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BA324D
Intrinsically safe
loop-powered
4½ digit field
mounting indicator

issue 12

Issue: 12

4

th

March 2014

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Summary of Contents for BA324D

Page 1: ...BA324D Intrinsically safe loop powered 4 digit field mounting indicator issue 12 Issue 12 4th March 2014 ...

Page 2: ...ng 8 2 Fault finding after commissioning 8 3 Servicing 8 4 Routine maintenance 8 5 Guarantee 8 6 Customer comments 9 Accessories 9 1 Units of measurement and instrument identification 9 2 Alarms 9 2 1 Solid state output 9 2 2 Intrinsic safety 9 2 3 Programming and adjustment 9 2 4 Alarm enable 9 2 5 Setpoint adjustment 9 2 6 Alarm function 9 2 7 Alarm output status 9 2 8 Hysteresis 9 2 9 Alarm del...

Page 3: ...EN50020 1994 The indicator is housed in a robust IP66 glass reinforced polyester GRP enclosure with an armoured glass window 2 OPERATION Fig 1 shows a simplified block diagram of a BA324D The 4 20mA input current flows through resistor R1 and forward biased diode D1 The voltage developed across D1 which is relatively constant is multiplied by a switch mode power supply and used to power the instru...

Page 4: ... does not itself comply with the requirements for simple apparatus the EC Type Examination Certificate specifies that under fault conditions the voltage current and power at the 4 20mA input terminals 1 and 3 will not exceed those specified for simple apparatus in Clause 5 4 of EN50020 1994 This allows the BA324D to be connected into any intrinsically safe circuit protected by a Zener barrier or g...

Page 5: ...cator Fig 2 illustrates a typical application in which a BA324D indicator is connected in series with a 2 wire transmitter protected by a Zener barrier Fig 2 BA324D in a transmitter loop 4 2 Remote indication A BA324D may be driven from a 4 20mA safe area signal via an intrinsically safe interface to provide a remote indication within a hazardous area The type of interface is not critical either a...

Page 6: ...terminals 5 and 6 are internally joined and may be used for linking cable screens The BA324D earth terminal is connected to the internal EMC filters For maximum radio frequency interference rejection this terminal should be connected to a local earth or to a cable screen which is earthed in the safe area To prevent circulating currents cable screens should only be earthed in the safe area The BA32...

Page 7: ...wiring should be in screened twisted pairs with the screens earthed in the safe area Additional immunity may be obtained by connecting the BA324D earth terminal to a local earth or to a cable screen which is earthed in the safe area If this terminal is not connected personal and intrinsic safety will not be degraded Fig 5 Dimensions and terminal connections ...

Page 8: ...he first parameter root to be displayed If an incorrect code is entered the indicator will return to the display mode Once within the menu the required parameter can be reached by scrolling through the main menu using the Up and Down push buttons as shown in Fig 6 When returning to the display mode following recalibration or changes to any parameters the indicator will display circulating decimal ...

Page 9: ...ion 50 or 60Hz may be selected This function must be set before the instrument is calibrated as it affects the indicator display See section 6 7 1 rEF Calibration of internal references The indicator contains two references representing a 4 and 20mA input These enable the BA324D display to be calibrated without the need for an external calibrator or disconnection from the 4 20mA loop See the SEt f...

Page 10: ...10 ...

Page 11: ...igit When all the digits have been adjusted press E to enter the new zero The indicator will display Ent for a few seconds while the information is being stored in memory and will then return to the ZErO prompt To adjust the display at 20mA press the Up button which will cause the indicator to display SPAn Adjust the external current calibrator to 20 000mA and again press P which will reveal the e...

Page 12: ...nal current calibrator to 20 000mA and again press P The indicator will display Ent when the 20mA reference has been updated and will then return to the 020A prompt Two operations of the E button will return the indicator to the main menu The accuracy of the internal references and hence the display accuracy will depend upon the accuracy of the external current source With a maximum span of 19999 ...

Page 13: ...lay the input current as a percentage of span when the P push button is operated Step 1 Connect indicator to calibrator Connect the indicator to an accurate external current source Terminal 1 positive The indicator will automatically perform the initialisation routine described in section 2 and then display the input current using the existing calibration information Step 2 Enter programming mode ...

Page 14: ...existing security code is 1209 In the operating mode the indicator is required to display the input current in milliamps when the P push button is operated This example assumes that the internal references have been routinely calibrated Step1 Enter the programming mode With an input current between 4 and 20mA put the indicator in the programming mode by simultaneously pressing P and E The indicato...

Page 15: ...or fit security programme code link in override position mode entered See Fig 7 8 2 Fault finding after commissioning ENSURE PLANT SAFETY BEFORE STARTING MAINTENANCE Live maintenance is permitted on intrinsically safe equipment installed in a hazardous area but only certified test equipment should be used unless a gas clearance certificate is available If a BA324D fails after it has been functioni...

Page 16: ...s are acknowledged and whenever possible suggestions are implemented 9 ACCESSORIES 9 1 Units of measurement and instrument identification All BA324D indicators are fitted with a blank label around the liquid crystal display This label can be supplied printed with any units of measurement and tag information specified at the time of ordering Alternatively the information may be added on site via an...

Page 17: ...ltage current and power at each alarm output will not exceed those specified for simple apparatus in Clause 5 4 of EN50020 1994 This allows each of the BA324D alarm outputs to be connected to any intrinsically safe circuit protected by a Zener barrier or galvanic isolator providing that the output parameters of each circuit do not exceed Uo 28V dc Io 200mA Po 0 85W No system certificate has been i...

Page 18: ...b menu which enables direct access to the alarm setpoints from the indicator display mode and defines a separate security code See section 9 2 11 9 2 4 Alarm enable EnbL This function allows the alarm to be enabled or disabled without altering any of the alarm parameters To check or change the function select EnbL from the alarm menu and press P which will reveal the current setting The function c...

Page 19: ...e non alarm condition for the programmed alarm silence time The display will continue to indicate an alarm after it has been accepted and silenced The alarm silence time may be adjusted between 0 and 3600 seconds in 1 second increments To adjust the alarm silence time select SIL from the alarm menu and press P which will reveal the existing time Each digit can be adjusted using the Up and Down pus...

Page 20: ...de COde will be displayed first Pressing P again will enable the alarm security code to be entered digit by digit using the Up and Down buttons to change the flashing digit and the P push button to move to the next digit If the correct code is entered pressing E will cause alarm setpoint prompt SP1 to be displayed Pressing the Up or Down button will toggle the display between the two alarm setpoin...

Page 21: ... Up to sixteen break points may be programmed to occur at any input current between 4 and 20mA The slope between adjacent break points may be set anywhere between 1250 and 1250 display counts per milliamp Greater slopes may be programmed but the indicator performance will be degraded A linear characteristic can be obtained by programming just two points one at 4mA and the other at 20mA Fig 13 Typi...

Page 22: ... points entered The selected break point can be changed using the Up and Down buttons When the required break point has been selected press P Set the indicator input current to the exact value at which the break point is to occur and adjust the indicator display using the Up and Down buttons and P to move between digits When the required display has been set press E to enter the information and re...

Page 23: ...Down buttons When the required break point has been selected press P to reveal the input current at which the break point occurs Using the Up and Down buttons and P to move between digits set the revised input current in mA Press E to return to the sub menu from which another break point can be selected Repeat this procedure for all the break point input currents to be changed and then return to t...

Page 24: ...24 ...

Page 25: ...falls below 20mA Backlight current Vsupply 18 End to end resistance of barrier or output resistance of galvanic isolator 9 5 2 Loop powered backlight This backlight is connected in series with the 4 20mA measuring circuit so that like the BA324D indicator it is powered by the 4 20mA signal This eliminates the need for a separate Zener barrier or galvanic isolator and associated wiring for the back...

Page 26: ...orizontal or vertical pipe BA392D Stainless steel bracket secured by two worm drive hose clips Will clamp to any pipe with outside diameter between 60 and 80mm BA393 Heavy duty stainless steel bracket secured by a single V bolt Will clamp to any pipe with an outside diameter between 40 and 80mm ...

Page 27: ...icator is installed See Figs 2 and 3 A1 2 4 20mA input in nonincendive circuit The BA324D is also Factory Mutual approved as nonincendive for Class I II and III Division 2 locations which allows it to be installed in Division 2 without the need for Zener barriers or galvanic isolators The maximum supply voltage must be less than 32V The wiring must be nonincendive or Division 2 suitable A1 3 Class...

Page 28: ...or the Zener barrier or galvanic isolator powering the backlight Segregation between the backlight and the measuring circuits should be maintained by following the wiring methods recommended in ANSI NFPA70 article 504 See Fig 15 A3 1 2 Nonincendive applications For nonincendive applications a Zener barrier or galvanic isolator is not required The backlight may be powered directly from a dc supply ...

Page 29: ...explosive 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 BA324D...

Page 30: ...insic safety parameters are identical to the ATEX parameters The IECEx certificate may be downloaded from www beka co uk www iecex com or requested from the BEKA sales office A3 2 Versions of the BA324D All versions of the BA324D indicator have IECEx certification This includes ATEX version for use in gas atmospheres IECEx code Ex ia IIC T5 Ta 40o C to 60 o C ATEX version for use in gas and dust a...

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