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Fig  16  shows  a  typical  application  in  which  a
BA334NG  Rate  Totaliser  is  mounted  in  Zone 2  is
displaying the output from a Flameproof Ex d 2-wire
flowmeter located in Zone 1.    Alarm 1 is switching
an Ex e sounder in Zone 1 and alarm 2 is switching
a sounder located in the safe area.

Fig 16 Typical alarm application

(Shown without recommended screened cables)

To comply with the requirements of EN 60079-14

Electrical installations design, selection and
erection

, each of the wires entering the hazardous

area  should  be  individually  fused  and  contain  a
means  of  isolation.    These  two  requirements  are
frequently satisfied by using fuse holders with easily
removable fuses and removing the fuses to achieve
isolation.  This is a satisfactory method at the low
voltages  and  currents  common  in  instrumentation
systems. Clear identification of, and easy access to
the means of isolation is essential for their effective
use.  It  is  also  necessary  to  ensure  that  the
maintenance  procedure  makes  sure  that
unauthorised  re-closure  of  the  switches  does  not
occur.  It  is  not  considered  necessary  to  have  a
means  of  isolation  or  electrical  protection  for  the
screen.   Fig 2 illustrates an example of this type of
fused terminal block.

For  some  applications  Ex nA  instrumentation
energised  by  a  current  limited  power  supply  or
instrument  that  can  be  switched  off,  is  often
considered  adequate  and  to  comply  with  the
requirements of the standard.

10.3.3 Configuration and adjustment

When  a  BA334NG  Rate  Totaliser  is  fitted  with
alarms  the  configuration  menu  is  extended  as
shown in  Fig 17.   Each alarm may be configured
to operate on the rate or total display.

For simplicity Fig 17 only shows the configurable
functions on the rate option of alarm

AL1

, the total

option is identical except that total alarms do not
have hysteresis. Alarm

AL2

is identical to alarm

AL1

.

The following table summarises each of the alarm
configuration functions and includes a cross
reference to more detailed information. Again only
alarm

AL1

functions are listed.

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Содержание BA334NG

Страница 1: ...Issue 5 9th July 2019 BA334NG Ex nA and Ex tc Externally powered Rate Totaliser Issue 5 ...

Страница 2: ...te interval update 6 9 Upper display di5p 1 6 10 Lower display di5p 2 6 11 Position of decimal points dp 6 12 Flowmeter K factor factor 6 13 Total scale factor 5cale t 6 14 Rate scale factor 5cale r 6 15 Timebase t ba5e 6 16 Display filter filter 6 17 Clip off clp off 6 18 Local reset loc clr 6 19 Local total reset clr tot 6 20 Local grand total reset clr gtot 6 21 Grand total reset from configura...

Страница 3: ... 10 3 7 Alarm function hi lo 10 3 8 Alarm output status no nc 10 3 9 Hysteresis h5tr 10 3 10 Alarm delay dela 10 3 11 Alarm silence time 5il 10 3 12 Flash display fl5h 10 3 13 Access setpoint ac5p 10 3 14 Adjusting alarm setpoints from totalisation mode 10 4 4 20mA output 10 4 1 Ex nA certification 10 4 2 Configuration 10 4 3 4 20mA output 4 20op 10 4 4 Enable 4 20mA output enbl 10 4 5 Select rate...

Страница 4: ...For international applications the BA334NG also has IECEx certification which is described in Appendix 2 For applications in the USA and Canada the BA334NG has ETL and cETL approval see Appendix 3 2 OPERATION Fig 1 shows a simplified block diagram of the BA334NG Rate Totaliser The instrument can accept pulses from most flowmeter transducers When connected to a pulse output flowmeter the BA334NG wi...

Страница 5: ...l If Local Grand Total Reset CLr Gtot in the instrument configuration menu has been activated operating the and buttons for ten seconds will result in Clr no being displayed with the no flashing Operating the or button will change the display to CLr YE5 the button will then reset the grand total to zero which will be confirmed by a brief display of Gt Clrd See 6 20 If Local Total Reset CLr tot in ...

Страница 6: ...nd Certification Ltd have issued the BA334NG with a Type Examination Certificate number ITS16ATEX48409X This has been used to confirm compliance with the European ATEX Directive for Group II Category 3G equipment The instrument carries the Community Mark and subject to local codes of practice may be installed in any of the European Economic Area EEA member countries and in the EEA EFTA states Icel...

Страница 7: ...A This allows the BA334NG to be powered from any dc supply which in normal operation has an output of less 30V and 100mA See section 4 1 for power supply recommendations 3 6 Pulse input The BA334NG Rate Totaliser has a single pair of pulse input terminals 5 and 6 that may be configured for use with different types of sensor For sensors that require energising to determine their state such as switc...

Страница 8: ...em it is important to remember that terminals 2 6 and RS2 are interconnected within the BA334NG See Fig 1 4 1 Power supply The BA334NG Rate Totaliser requires a minimum of 10V between terminal 1 2 and consumes 10mA without optional backlight plus 6mA when terminals 3 4 are linked plus 16mA with optional backlight A 24V dc regulated current limited supply located in a safe area is suitable The powe...

Страница 9: ...liable totalisation the Rate Totaliser pulse input must fall below the lower threshold and rise above the upper thresholds shown in the following table Input transducer Switching thresholds Lower Upper Open collector 2kΩ 10kΩ Voltage pulse low 1 0V 3 0V Voltage pulse high 3 0V 10 0V Magnetic pick off 0mV 40mV peak Proximity detector 1 2mA 2 1mA Switch 100Ω 1000Ω Flowmeters with a switch contact pr...

Страница 10: ... withstand a 500V rms insulation test to earth The BA334NG contains a configurable debounce circuit to prevent false triggering See section 6 7 4 2 6 Voltage pulse input Two voltage pulse input ranges are selectable in the BA334NG Rate Totaliser configuration menu VoLt5 L and VoLt5 H The Rate Totaliser input terminals 5 and 6 may be connected to any Zone 2 certified voltage pulse output flowmeter ...

Страница 11: ... may be pipe mounted using a BA393G pipe mounting kit or panel mounted using a BA394G or BA395G panel mounting kit 5 2 Installation Procedure Fig 6 illustrates the instrument installation procedure A Remove the Rate Totaliser assembly by unscrewing the four captive A screws B Mount the enclosure back box on a flat surface and secure with screws or bolts through the four B holes Alternatively use o...

Страница 12: ... the instrument is ordered a blank scale card will be fitted which can easily be marked on site with a dry transfer or a permanent marker Custom printed scale cards are available from BEKA associates as an accessory To remove the scale card from a Rate Totaliser carefully pull the transparent tab at the rear of the instrument assembly away from the assembly as shown in Fig 8a Fig 8a Removing scale...

Страница 13: ...eing configured totalisation continues so that any flow occurring during this time is recorded 6 1 Configuration structure Fig 9 shows the BA334NG calibration structure The rate and total display calibrations are independent which allows the displays to have different engineering units The rate totaliser pulse input is divided by FACtor which is usually set to the K factor of the flowmeter thus co...

Страница 14: ...configuration menu is shown diagrammatically in Fig 10 When returning to the totalisation mode following reconfiguration the Rate Totaliser will display dAtA followed by 5AVE while the new information is stored in permanent memory 6 3 Summary of configuration functions This section summarises all the configuration functions When read in conjunction with Fig 10 it provides a quick aid for configuri...

Страница 15: ...mber of litres in 1 000 imperial gallons 5CALE t may be adjusted between 0 0001 and 99999 The total flow display is independent of the rate display See section 6 13 Display Summary of function 5CALE r Rate scale factor 5CALE r is a dividing factor that converts the pulse output from FACtor into the required rate display in engineering units e g if the output from FACtor is one pulse per litre and ...

Страница 16: ...be restored See section 6 20 Display Summary of function CLr Gtot Reset grand total from configuration menu This function resets the grand total to zero from within the configuration menu when CLr YE5 is selected and 5urE is entered to confirm the instruction Note Once reset the grand total can not be recovered See section 6 21 CodE Security code Defines a four digit alphanumeric code which must b...

Страница 17: ...ounCE which configure the Rate Totaliser input and input noise rejection 6 6 Input type inP tYPE inP tYPE is a sub menu in the inPut function which defines the type of flowmeter or input pulse that the Rate Totaliser will count To check or change the type of input select inPut in the main configuration menu and press which will reveal the inP tYPE prompt pressing again will show the Rate Totaliser...

Страница 18: ...18 ...

Страница 19: ...19 ...

Страница 20: ...the or button will scroll through the three levels When the required level has been selected pressing twice will enter the selection and return the display to the inPut prompt in the configuration menu 6 8 Display update interval uPdAtE If either the rate or the total display is likely to change rapidly a longer interval between display updates may simplify reading the Rate Totaliser display This ...

Страница 21: ...fer control to the decimal point that may be positioned between any of the digits or may be omitted by moving it to the right of the least significant digit When set as required press to return to the FACtor prompt in the configuration menu 6 13 Total scale factor 5CALE t 5CALE t is a dividing factor adjustable between 0 0001 and 99999 that enables total flow to be displayed in the required engine...

Страница 22: ...le rate display stability and a fast response to a large rate signal change To check or change the filter select FiLtEr in the configuration menu and press which will reveal the existing settings with the first digit flashing Pressing the or button will change the flashing digit and will transfer control to the second digit While making adjustments the filtered rate display is shown on the lower d...

Страница 23: ...on to change the setting followed by the button twice to enter the change and return to the LoC clr prompt in the configuration menu 6 21 Grand total reset from configuration menu Clr Gtot The grand total is a separate sixteen digit counter which is incremented in parallel with the total display but is not zeroed when the total display is reset to zero The grand total may be viewed in the totalisa...

Страница 24: ...x nA certification The pulse output is a separate opto isolated Ex nA circuit with the following input safety parameters Ui 30V dc Ii 100mA This allows the pulse output to be connected to any dc circuit providing that in normal operation the maximum supply voltage is not greater than 30V dc Providing the BA334NG Rate Totaliser is correctly installed in Zone 2 the pulse output may be directly conne...

Страница 25: ... limit the pulse output current to less than 10mA For a 24V supply R1 should be greater than 2 200Ω Fig 11 Transferring pulse output to the safe area using Zener barriers 6 24 3 Configuration The pulse output menu shown in Fig 12 is in the BA334NG configuration menu The output pulse may be a duplicate of the input pulse by selecting dirECt in the 5ourCE sub function Alternatively selecting 5CALEd ...

Страница 26: ...se 1 10 100 1000 10000 Using the or push button select diVidE in the pulse output sub menu and press which will reveal the existing divisor The selected divisor can be changed by pressing the or push button followed by the button to return to diVidE prompt in the sub menu Note This function only appears in the pulse output sub menu when the 5CALEd is selected in the 5ource sub function 6 24 6 6 24...

Страница 27: ...alibration certificate specifying the average K factor and the flow range over which it applies For use over extended flow ranges and for non linear devices multiple K factors will be specified often in a table similar to the one shown below Flow Rate Litres min K factor Pulses litre 5 200 10 230 15 239 20 242 From this calibration certificate information the output frequency of the flowmeter whic...

Страница 28: ...28 ...

Страница 29: ...one of four sub functions If Add is not displayed repeatedly press the or button to select Add followed by which will cause the current segment and the total number of lineariser segments to be displayed as shown below Each time the push button is operated a segment will be added to the lineariser If configuring the lineariser for the first time repeatedly press until the required total number of ...

Страница 30: ...put is divided by L FACtor which is adjustable between 0 0001 and 99999 for flow applications it should be set to the K factor of the flowmeter K factor is the number of pulses that the flowmeter produces per unit volume of flow e g 20 pulses per litre L FACtor therefore converts the flowmeter output into engineering units ready for further scaling to produce the required rate and total flow displ...

Страница 31: ...oise protection If the Rate Totaliser is subsequently found to miscount the noise rejection can be increased Enter the selection and return to the inPut prompt in the configuration menu by pressing the button twice See 6 6 and 6 7 Step 4 Select the interval between display updates Using the or button select uPdAtE in the configuration menu and press to reveal how frequently the Rate Totaliser disp...

Страница 32: ...te to be displayed in the required engineering units The rate display timebase is determined by t bA5E that is adjusted in Step 11 In this example the rate of flow display is required in imperial gallons FACtor which was adjusted in Step 8 of this example produces an output in Litres that must be converted to imperial gallons There are 4 5461 Litres in an imperial gallon so 5CALE r should be adjus...

Страница 33: ...l reveal the sub menu Again using the or button select the local total reset function clr tot and press This function is required so using the or button select on followed by to return to the clr tot prompt in the sub menu Using the or button select the local grand total reset function clr gtot and press This function is not required so using the or button select oFF Finally return to the loc clr ...

Страница 34: ...both alarms 9 2 Fault finding after commissioning EN 60079 17 Electrical installations inspection and maintenance permits live maintenance in Zone 2 if a risk analysis demonstrates that this does not introduce an unacceptable risk The removal of covers opening of Ex n instrument enclosure is permitted if this can be done without contaminating the interior of the instrument with dust or moisture So...

Страница 35: ...ates or our local agent It is helpful if a brief description of the fault symptoms is provided 9 6 Customer comments BEKA associates is always pleased to receive comments from customers about our products and services All communications are acknowledged and whenever possible suggestions are implemented ...

Страница 36: ...may be applied to rate alarms CAUTION Alarm outputs should not be used for critical safety applications such as a shut down system When the BA334NG 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 an open output should therefore be chosen for the alarm condition Alarm annun...

Страница 37: ...ve use It is also necessary to ensure that the maintenance procedure makes sure that unauthorised re closure of the switches does not occur It is not considered necessary to have a means of isolation or electrical protection for the screen Fig 2 illustrates an example of this type of fused terminal block For some applications Ex nA instrumentation energised by a current limited power supply or ins...

Страница 38: ...splayed followed by which will reveal if the function is on or off The setting can be changed by pressing the or push button followed by the button to return to the alarm sub menu 10 3 5 Type of alarm tYPE Alarm 1 and Alarm 2 are totally independent both may be rate or total alarms or one may be conditioned for rate and the other for total Using the or push button select tYPE from the selected ala...

Страница 39: ... of the alarm output to be delayed for a fixed time following the alarm condition occurring The delay can be set in 1 second increments up to 3600 seconds If a delay is not required zero should be entered To adjust the delay select dELA using the or push button in the selected alarm sub menu and press which will reveal the existing delay time in seconds with one digit flashing The required delay t...

Страница 40: ...on select FL5H from the selected alarm sub menu and press to check or change the function The or push button will toggle the function between oFF and on when set as required press the button to return to the FL5H prompt in the alarm sub menu 10 3 13 Access Setpoint AC5P This function activates a separate menu that provides direct access to the alarm setpoints from the totalisation mode by simultan...

Страница 41: ...s obtained by operating the and push buttons simultaneously as shown in Fig 18 If the setpoints are not protected by a security code the alarm setpoint prompt 5P1r or 5P1t will be displayed depending upon whether a rate or total alarm has been conditioned If access to the setpoints is protected by a security code CodE will be displayed first Pressing again will allow the alarm setpoint security co...

Страница 42: ...ovide isolation Clear identification of and easy access to the means of isolation is essential for their effective use It is also necessary to ensure that the maintenance procedure makes sure that unauthorised re closure of the switches does not occur It is not considered necessary to have a means of isolation or electrical protection for cable screens For some applications Ex nA instrumentation e...

Страница 43: ...value and return to the 4 000 prompt in the 4 20mA output sub menu 10 4 7 Display which corresponds to 20mA output 20 000 The Rate Totaliser display which corresponds to a 20 000mA output current is defined by this function Using the or push button select 20 000 in the 4 20mA output sub menu and press which will reveal the existing rate or total display with one digit flashing The required display...

Страница 44: ...cated by the certificate number s X suffix These state that the BA334NG Rate Totaliser should be a Supplied from a limited energy circuit with output parameters in normal operation equal to or less than the instrument s input parameters The certificate states that It is not necessary to power the instrument from an intrinsically safe interface such as a certified shunt diode safety barrier or a ga...

Страница 45: ...ers are identical to the ATEX safety parameters described in the main section and Appendix 1 of this manual The IECEx certificate may be downloaded from the BEKA associates or the IECEx website or may be requested from the BEKA sales office A2 2 Installation The IECEx and ATEX certificates specify identical safety parameters and installation requirements for both gas and dust approvals as defined ...

Страница 46: ...Gc Zone 22 AEx ic tc IIIC T80ºC Dc Ta 40 C to 60 C cETL codes for Canada Ex nA ic IIC T5 Gc Ex n IIC T5 Gc Ex ic tc IIIC T80ºC Dc Class III Div 2 Class II Div 2 Gp F G Ta 40 C to 60 C The ETL and cETL safety parameters are the same as ATEX and IECEx parameters therefore the systems shown in the main section of this manual and in Appendix 1 may be used for US and Canadian installations subject to c...

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