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Issue: 5

September 2008

BA354D

Intrinsically safe

4/20mA loop-powered

field mounting

rate totaliser

issue 5

Содержание BA354D

Страница 1: ...Issue 5 16th September 2008 BA354D Intrinsically safe 4 20mA loop powered field mounting rate totaliser issue 5 ...

Страница 2: ... button 6 13 Total scale factor 6 14 Percentage clip off 6 15 Local reset of total display 6 16 Security code 6 17 Over and under range 7 Calibration Examples 7 1 Using an external current source 7 2 Using the internal references 8 Maintenance 8 1 Fault finding during commissioning 8 2 Fault finding after commissioning 8 3 Servicing 8 4 Routine maintenance 8 5 Guarantee 8 6 Customer comments 9 Acc...

Страница 3: ... is multiplied by a switch mode power supply and used to power the instrument The voltage developed across R1 which is proportional to the 4 20mA input current provides the input signal for the analogue to digital converter Each time a 4 20mA current is applied to the instrument initialisation is performed After a short delay the following display sequence occurs All segments of the display are ac...

Страница 4: ...n issued with an EC Type Examination Certificate by Notified Body ITS Intertek Testing and Certification confirming compliance with the European ATEX Directive 94 9 EC for Group II Category 1 gas and dust atmospheres EEx ia IIC T5 The instrument bears the Community Mark and subject to local codes of practice may be installed in any of the European Economic Area EEA member countries ATEX certificat...

Страница 5: ...nt in the hazardous area may be used Alternatively one of the positive diode return Zener barriers listed in the system certificate may be used see Fig 3A 3 4 Zones gas groups and T rating The BA354D has been issued with an EC Type Examination certificate confirming that it complies with the requirements for Group II Category 1 G EEx ia IIC T5 Tamb 40 to 60o C specified in the ATEX Directive When ...

Страница 6: ...otal flow within a hazardous area The type of interface is not critical either a Zener barrier or a galvanic isolator may be used providing that Uo Io and Po are not exceeded If one side of the 4 20mA current loop may be earthed a single channel Zener barrier provides the lowest cost protection If the 4 20mA signal is not isolated then two Zener barriers a two channel Zener barrier or a galvanic i...

Страница 7: ...ns are pushed simultaneously for 2 seconds or an external switch located in the safe or the hazardous area may be used Fig 3A illustrates how the total display may be reset from the safe area via a single channel diode return Zener barrier A certified intrinsically safe relay or certified opto isolator may also be used Fig 3B shows how the total display may be reset to zero by an external switch i...

Страница 8: ...thed in the safe area To prevent circulating currents cable screens should only be earthed at one point in the safe area The BA354D enclosure is supplied with a bonding plate to ensure electrical continuity between the three conduit cable entries 5 2 Installation Procedure Fig 4 illustrates the instrument installation procedure a Remove the instrument terminal cover by unscrewing the two captive A...

Страница 9: ...9 Fig 5 Dimensions and terminal connections ...

Страница 10: ...d totalisation is suspended any flow occurring during this time will not be recorded 6 1 Calibration structure Fig 6 shows the BA354D calibration structure The 4 20mA input current which in flow applications represents flow rate is displayed on the five digit rate display Using the instrument CAL or SEt functions this display may be calibrated to show the flow rate in engineering units Both the ze...

Страница 11: ...or the instrument using the Up or Down push button adjust each digit and the P push button to move control to the next digit If the correct code has been entered pressing E will cause the first parameter root to be displayed If an incorrect code is entered or a push button is not operated the instrument will timeout after ten seconds and automatically return to the display mode Apart from defining...

Страница 12: ...ecimal point clip off to adjust value Press or between 0 and 10 or and pressing Define Security Enter by Code to move to next digit Local reset or Fig 7B Programme Structure CLr Gtot E E E E E E E E P P E P E P E P E P E P E P P To Cond function on Fig 7A SurE P E SurE using or to adjust display and to move to next digit P CLIP OFF SCALE t tb 1 to define rate display timebase select tb 1 for flow ...

Страница 13: ...larly set the required full scale display accurate 20mA input current scale display using an Similarly set the required full to move to next digit pressing or and set required zero display by With accurate 4mA input current external current source Calibration of rate display using displays toggle between and to decimal point position of to select or Decimal point or to select Resolution On and OFF...

Страница 14: ...e current source this is the preferred method of calibration See section 6 7 SEt Calibration of rate display using internal references Enables the zero and span of the rate display to be adjusted without the need for an accurate input current or disconnection from the 4 20mA loop See section 6 8 Display Description of function Cond Indicator conditioning This is a protected sub menu which contains...

Страница 15: ...eal if the function is On or OFF If the function is set as required press E to return to the menu or press the Up or Down button to change the setting followed by the E button to return to the main menu For reference the following table shows the output current from a non linearised differential flowmeter of full flow Current output mA 2 5 4 01 10 0 4 16 25 0 5 00 50 0 8 00 75 0 13 00 100 0 20 00 ...

Страница 16: ...e digits have been adjusted press E to enter the new span The instrument will display Ent for a few seconds while the information is being stored in memory and will then return to the SPAn prompt Finally press E again to return to the main menu This function may also be used to calibrate a complete loop including the flow meter 6 8 Calibration of rate display using internal references SEt This fun...

Страница 17: ... prompt in the main menu 6 10 Resetting grand total CLr Gtot The grand total is a separate sixteen digit counter which duplicates the total display but is not zeroed when the total display is reset to zero The grand total may be viewed in the operating mode in two eight digit sections as described in section 2 1 of this manual The grand total counter can only be reset to zero from the CLr Gtot fun...

Страница 18: ...r select SCALE t from the main menu and press P to reveal the existing setting one digit will be flashing The value of the flashing digit can be changed by pressing the Up or Down buttons When this digit is correct pressing P will transfer control to the next digit To position the decimal point move the flashing digit to the left hand side of the required decimal point position and simultaneously ...

Страница 19: ...rride link To gain access to the security code link remove the instrument control cover by undoing the two C screws see Fig 4 If the instrument is fitted with external push buttons the connecting ribbon cable should be un plugged The security code override link is located on the inner row of the five pin connector shown in Fig 8 6 17 Over and under range If the rate display range is exceeded the f...

Страница 20: ...3 Turn square root extractor off With root displayed press P which will reveal the root extractor status The root extractor can be turned on or off by operating the Up or Down buttons Select OFF and press E to return to the root prompt in the main menu Step 4 Select frequency of maximum mains line rejection Scroll though the main menu until Cond is displayed and press P which will result in the in...

Страница 21: ...splay is in litres per minute but the total display is required in cubic metres SCALE t Units of rate display Units of total display There are 1 000 litres in a cubic metre thus litres _ cubic metres 1 litre _ 1 1000 litres SCALE t 1000 From the main menu select SCALE t and press P to reveal the current five digit dividing factor Using the Up and Down buttons to adjust the flashing digit and the P...

Страница 22: ... internal references are that the instrument does not have to be disconnected from the measurement loop and no calibration equipment is required Steps 1 2 Enter the programming mode The BA354D may be recalibrated without disconnection from the 4 20mA measurement loop With any input current between 4 and 20mA put the instrument in the programming mode by simultaneously pressing P and E Assuming a s...

Страница 23: ...current is flowing in the loop Unstable rate display 4 20mA current is noisy or the flow signal is unstable Eliminate source of electrical noise Reduce resolution of the rate display to mask flow noise Incorrect calibration Digital filter FrE has been changed after indicator was calibrated Recalibrate indicator with digital filter FrE set to required frequency Unable to enter programme mode Incorr...

Страница 24: ...repair 8 4 Routine maintenance The mechanical condition of the instrument and electrical calibration should be regularly checked The interval between inspections depends upon environmental conditions We recommend that initially instrument calibration should be checked annually 8 5 Guarantee Instruments which fail within the guarantee period should be returned to BEKA associates or our local agent ...

Страница 25: ... normally open or normally closed outputs Fig 9 illustrates the conditions available for a rate alarm and shows which are fail safe i e output is in the alarm condition open when the 4 20mA input current is zero Similarly when programmed as a total alarm the output should be open in the alarm condition WARNING These alarm outputs should not be used for critical safety applications such as a shut d...

Страница 26: ...equivalent capacitance and inductance of each BA354D alarm output is C 40nF L 20µH To determine the maximum permissible cable parameters the equivalent alarm output parameters must be subtracted from the maximum cable capacitance and inductance specified by the system certificate of the circuit connected to each alarm Fig 11 Typical alarm application 9 2 3 Programming and adjustment When a BA354D ...

Страница 27: ... Down button followed by the E button to return to the alarm menu 9 2 5 Type of alarm tYPE This function conditions the alarm to operate on the rate or total display Alarm 1 and Alarm 2 may both be rate or total alarms or one may be conditioned for rate and the other for total To check or change the type of alarm select tYPE from the alarm menu and press P which will reveal the current setting The...

Страница 28: ... button followed by the E button to return to the alarm menu 9 2 9 Hysteresis HStr Hysteresis is only available on rate alarms During programming hysteresis is shown in the units of rate the BA354D has been calibrated to display To adjust the hysteresis select HStr from the alarm menu and press P which will reveal the existing figure Each digit can be adjusted using the Up and Down push buttons an...

Страница 29: ...u is enabled and a separate security code entered from the AcSP function in the main programme menu as shown in Fig 12 To change the menu parameters select AcSP from the programme menu and press P which will display the enable prompt EnbL Press P again to reveal if the direct access menu is On or OFF The Up or Down buttons will toggle the display between the two conditions If OFF is selected the o...

Страница 30: ...h LED backlighting to improve display contrast when the instrument is installed in a poorly illuminated area The backlight is segregated from the measuring circuit and has been certified as a separate intrinsically safe circuit but it does not comply with the requirements for simple apparatus Systems certificates for use with Zener barriers and galvanic isolators have therefore been issued The bac...

Страница 31: ...nal membrane keypad These switches which maintain the IP66 integrity of the enclosure allow all functions to be controlled without removing either of the enclosure covers 9 5 Pipe mounting kits Two pipe mounting kits are available for securing the BA354D to a horizontal or vertical pipe BA392D Stainless steel bracket secured by two worm drive hose clips for 60 to 80mm outside diameter pipes BA393 ...

Страница 32: ...ing 8 1 after commissioning 8 2 Flow indicator 2 2 Flow transmitter loops 4 1 Galvanic isolators 4 0 Gas groups 3 4 Grand total 2 1 clear 6 3 6 10 Guarantee 8 5 HI LO 9 2 3 9 3 7 HStr 9 2 3 9 2 9 Input 4 20mA 3 2 Internal references 6 3 6 9 Installation 5 2 Instrument identification 9 1 Intrinsic safety 1 0 3 0 9 2 2 9 3 Subject Section LOC rSEt 6 15 Location 5 1 Maintenance 8 0 routine 8 4 Mounti...

Страница 33: ...osive atmosphere in the form of a cloud of combustible dust in air is likely to occur occasionally in normal operation Zone 22 explosive atmosphere in the form of a cloud of combustible dust in air is not likely to occur in normal operation but if it does occur will only persist for a short period Be used with dusts having a Minimum Ignition Temperature of Dust cloud 120 C Dust layer on BA354D 155...

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