowmeter

having a K-factor of 70 pulses per litre after it has output

1075 pulses.

Number of output pulses = 1075 = 15.36 litres

Flowmeter K-factor 70

All BEKA pulse input Rate Totalisers achieve this

conversion using a congurable dividing constant called

factor which can be adjusted between 0.0001 and 99999

as shown in Fig 7.

FortheowmeterinthisexamplehavingaK-factorof70

pulses per litre, the dividing constant factor in the Rate

Totaliser should be set to 70. After the Rate Totaliser

hasreceived70pulsesfromtheowmeteritwilltransfer

onepulse,representing1litreofow,tothefollowingRate

Totaliser adjustable functions Scale Factor 5cale r and

the Total Scale Factor 5cale t as shown in Fig 8.

Unless a resolution greater than one K-factor unit of

measurement is required, i.e. 1 litre in the above example,

for most applications factor should be set to the K-factor

of the owmeter.  Section 4.3.1 contains additional

information about Rate Totaliser resolution.