BEKA BA334E User guide

Contents
1. Introduction
2. Selecting a model
2.1 Mounting
2.1.1 Field mounting
2.1.2 Panel mounting
2.2 Location
2.2.1 General purpose applications
2.2.2 Explosive atmosphere applications
2.3 Two input models
2.4 Operating temperature
3. Rate Totaliser function
4. RateTotaliserconguration
4.1 Flowmeter K-factor
4.2 Total scale factor
4.3 Rate scale factor
4.3.1 Resolution
4.4 Timebase
5. Linearisation
6. Pulse output
7. Optional 4/20mA output
8. Optional dual alarm outputs
9. Slide-in scale card
10. Congurationexamples
11. Additional information
Externally powered pulse input Rate Totalisers
1. Introduction
This Application Guide is intended to aid the selection
of the most suitable pulse input Rate Totaliser from the
extensive range of models manufactured by BEKA
associates.Theguidealsocontainsowmeasurement
backgroundinformationandcongurationexamples.
This guide does not contain detailed system design or step-
by-step conguration information which are contained in
the instruction manual for each model. Detailed installation
and certication information for use in hazardous areas
is also contained in the instruction manual for each
model which can be viewed on the BEKA website at
www.beka.co.uk
Each output pulse from a owmeter or ow transducer
representsadenedvolumethathaspassedthroughthe
owmeter.Thetotalnumberofpulsesthereforerepresents
the total volume and the pulse frequency represents the
rate of ow passing through the owmeter.   All BEKA
pulse input Rate Totalisers have similar functions and are
abletocalculateanddisplaythetotalowandtherateof
owofmostpulseoutputowmeters.
TheBEKARate Totaliserrangeincludeseldand panel
mounting models for general purpose applications and for
useingasanddusthazardousareas.Allmodelscanbe
suppliedwithawiderangeoffactoryttedoptionsincluding
display backlights, alarm outputs and isolated pulse and
current outputs for retransmission applications. Some
models have two pulse inputs enabling the instrument to
calculateanddisplaythesumordifferenceofthetotalow
andrateofowpassingthroughtwoowmeters.
All models are congured and calibrated via four push
buttons using a common conguration menu.  Although
easy to congure on-site without the need for test
equipment, Rate Totalisers can be supplied congured
and ready for installation with a printed slide-in scale card
showingcustomer speciedinformation forno additional
charge.
BEKA also manufacture loop powered 4/20mA Rate
Totalisers which have similar functions and are described
in a separate Application Guide.
APPLICATION GUIDE AG334
Externally powered pulse input Rate Totalisers
For models with an 'E' or 'G' suffix
associates

2
Field
GRP
141 x 212mm
IP66
Field
GRP
141 x 212mm
IP66
Enclosure
material, size
and IP rating
Model BA334E BA334G
Some shown with optional
backlight
Number of M20 cable entries
Separate terminal compartment Ye s
Display Primary: 8 digits 18mm high Secondary: 6 digits 12mm high
Number of inputs 1
Options - must be specified
when indicator is ordered
Backlight
Alarms
4/20mA output
Pulse output
Included
Included
Included
Included
Ye s
Ye s
Included
Ye s
BA384E
No Ye s No
3 2 3 2
2
Included
Included
Included
Included
Field
GRP
122 x 120mm
IP66
Field
GRP
122 x 120mm
IP66
BA384G
Ye s
Ye s
Included
Ye s
Certification Europe ATEX
Gas
Dust
Group II
Category 1GD
Ex ia IIC T5 Ga
-40°C ≤Ta ≤+70°C
Ex ia IIIC T80°C Da
-40°C ≤Ta ≤+60°C
Group II Category 1G
Ex ia IIC T5 Ga
-40°C ≤Ta ≤+70°C
N/A
Group II Category 1G
Ex ia IIC T5 Ga
-40°C ≤Ta ≤+70°C
Group II Category 1D
Ex ia IIIC T80°C Da
-40°C ≤Ta ≤+60°C
Group II Category 1G
Ex ia IIC T5 Ga
-40°C ≤Ta ≤+70°C
N/A
Certification International IECEx
Gas
Dust
Ex ia IIC T5 Ga
-40°C ≤Ta ≤+70°C
Ex ia IIIC T80°C Da
-40°C ≤Ta ≤+60°C
Ex ia IIC T5 Ga
-40°C ≤Ta ≤+70°C
N/A
Ex ia IIC T5 Ga
-40°C ≤Ta ≤+70°C
Ex ia IIIC T80°C Da
-40°C ≤Ta ≤+60°C
Ex ia IIC T5 Ga
-40°C ≤Ta ≤+70°C
N/A
Certification Canada cETL
Class I Div 1 Gp A, B, C, D T5
Class II Div 1 Gp E, F, G. Class III Div 1
Class I Zone 0 AEx ia IIC T5 Ga
-40°C ≤Ta ≤70°C
Class I Div 1 Gp A, B, C, D T5
Class II Div 1 Gp E, F, G. Class III Div 1
Ex ia IIC T5 Ga
-40°C ≤Ta ≤70°C
Certification USA ETL

3
Primary: 8 digits 18mm high Secondary: 6 digits 12mm high
BA384NG BA584G
No
2 2
Ye s
Ye s
Included
Ye s
Ye s
Ye s
Included
Ye s
BA334NG
1
Ye s
Ye s
Included
Ye s
Field
GRP
122 x 120mm
IP66
No
2
Field
GRP
122 x 120mm
IP66
BA534G
1
Ye s
Ye s
Included
Ye s
Ex ic codes only refer to
push button contacts
Not Certified
General purpose applications only
Group II Category 3G
Ex nA ic IIC T5 Gc
-40°C ≤Ta ≤+60°C
Group II Category 3D
Ex ic tc IIIC T80°C Dc
-40°C ≤Ta ≤+60°C
Ex nA ic IIC T5 Gc
-40°C ≤Ta ≤+60°C
Ex ic tc IIIC T80°C Dc
-40°C ≤Ta ≤+60°C
Class I Zone 2 AEx nA ic IIC T5 Gc
Zone 22 AEx ic tc IIIC T80°C Dc
-40°C ≤Ta ≤60°C
Ex nA ic IIC T5 Gc
Ex n IIC T5 Gc
Ex ic tc IIIC T80°C Dc
Class III Div 2 Class II Div 2 Gp F, G
-40°C ≤Ta ≤60°C
Table 1 Field mounting rate totalisers

4
Panel
Noryl
96 x 48 mm
Panel
Noryl
144 x 72 mm
Enclosure
material & size
Model BA337E BA338E
Some shown with optional
backlight
Protection
Display Primary: 8 digits 18mm high
Secondary: 6 digits 12mm high
Primary:
8 digits 9mm high
Secondary:
6 digits 6mm high
Primary:
8 digits 9mm high
Secondary:
6 digits 6mm high
Number of inputs 1 1
Options - must be specified
when indicator is ordered
Backlight
Alarms
4/20mA output
Ye s
#Ye s
]
Ye s
Ye s
Ye s
Ye s
BA388E
2
Front IP66, rear IP20
Ye s
Ye s
Ye s
Rugged panel
316 stainless steel
105 x 60 mm
BA337E-SS
Ye s
Ye s
Ye s
Certification Europe ATEX
Gas
Dust
Group II Category 1G
Ex ia IIC T5 Ga -40°C ≤Ta ≤+70°C
N/A
Group II Category 1G
Ex ia IIC T5 Ga
-40°C ≤Ta ≤+60°C
Group II Category 1D
Ex ia IIIC T80°C Da
-40°C ≤Ta ≤+60°C
*
Certification International IECEx
Gas
Dust
Ex ia IIC T5 Ga -40°C ≤Ta ≤+70°C
N/A
Ex ia IIC T5 Ga
-40°C ≤Ta ≤+60°C
Ex ia IIIC T80°C Da
-40°C ≤Ta ≤+60°C
*
Class I Div 1 Gp A, B, C, D T5
Class II Div 1 Gp E, F, G. Class III Div 1
Class I Zone 0 AEx ia IIC T5 Ga
-40°C ≤Ta ≤70°C
Class I Div 1 Gp A, B, C, D T5
Class II Div 1 Gp E, F, G. Class III Div 1
Ex ia IIC T5 Ga
-40°C ≤Ta ≤70°C
Certification Canada cETL
Zone 20 AEx ia IIIC
T80°C Da
-40°C ≤Ta ≤60°C
*
Ex ia IIIC T80°C Da
-40°C ≤Ta ≤60°C
*
Certification USA ETL
Pulse output Ye s Included Included Ye s
#
]
* May be installed in an Ex e, Ex p, Ex n or Ex t panel enclosure without invalidating enclosure certication.

5
Rugged panel
316 stainless steel
105 x 60 mm
Panel
Noryl
96 x 48 mm
Rugged panel
316 stainless steel
105 x 60 mm
Primary:
8 digits 9mm high
Secondary:
6 digits 6mm high
Primary:
8 digits 9mm high
Secondary:
6 digits 6mm high
Primary:
8 digits 9mm high
Secondary:
6 digits 6mm high
Primary: 8 digits 18mm high
Secondary: 6 digits 12mm high
BA537E BA588E
1 2
Ye s
Ye s
Ye s
Ye s
Ye s
Ye s
BA337NE
1
Ye s
Ye s
Ye s
Front IP66, rear IP20Front IP66, rear IP20
Panel
Noryl
144 x 72 mm
BA538E
Ye s
Ye s
Ye s
Ex ic codes only refer to
push button contacts
Group II Category 3G
Ex nA ic IIC T5 Gc
-40°C ≤Ta ≤+60°C
Group II Category 3D
Ex ic tc IIIC T80°C Dc
-40°C ≤Ta ≤+60°C
Ex nA ic IIC T5 Gc
-40°C ≤Ta ≤+60°C
Ex ic tc IIIC T80°C Dc IP66
-40°C ≤Ta ≤+60°C
Class I Zone 2
AEx nA ic IIC T5 Gc
Zone 22
AEx ic tc IIIC T80°C Dc
-40°C ≤Ta ≤60°C
Ex nA ic IIC T5 Gc
Ex n IIC T5 Gc
-40°C ≤Ta ≤60°C
BA537E-SS
Ye s
Ye s
Ye s
1
Ye s IncludedYe s Included Ye s
Not Certified
General purpose applications only
#
]
#
]
#
]
# Only one may be tted Table 2 Panel mounting rate totalisers

2. Selecting a model
When selecting a model the following requirements should
be considered:
Mounting Field or panel
Location Safe area
    GasHazardousarea
Zone 0, 1 or 2
Type of protection
     Certicationauthority
    Dusthazardousarea
Zone 20, 21 or 22
Type of protection
     Certicationauthority
Number of inputs 1or2owmeterinputs
Options Display backlight
Dual alarm outputs
Pulse output
4/20mA output
TosimplifyselectionTable1summarisesthespecications
of all the eld mounting Rate Totalisers and Table 2
contains similar information for the panel mounting
models.  Detailed specications, datasheets, instruction
manuals and third party safety and ingress certicates
for each model are available from the BEKA website
www.beka.co.uk.
2.1 Mounting
The BEKA range of pulse input Rate Totalisers includes
modelsforeldandpanelmounting.
2.1.1 Field mounting
Field mounting Rate Totalisers with a ‘G’ model number
sufx have a robust glass reinforced polyester (GRP)
enclosure with an 8mm thick toughened glass window.
The enclosure has IP66 ingress protection which will not
be degraded by 7J impacts to the GRP case or 4J impacts
to the window at temperatures between -40°C and +70°C.
The enclosure’s ingress and impact protection has been
independently assessed by a third party UKAS accredited
testhouse.Theresultingtestcerticateisshownonthe
BEKA website.
The enclosure material is carbon loaded to prevent the
accumulation of static charges. The thermoset GRP is
very strong and will not corrode or degrade when used
for Rate Totaliser installations in marine and waste water
environments.Forinstallationsinhazardousareas,GRP
overcomes the restrictions limiting the use of aluminium in
potentially explosive atmospheres.
Fieldmountinginstrumentswitha‘G’modelnumbersufx
have two M20 x 1.5 tapped cable entries. To maintain
the integrity of the Rate Totaliser enclosure both cable
entries should be tted with impact resistant M20 x 1.5
IP66 glands, conduit entries or blanking plugs.
The instrument’s units of measurement and tag information
can be marked onto a slide-in scale card clearly visible
aboveandbelowthedisplay.Althougheasytocongure
on-site, Rate Totalisers can be supplied congured and
calibrated with this scale card printed with customer
speciedunitsofmeasurementfornoadditionalcharge.
A 316 stainless steel legend plate which can be supplied
laser engraved with customer specied information is
available as an option.
Field mounting Rate Totalisers are surface mounting, but
can be be pipe or panel mounted using one of the BEKA
accessory kits.
BA393G 316 stainless steel kit, attaches instrument
toanyverticalorhorizontalpipewithoutside
diameter between 40 and 73mm.
BA394G 316 stainless steel panel mounting kit
secures eld mounting instrument into a
panel aperture, but does not seal panel
aperture.
BA494G GRP panel mounting kit secures eld
mounting instrument into a panel aperture
and provides IP66 seal between front and
rear of the panel.   Not certied for eld
mountinginstrumentswithan‘NG’sufx.
6

Inadditiontothe‘G’sufxIntrinsicallysafeeldmounting
models, ‘E’ sufx intrinsically safe Rate Totalisers are
also available.  The ‘E’ sufx models have a separate
eldterminalenclosureandthreetappedM20x1.5cable
entries. These models have display backlights, dual
alarms and isolated pulse and 4/20mA outputs.
2.1.2 Panel mounting
Panel mounting Rate Totalisers are available in 96 x 48mm
and144x72mmglassloadedNoryl(modiedPPE)DIN
enclosures with toughened scratch resistant glass display
windows.Theenclosuresizedependsuponthedisplay
sizeandthenumberofpulseinputs.Bothenclosureshave
IP66 front of panel ingress protection, and when correctly
installed provide an IP66 seal between the instrument
and the instrument panel. The ingress protection of
the enclosures have been independently assessed at
temperatures between -40°C and +70°C by a third party
UKASaccreditedtesthouse.Theresultingtestcerticate
is shown on the BEKA website.
The instrument’s units of measurement can be marked onto
a slide-in scale card clearly visible at the right hand side of
thedisplay.Thescalecardcanbettedwithoutopening
the instrument enclosure or removing the Rate Totaliser
fromtheinstrumentpanel.Although easytocongure
on-site, Rate Totalisers can be supplied congured with
the scale card printed with customer specied units of
measurement for no additional charge.
For panel mounting applications in marine environments,
or where the front of the instrument is likely to be impacted,
single input rugged models are available in a 316 stainless
steel enclosure.  These models, which are identied by
an‘-SS’ modelnumber sufx,have identicalfeatures as
the other models including a slide-in scale card. The
enclosure has IP66 front of panel ingress protection, and
when correctly installed provide an IP66 seal between
the instrument and the instrument panel. The ingress
protection of the enclosure has been independently
assessed at temperatures between -40°C and +70°C by a
third party UKAS accredited test house. The resulting test
certicateisshownontheBEKAwebsite.
IntrinsicallysafeRateTotaliserswithan‘-SS’sufxhave
beencertiedforinstallationinExeandExpenclosures
withoutinvalidatingthecerticationofthepanelenclosure
in which they are mounted.
For applications in Zone 2 or 22 without the need for Zener
barriers or galvanic isolators, the BA337NE Rate Totaliser
has Ex nA non-sparking and Ex tc dust ignition protection
by enclosure. Please see BEKA Application Guide AG310
for more information on how to install this Rate Totaliser.
The rear of panel ingress protection of all 96 x 48mm and
105 x 60mm rugged stainless steel Rate Totalisers can
be increased to IP66 with a BA495 rear cover sealing
kit. Manufactured from 316 stainless steel the cover
incorporates two M20 entries for cable glands, allowing
these Rate Totaliser s to be installed in open panels.
2.2 Location
Having decided how the Rate Totaliser is to be mounted,
the location of the installation will help to determine the
required model.
2.2.1 General purpose application
If the Rate Totaliser is to be installed in an area which does
nothaveaammablegasorcombustibledusthazard,one
of the following general purpose Rate Totaliser should be
selected.
Field mounting see Table 1
BA534G 1 input
BA538G 2 input
Panel mounting models are available in two alternative DIN
enclosuresizesplusaruggedimpactresistantinstrument
in a 316 stainless steel enclosure.
Panel mounting see Table 2
BA537E 1 input 96 x 48mm
BA538E 1 input 144 x 72mm
BA537E-SS 1 input Rugged 105 x 60mm
BA588E 2 input 144 x 72mm
2.2.2 Explosive atmosphere applications
ToselectaRateTotaliserforahazardousareainstallation,
the Zone or Division in which it is to be installed and
the hazard must be known, together with the required
certicationauthorityi.e.IECEx,ATEXorETL.
The range includes intrinsically safe Ex ia models for
installation in most gas and dust Zones. For installations
in Zone 2 or 22 without the need for Zener barriers or
galvanic isolators, models with non-sparking Ex nA
certicationforgashazardsanddustignitionprotectionby
enclosure Ex tc are included.
Field mounting see Table 1
BA334E 1 input 1G Ex ia Separate terminal
compartment.
BA334G 1 input 1GD Ex ia
BA384E 2 input 1G Ex ia Separate terminal
compartment.
BA384G 2 input 1GD Ex ia
BA334NG 1 input 3GD Ex nA and Ex tc
BA384NG 2 input 3GD Ex nA and Ex tc
Panel mounting see Table 2
BA337E 1 input 96 x 48mm 1G Ex ia
BA338E 1 input 144 x 72mm 1G Ex ia
BA337E-SS 1 input Rugged 105 x 60mm 1GD Ex ia
BA388E 2 input 144 x 72mm 1G Ex ia
BA337NE 1 input 105 x 60mm 3GD Ex nA
and Ex tc
7

When selecting a Rate Totaliser for installation in a
hazardousarea,theinstrument’shazardousareacerticate
should be consulted to ensure that the instrument has
approval for the required area, hazard and temperature
range.
2.3 Two input models
The two input Rate Totalisers are primarily intended for
use with two owmeters.  Each Rate Totaliser input is
individually congurable and the instrument can display
eitherinput,orthesumordifferenceofthetwoowrates
and totals.
Thetwoinputmodelsenablethetotalowandowrate
from two sources to be calculated and displayed. If it
is required to add more than two ow sources, multiple
Rate Totalisers can be linked using the instrument’s
synchronous pulse output.
2.4 Operating temperature
All the eld and panel mounting Rate Totalisers except
modelswithan‘E-SS’,‘NG’and‘NE’sufxhaveaspecied
operating temperature of -40°C to +70°C. Between these
temperatures the Rate Totalisers will function normally,
however at temperatures below -20°C the display digits
will gradually change more slowly and contrast will be
reduced. At some temperature below -20° the display will
stop functioning, but totalisation will continue normally and
the instrument will not be damaged.
Modelswithan‘E-SS’,‘NG’and‘NE’sufxhaveamaximum
certicationtemperatureof+60°Cbutperformanceisthe
same as the other models at low temperatures.
3. Rate Totaliser function
All BEKA externally powered pulse input Rate Totalisers
have similar functions, although the number of inputs and
the output options may differ.  Fig 1 shows a simplied
block diagram of a one input instrument.
All models can accept pulses from a wide variety of
owmeter transducers or outputs.   To enable a Rate
Totaliser to count pulses from transducers such as a
switch contact, open collector transistor or a two wire
proximity detector, the transducer has to be powered
whichisachievedbyttinganexternallinkbetweentwoof
theRateTotaliser’seldterminals.
1
2
3
4
5
6
RS1
RS2
Power
supply
A4
A3
A2
A1
Alarm
2
Alarm
1
+
+
Optional
isolated
alarms
C4
C3
C2
C1
+
Optional
isolated
4/20mA
output
Optional
backlight
internally
powered
Processor
Display
+
+
+
Link to
energise
input
Input
Pulse low
Pulse high
Magnetic pick-off
Proximity detector
Switch contact
Open collector
Isolated pulse output is optional on 96x48mm panel mounting models
External
reset
P2
P1
+
Earth
Isolated
pulse
output
Fig1SimplieddiagramofsingleinputRateTotaliser
RateTotaliserscancalculateanddisplaytherateofow
and the total ow from most pulse output owmeters
including non-linear owmeters such as a turbine meter
operatingoverawiderangeofows.Allmodelsinclude
a sixteen segment lineariser which can be congured
to minimise non-linearity errors. Rate Totalisers with
two inputs have separate conguration functions and a
separate lineariser for each input.
All the Rate Totaliser models have separate rate and total
displays as shown in Fig 2 with independent calibration
allowingtherateofowandthetotalowtobedisplayed
indifferentunitsofmeasurement.e.g.rateofowcould
beshowninlitresperhourandthetotalowcouldbein
cubic metres.  The display digit size depends upon the
model as shown below.
Display size
6 digits 8 digits
Field mounting
All models 12mm 18mm
Panel mounting
96 x 48mm 6mm 9mm
144 x 72mm 12mm 18mm
Rugged 105 x 60mm 6mm 9mm
8

Rateofowandtotalowmaybeshownoneitherthe6or
8 digit displays. If only one variable is required, the lower
six digit display may be disabled.
8 DIGITS
Total flow display
6 DIGIT
Rate of flow display
Alarm status annunciators
Flow symbol ‘rotates’ when
pulse input frequency exceeds 2Hz
Total and rate displays
may be reversed
Lower display may be
disabled
Fig 2 Rate Totaliser display
Thetotaldisplaymayberesettozerobyoperatingtwoofthe
Rate Totaliser’s push buttons, or remotely by connecting
the instruments external reset terminals together for more
than one second.
The Rate Totaliser also maintains a protected Grand Total
whichisnotresetwhenthetotaldisplayiszeroed.Both
the total display and the grand total are retained when the
Rate Totaliser is not powered.
4. Rate Totaliser Conguration
Allmodelsareconguredandcalibratedusingacommon
intuitive menu structured in the same way as all BEKA
instruments. The menu is accessed via the four instrument
pushbuttonsandcanbeprotectedbyauserdenedfour
digit access code. The calibration structure of all single
input Rate Totalisers is shown in Fig 3. This allows a Rate
Totaliser to be congured and calibrated on-site without
the need for external test equipment.
The conguration menu uses English language names
to describe functions and variables such as code and
debounce. When the function name has more than eight
characters a simple abbreviation is used such as di5p-1
(Display1)andt-re5et(Totalreset).InthisApplication
Guide these function and variable names are shown in a
seven segment font, exactly as they appear on the Rate
Totaliser’s display.
BEKA rate Totalisers are easy to calibrate as there are
only four basic variables to adjust.
Flowmeter K-factor factor
Total scale factor 5cale t
Rate scale factor 5cale r
Timebase t-ba5e
Therstthreevariables,factor, 5cale t and 5cale r divide
thenumberofinputpulsesfromtheowmetertoconvertthem
to meaningful engineering units, such as gallons or litres. As
showninFig3theyarearrangedsothatthetotalowand
therateofowcanbeshownindifferentengineeringunits.
Each variable is adjustable between 0.0001 and 99999 and
is described separately in the following sections.
Pulse input
÷
Flowmeter K factor FACtor
Dividing factor usually adjusted
to equal flowmeter K-factor.
Adjustable between
0.0001 and 99999
Note: When the 16
segment lineariser Lin is
selected in the Function menu
up to 16 values of FACtor
may be entered each starting
at a specified pulse frequency
÷
Rate scale factor 5CALE . r
Dividing factor to convert pulse
output from FACtor into the
required units for the rate display
Adjustable between
0.0001 and 99999
X
Timebase t-bA5E
÷
Total scale factor 5CALE . t
Dividing factor to convert pulse
output from FACtor into the
required units for the total display
Adjustable between
0.0001 and 99999
Total display
Grand Total 8 high & 8 low digits
1 for rate per second
60 for rate per minute
3,600 for rate per hour
Rate display
888888
88888888
88888888 88888888
Fig3SingleinputRateTotaliserCongurationstructure
4.1 Flowmeter K-factor
Each output pulse from a owmeter or ow transducer
representsadenedowvolumethathaspassedthrough
theowmeter.Formostowmetersthisissmallcompared
withthe total owvolume that isto bemeasured. The
performance of owmeters and ow transducers is
therefore dened by the number of output pulses  they
produceforeachunitofowvolumepassingthroughthem
e.g.200pulsespergallonofow.Thisisknownasthe
K-factorofthemeterortransducer.Mostowmetersand
transducersaresuppliedwithatestcerticateshowingthe
averageK-factoroverarangeofowrates.
To convert the pulse output from a owmeter or ow
transducer into engineering units, the number of output
pulsesmustbedividedbytheK-factoroftheowmeteror
owtransducer.
9

4.2 Total Scale Factor 5cale . t
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 . tis
included.
5CALE . tis 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 5 illustrates how 5CALE . tcan be used to extend the
example shown in Fig 4 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 . r
Set to 4.5461
÷
Total scale factor 5cale . t
Set to 1000
x
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
meter m³ of flow
Fig 5 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 3.
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 4.
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 10.1 contains additional
information about Rate Totaliser resolution.
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 . r
Set to 4.5461
÷
Total scale factor 5cale . t
Set to 1000
x
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
meter of flow
Fig 4 factorsettoowmeterK-factor
10

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 . r
Set to 4.5461
÷
Total scale factor 5cale . t
Set to 1000
x
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
meter of flow
Fig 6 5cale . rand t-ba5e set to provide a Rate Display
in Gallons / minute
4.4 Timebase: t-bA5E
As described in the previous section, the rate scale factor
5cale . rdenestheengineeringunitsoftheratedisplay.
TheRateTotalisercandisplayrateofowpersecond,per
minute or per hour.
The Rate Totaliser timebase t-ba5e enables the output
from 5cale . rto be multiplied by 1, 60 or 3,600 to produce
a rate display per second, per minute or per hour as shown
below:
t-ba5e menu
options
tb-1 x1forow/second
tb-60 x60forow/minute
tb-3600 x3600forow/hour
For this example the rate display is required in gallons per
minute, therefore t-ba5e is set to tb-60 as shown in Fig 6.
4.3 Rate scale factor 5cale . r
Function 5CALE . ris similar to 5cale t described in the
previous section. As shown in section 4.1 the Rate
Totaliser function factor is used to convert the number of
inputpulsesreceivedfromtheowmeterintoengineering
units such as litres or gallons.
If the Rate Totaliser’s rate display is required in the
engineering units produced by factor no further scaling
is required. However, to enable the rate 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 . ris
included.
Functions 5cale . rand 5cale . treceive their inputs from
factor. Both are independently adjustable which enables
the Rate Totaliser to have rate and total displays with
different units of measurement.
5cale . ris a dividing factor adjustable between 0.0001
and99999thatenablesrateofowtobedisplayedinthe
required engineering units. It is used in conjunction with
the Rate Totalisers timebase t-ba5e which determines
whethertheowrateisdisplayedpersecond,perminute
or per hour.
Continuing the example shown in Fig 4 and assuming
thattheowratedisplayisrequiredingallonsperminute.
Fig 6 illustrates how 5cale . ris set to produce a rate
display in gallons. Each pulse output from the factor
functionrepresentonelitreoftotalow.Thereare4.5461
litres in an imperial gallon, therefore the output from factor
requires dividing by 4.5461 to convert it to imperial gallons.
This is achieved by setting 5cale . rto 4.5461.
4.3.1 Resolution
The output from factor will determine the resolution of
the Rate Totaliser.   If increments of ow smaller than
oneK-factorunitofmeasurementaresignicant,factor
should be reduced.
The effect of reducing factor for a owmeter having a
K-factor of 200 pulses per litre are shown below.
Factor Instrument resolution
200 1 litre
20 0.1 litre
2 0.01 litre
TOTAL
________
RATE
BA337E
6501
50 . 0
Total and Rate are displayed simultaneously and can
have different units of measurements
11

5 Linearisation
Flowmeters are usually supplied with a calibration
certicate specifying their average K-factor and the ow
rangeoverwhichitapplies.Foruseoverextendedow
ranges and for non-linear owmeters, multiple K-factors
willbespeciedeachatadifferentowrate.Forthese
devicesthecalibrationcerticateislikelytocontainatable
similar to the one shown below.
Flow Rate
Litres/min
K-factor
Pulses/litre
5 200
10 230
15 239
20 242
Table3Typicalowmetercalibrationcerticate
To minimise display errors resulting from owmeter
non-linearity, all BEKA Rate Totalisers incorporate a 16
segment straight line lineariser which when correctly
conguredwillcompensatefortheowmeternon-linearity.
When the Rate Totaliser’s lineariser is enabled up to
16 values of the owmeter’s K-factor may be entered in
the l-factor function, each at a specied input pulse
frequency pul5e fre.
Theoutputfrequencyoftheowmeter,whichisrequiredfor
calibrating the Rate Totaliser lineariser, can be calculated
fromtheinformationintheowmetercalibrationcerticate.
OutputfrequencyHz=(Flowratepermin)x(K-factor)
60
Oriftheowrateisspeciedpersecond.
OutputfrequencyHz=(Flowratepersecond)x(K-factor)
Flow Rate
Litres/min
K-factor
Pulses/litre
Output
frequency
Hz
000
5 200 16.666
10 230 38.333
15 239 59.750
20 242 80.666
Table 4 Calculated lineariser calibration information
6 Pulse output
AlleldmountingBEKARateTotalisersandthe144x72mm
panel mounting models have an optically isolated open
collector pulse output. This pulse output is available as
afactoryttedoptionforthesmaller96x48mmandthe
rugged 105 x 60mm panel mounting models.
The output pulse may be a synchronous duplicate of the input
pulse for re-transmission applications, or it may be derived
fromincrementationoftheleastsignicantdigitofthetotal
display, irrespective of the decimal point position. When
derived from the total display the output pulse frequency
maybedividedandtheoutputpulsewidthdened.
Selecting dirECtin thepulseoutput congurationmenu
produces a synchronous duplicate of the Rate Totaliser
inputpulseatfrequenciesupto5kHz.
When 5CALEdisselectedinthepulseoutputconguration
menu, the pulse output is derived from the incrementation
oftheleastsignicantdigitofthetotaldisplay,irrespective
of the position of the displayed decimal point. When
5CALEd is selected the Rate Totalisers pulse output
frequency may be divided by:
1
10
100
1000
10000
and the pulse output width (duration) may be selected
from eleven options:
0 . 1 ms
0 . 5 ms
1 ms
2 . 5 ms
5 ms
10 ms
25 ms
50 ms
100 ms
250 ms
500 ms
If congured such that the output pulse frequency with
the specied pulse width can not be output in real time,
the number of pulses will be stored and transmitted at
the maximum possible speed, but will not be stored if
the total display is reset to zero or the Rate Totaliser is
disconnected or switched off.
To prevent misleading or dangerous pulse outputs after
anychangesaremadetotheRateTotaliserconguration,
the pulse output must be manually re-enabled before it will
function.
The pulse output of a two input Rate Totaliser may be a
synchronous duplicate of either pulse input, or it may be
derivedfromincrementationoftheleastsignicantdigitof
thecompositetotaldisplay(inputA+inputb)irrespective
of which total is being displayed by the instrument.
A pulse output can not be derived from a composite total
displayof(inputA-inputb).
12

7. Optional 4/20mA output
All BEKA Rate Totalisers can be supplied with a factory
ttedgalvanicallyisolated4/20mAcurrentsinkoutputwhich
can be used for retransmission to other instrumentation.
This output appears as a 4/20mA loop powered transmitter
requiring an external power supply between 5 and 28V.
Theoutputcanbeconguredtorepresentanypartofthe
instrument’s rate or total display.
To prevent a misleading or dangerous current output
afteranychangestotheRateTotaliserconguration,the
4/20mA output must be manually re-enabled before it will
function.
8. Optional dual Alarm outputs
All BEKA Rate Totalisers can be supplied with factory
tteddualalarms.Eachalarmhasagalvanicallyisolated,
solid state single pole, voltage free output that may be
independently congured as a high or low, rate or total
alarm with a normally open or normally closed output.
Congurablefunctionsforeachalarmincludethesetpoint,
alarm delay and silence time. Hysteresis may be applied
to rate alarms.
When the Rate Totaliser’s power supply is turned off
or disconnected, alarm outputs will open irrespective
of whether normally open or normally closed outputs
have been selected. When designing a system it is
recommended that an open output should be selected for
the alarm condition.
Alarm annunciators on the instrument display indicate the
status of each alarm. If an alarm delay or silence time has
beenselectedtheannunciatorwillashduringthedelay
or silence period.
9. Slide-in scale card
All Rate Totaliser’s, except the ‘E’ sufx eld mounting
models, have a slide-in scale card which can be printed
to show the instruments units of measurement. The scale
cardismountedonaexiblestripthatisinsertedintoaslot
at the rear of panel mounting Rate Totalisers and adjacent
totheterminalsoneldmountinginstruments.
New Rate Totalisers can be supplied with a printed scale
card showing requested units of measurement for no
additional charge. If this information is not supplied when
theinstrumentisorderedablankcardwillbettedwhich
can easily be marked on-site.
Inserting scale card in panel Rate Totaliser
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Example 2
This example illustrates a Rate Totaliser with the rate and
totaldisplayshavingdifferentengineeringunits.Totalow
isrequiredinm³witharesolutionof0.1andtheowrate
in litres per Minute with a resolution of 1.
Anoutputpulseisrequiredforeach0.1m³oftotalow.
TheowmeterhasaK-factorof1pulseperlitre.
Summary
Flowmeter K-factor 1 pulse / litre
Required total display 0.0 m³
Required rate display 0 litres / minute
 Pulseoutput  1pulse/0.1litresofow
Rate Totaliser Conguration
Flowmeter K-factor
Factor 1
Eachoutputpulsefromtheowmeterrepresents1litre
therefore no further conversion is required.
Total display
5cale t 1000
dp total 0 . 0
Display is required in m³, therefore 5cale t is set to 1000
as there are 1000litres in a m³. Total display resolution
of 0.1 m³ is required, hence decimal point is positioned
beforetheleastsignicantdigit.
Rate display
5cale r 1 . 0
dp rate 0
t-ba5e tb-60
Display is required in litres / minute. Each pulse already
represents 1 litre so no further scaling is required and
5cale r is set to 1.0 Rate display resolution of 1 litre
is required, hence decimal point is positioned after the
leastsignicantdisplaydigit where it is not visible .
Selecting a timebase of tb-60 multiplies the rate display
by60toshowtheowrateperminute.
Pulse output
5ource 5caled
divide 1
The Rate Totaliser outputs a pulse each time the least
signicantdigitofthetotaldisplayisincremented.The
leastsignicantdigitofthetotaldisplayrepresents0.1
m³ which is the required output pulse resolution,therefore
no further division is required.
10. Conguration examples
This section contains some examples of Rate Totaliser
congurations requested by BEKA customers.  Step-by-
step instructions are not included nor are non-calibration
congurationfunctions.
Example 1
In this example a user required a BEKA Rate Totaliser to
displaytotalowinGallonswitharesolutionof0.1andthe
owrateinGallonsperMinutewitharesolutionof1.
Anoutputpulseisrequiredforeachgallonoftotalow.
TheowmeterhasaK-factorof10pulsesperGallon.
Summary
Flowmeter K-factor 10 pulses / gallon
Required total display 0.0 gallons
Required rate display 0 gallons / minute
 Pulseoutput  1pulse/1gallonofow
Rate Totaliser Conguration
Flowmeter K-factor
Factor 10 . 0
Converts output from owmeter into engineering units
gallons.
Total display
5cale t 1 . 0
dp total 0 . 0
Display is required in gallons, therefore 5cale t is set to 1
as Factor has converted pulse input into gallons. Total
display resolution of 0.1 gallons is required, hence decimal
pointispositionedbeforetheleastsignicantdigit.
Rate display
5cale r 1 . 0
dp rate 0
t-ba5e tb-3600
Display is required in gallons, therefore 5cale r is set to 1
as Factor has converted pulse input into gallons. Rate
display resolution of 1 gallon is required, hence decimal
point is positioned after least signicant display digit
where it is not visible.
Selecting a timebase of tb-60 multiplies the rate display
by60toshowowrateperminute.
Pulse output
5ource 5caled
divide 10
The Rate Totaliser outputs a pulse each time the least
signicantdigitofthetotaldisplayisincremented.The
leastsignicantdigitrepresents0.1gallonssothisrate
has to be divided by 10 to produce one output pulse per
gallonoftotalow.
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Example 3
The requirements of this example are identical to those for
example 2 except for the pulse output. In this example an
outputpulseisrequiredforeachlitreofow.whichisthe
sameasthatbeingproducedbytheowmeter.
Pulse output
5ource direct
The required output pulse from the Rate Totaliser is the
sameaspulseoutputfromtheowmeteri.e.1pulseper
litre. Selecting direct inthepulseoutputconguration
menu, results in the output pulse being a synchronous
duplicate of the Rate Totaliser input pulse.
Example 4
This example illustrates how a Rate Totaliser can display
totalowand therateofowfromastroke sensorona
reciprocating pump.
Adisplayofthetotaloilowisrequiredinbarrelsofoilwith
a resolution of 0.1. The Rate Totaliser is also required to
display the pump stroke rate in pump strokes per Minute.
Anoutputpulseisrequiredforeachbarreloftotalow.
Each pulse from the pump represent one stroke which is
equivalent to 0.6247 US Gallons.
Summary
Flowmeter K-factor 1 pulse / 0.6247 USG
Required total display 0.0 Barrels
Required rate display 0 Strokes / minute
Pulse output 1 pulse / Barrel
Rate Totaliser Conguration
Flowmeter K-factor
Factor 1 . 0
Each output pulse from the pump represents 1 stroke
therefore no further conversion is required.
Total display
5cale t 67 . 232
dp total 0 . 0
The display is required in Barrels, therefore 5cale t has
to convert pump strokes to Barrels.
Each pump stroke displaces 0.6247 US Gallons and
there are 42 US Gallons in a barrel.
5Cale t = 42 / 0.6247 = 67.232
Total display resolution of 0.1 barrels is required, hence
decimal point is positioned before the least signicant
digit of the display.
Rate display
5cale r 1. 0
dp rate 0
t-ba5e tb-60
Display is required in pump strokes / minute. Each
pulse already represents 1 pump stroke so no further
scaling is required and 5cale r is set to 1. Rate display
resolution of 1 Stroke is required, hence decimal point
ispositionedafterleastsignicantdisplaydigit where it
is not visible .
Selecting a timebase of tb-60 multiplies the rate display
by 60 to show pump strokes rate per minute.
Pulse output
5ource 5caled
divide 10
The Rate Totaliser outputs a pulse each time the least
signicantdigitofthetotaldisplayisincremented.The
leastsignicantdigitrepresents0.1barrelssothisrate
has to be divided by 10 to produce one output pulse per
barreloftotalow.
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Example 5
This example illustrates how a BEKA two input Rate
Totaliser can be used to display the rate of ow and
the total ow of two reciprocating mud pumps and their
composite rates and totals i.e. pump 1 + pump 2. Each
pump has a displacement of 1 litre per stroke and a sensor
outputs one pulse per stroke.
The rate display is required in pump strokes per minute
and the total mud ow is to be displayed in m³ with a
resolution of 0.1 m³. Operating the Rate Totalisers front
panel *or &push button while the instrument is
functioning scrolls the display through pump 1, pump 2 or
the composite output of both pumps, but it does not affect
the instruments performance or output.
A pulse is to be transmitted by the Rate Totaliser for each
0.1 m³ of composite mud pumped i.e. pump 1 + pump 2.
Summary
Pump K-factor 1 pulse / stroke which is
equivalent to 1 litre.
Required total display 0.0 m³
Required rate display 0 strokes / minute
Pulse output 1 pulse / 0.1m³ of composite
     totalow.
Rate Totaliser Conguration
K-factor
FACtor-A pump 1 1 . 0
FACtor-b pump 2 1 . 0
Each output pulse from pump 1 and pump 2 represents
1strokewhichisequivalentto1litreofowthereforeno
further conversion is required.
Total display
5CALE . t-A 1000
5CALE . t-b 1000
The display is required in m³, therefore 5CALE . thas to
convert litres to m³. Each pump stroke displaces 1 litre
and there are 1000 litres in each m³.
Rate Display
5CALE . r-A 1
5CALE . r-b 1
dP rAtE 0
t-bA5E tb-60
The rate display is required in strokes per minute. Each
pulse from pumps 1 and 2 represents 1 pump stroke so
no further scaling is required for either input. Therefore
both 5CALE . r-A and 5CALE . r-b are set to 1. Rate display
resolution of 1 stroke is required, hence decimal point is
positionedaftertheleastsignicantdisplaydigitwhere
it is not visible. Selecting a timebase of tb-60 multiplies
the rate display by 60 to show pump stroke rate per
minute.
Pulse output
5ourCE 5CALEd
diVidE 1
An output pulse is required for each composite 0.1 m³ of
mud pumped. The Rate Totaliser outputs a pulse each
timetheleastsignicantdigitofthecompositetotal(pulse
inputA+pulseinputb)isincremented,irrespectiveof
whether the composite total is being displayed. In this
exampletheleastsignicantdigitofthecompositetotal
represents 0.1m³ so scaling is not require.
However, if an output pulse was required for every 1.0m³
of composite total that was pumped, diVidE would have
to be set to 10 i.e. 10incrementsoftheleastsignicant
digit(0.1m³perincrement)wouldoccurbeforeanoutput
pulse was produced.
11. Additional information
If additional information or help is required with Rate
Totaliser conguration, please call one of our sales
engineers who will be pleased to help.
Although Rate Totalisers are easy to congure on-site,
they can be supplied congured to customer specied
requirements with a printed slide-in scale card for no
additional charge.
BEKA associates Ltd.
Old Charlton Road., Hitchin, Herts. SG5 2DA UK Tel: [phone] Fax: [phone] e-mail [email protected] www.beka.co.uk
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