User Guide

ManualsBrandsBEKA ManualsRate TotalizerBEKA AG334 Externally Powered Pulse Input Rate Totalizer

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

Summary of content (16 pages)

PAGE 1
APPLICATION GUIDE AG334 associates Externally powered pulse input Rate Totalisers For models with an 'E' or 'G' suffix 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 configuration 4.1 Flowmeter K-factor 4.2 Total scale factor 4.3 Rate scale factor 4.3.1 Resolution 4.
PAGE 2
Model BA334E BA334G BA384E BA384G Some shown with optional backlight Enclosure material, size and IP rating Number of M20 cable entries Separate terminal compartment 3 2 3 2 Yes No Yes No Display Primary: 8 digits 18mm high Secondary: 6 digits 12mm high Number of inputs Certification Certification Field GRP Field GRP Field GRP 122 x 120mm IP66 141 x 212mm IP66 122 x 120mm IP66 Field GRP 141 x 212mm IP66 2 1 International IECEx Gas Ex ia IIC T5 Ga -40°C ≤ Ta ≤ +70°C Ex ia IIC T5 G
PAGE 3
BA384NG BA334NG BA584G BA534G Field GRP 122 x 120mm IP66 Field GRP 122 x 120mm IP66 2 No No Primary: 8 digits 18mm high Secondary: 6 digits 12mm high 2 1 2 1 Ex nA ic IIC T5 Gc -40°C ≤ Ta ≤ +60°C Ex ic tc IIIC T80°C Dc -40°C ≤ Ta ≤ +60°C 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 ic codes only refer to push button contacts Not Certified General purpose applications
PAGE 4
Model BA337E BA338E BA388E BA337E-SS Some shown with optional backlight Enclosure material & size Panel Noryl 96 x 48 mm Front IP66, rear IP20 Protection Display Primary: 8 digits 9mm high Secondary: 6 digits 6mm high Number of inputs Certification Certification Primary: 8 digits 18mm high Secondary: 6 digits 12mm high 2 1 Primary: 8 digits 9mm high Secondary: 6 digits 6mm high 1 International IECEx Gas Ex ia IIC T5 Ga -40°C ≤ Ta ≤ +70°C Ex ia IIC T5 Ga -40°C ≤ Ta ≤ +60°C Dust N/A E
PAGE 5
BA337NE BA537E Rugged panel 316 S/S 105 x 60 mm Panel Noryl 96 x 48 mm BA537E-SS Rugged panel 316 S/S105 x 60 mm Panel Noryl 144 x 72 mm Front IP66, rear IP20 Primary: 8 digits 9mm high Secondary: 6 digits 6mm high BA588E BA538E Front IP66, rear IP20 Primary: 8 digits 9mm high Secondary: 6 digits 6mm high Primary: 8 digits 18mm high Secondary: 6 digits 12mm high 1 1 2 Primary: 8 digits 9mm high Secondary: 6 digits 6mm high 1 Ex nA ic IIC T5 Gc -40°C ≤ Ta ≤ +60°C Ex ic tc IIIC T80°C Dc IP6
PAGE 6
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 Certification authority Dust hazardous area Zone 20, 21 or 22 Type of protection Certification authority Number of inputs 1 or 2 flowmeter inputs Options Display backlight Dual alarm outputs Pulse output 4/20mA output Field mounting instruments with a ‘G’ model number suffix have two M20 x 1.
PAGE 7
BA494G GRP panel mounting kit secures field mounting instrument into a panel aperture and provides IP66 seal between front and rear of the panel. Not certified for field mounting instruments with an ‘NG’ suffix. TAG NUMBER Intrinsically safe Rate Totalisers with an ‘-SS’ suffix have been certified for installation in Ex e and Ex p enclosures without invalidating the certification of the panel enclosure in which they are mounted at temperatures between -40°C and +60°C.
PAGE 8
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 certification authority i.e. IECEx, ATEX or ETL. 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 5 shows a simplified block diagram of a one input instrument.
PAGE 9
Rate of flow and total flow 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.
PAGE 10
This can be illustrated with a simple example. To calculate the total flow in engineering units measured by a flowmeter 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 configurable dividing constant called factor which can be adjusted between 0.0001 and 99999 as shown in Fig 7.
PAGE 11
4.3 Rate scale factor 5cale . r Function 5CALE . r is 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 flowmeter 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.
PAGE 12
5 Linearisation Flowmeters are usually supplied with a calibration certificate specifying their average K-factor and the flow range over which it applies. For use over extended flow ranges and for non-linear flowmeters, multiple K-factors will be specified each at a different flow rate. For these devices the calibration certificate is likely to contain a table similar to the one shown below.
PAGE 13
7. Optional 4/20mA output All BEKA Rate Totalisers can be supplied with a factory fitted 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 configured to represent any part of the instrument’s rate or total display.
PAGE 14
10. Configuration examples This section contains some examples of Rate Totaliser configurations requested by BEKA customers. Step-bystep instructions are not included nor are non-calibration configuration functions. Example 2 This example illustrates a Rate Totaliser with the rate and total displays having different engineering units. Total flow is required in m³ with a resolution of 0.1 and the flow rate in litres per Minute with a resolution of 1.
PAGE 15
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 flow. which is the same as that being produced by the flowmeter. Pulse output 5ource direct The required output pulse from the Rate Totaliser is the same as pulse output from the flowmeter i.e. 1 pulse per litre.
PAGE 16
Example 5 This example illustrates how a BEKA two input Rate Totaliser can be used to display the rate of flow and the total flow 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 flow is to be displayed in m³ with a resolution of 0.1 m³.