BEKA BA307E-SS, Manual

Page 1: ...Issue 3 4th May 2017 BA307E SS BA327E SS intrinsically safe loop powered rugged panel mounting indicators Issue 3 ...

Page 2: ...7 2 Lineariser calibration using internal reference 7 2 1 Example adding break points to a new indicator 7 3 Under and over range 7 4 Lineariser under and over range 7 5 Lineariser default configuration 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 Accessories 9 1 Scale card 9 2...

Page 3: ...nd confirmed that the front of both instruments comply with Ex e Ex p and Ex t ingress and impact requirements The intrinsic safety EC Type Examination certificate specifies that under fault conditions the output voltage current and power at the 4 20mA input terminals will not exceed those specified for simple apparatus in Clause 5 7 of EN 60079 11 which simplifies installation and documentation F...

Page 4: ...x gas and dust certification This section of the instruction manual describes ATEX gas certification ATEX dust and IECEx approvals are described in Appendixes 1 and 2 3 1 ATEX gas certification Both models have been issued with common EC Type Examination Certificate ITS14ATEX28077X by Notified Body Intertek Testing and Certification Ltd This confirms compliance with harmonised European standards a...

Page 5: ...e and inductance between the two 4 20mA input terminals 1 and 3 is Ci 13nF Li 8µH Effectively 0 The maximum permitted loop cable parameters can be calculated by adding these figures to Ci and Li of other instruments in the loop and subtracting the totals from the maximum cable capacitance Co and cable inductance Lo permitted for the Zener barrier or galvanic isolator powering the loop Although the...

Page 6: ... 2 wire transmitter powered by a Zener barrier and alternatively by a galvanic isolator Fig 2a Loop powered by a Zener barrier Fig 2b Loop powered by a galvanic isolator 4 2 Remote indication The indicators may be driven via an intrinsically safe interface from a 4 20mA safe area signal to provide a remote display within a hazardous area The type of intrinsically safe interface is not critical eit...

Page 7: ...and impact protection as the front of both indicators comply with Ex e impact and ingress requirements Although mounted in an Ex e panel enclosure the BA307E SS or BA327E SS remains Group II Category 1G Ex ia IIC T5 Ga intrinsically safe apparatus so must be powered via a Zener barrier or galvanic isolator as described in section 4 1 and 4 2 of this manual Some Zener barriers and galvanic isolator...

Page 8: ...bed in section 4 1 and 4 2 of this manual to ensure that the instrument s front panel push button switches are nonincendive When installed in an Ex p panel enclosure the four vents at the rear of indicator which are shown in Fig 8 should not be obstructed Zener barriers and galvanic isolators may be installed in the same Ex p enclosure as the indicator All may be mounted in an Ex px enclosure inst...

Page 9: ...the edges of aperture are de burred b Inspect the indicator s captive gasket and ensure that it is not damaged before inserting the indicator into the panel enclosure aperture c If the enclosure panel is less than 1 0mm thick or is non metallic an optional BEKA stainless steel support plate should be slid over the rear of the indicator before the panel clamps are fitted to evenly distribute the cl...

Page 10: ...requested units of measurement if this information is not supplied when the indicator is ordered a blank card will be fitted A pack of self adhesive scale cards printed with common units of measurement is available as an accessory from BEKA associates Custom printed scale cards can also be supplied To change a scale card unclip the protruding end of the flexible strip by gently pushing it upwards ...

Page 11: ...0 Function FunC Std Std Display at 4mA Zero 0 0 0 00 Display at 20mA SPAn 100 0 100 00 Resolution rESn 1 digit 1 digit Bargraph start BarLo 0 00 Bargraph finish BarHi 100 00 P button in display mode C P Tare tArE Off Off Default configuration can easily be changed on site 6 1 Summary of configuration functions This section summarises each of the main configuration functions and includes a cross re...

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Page 13: ...e lineariser To reveal the existing indicator function select FunC from the configuration menu and press P If the function is set as required press E to return to the menu or press the or button to change the setting followed by the E button to return to the configuration menu Std Linear Provides a linear relationship between the 4 20mA indicator input current and the indicator display root Square...

Page 14: ...mA If these conditions are not complied with the indicator displays FaiL and aborts the calibration c If the zero current is greater than the span current the instrument will be reverse acting i e an increasing input current will cause the display to decrease 6 6 Calibration using internal reference SEt Using the SEt function the indicator can be calibrated without the need for an accurate externa...

Page 15: ...tting between on and oFF When set as required press E to return to the tARE prompt in the configuration menu 6 10 Security code CodE Access to the instrument configuration menu may be protected by a four digit security code which must be entered to gain access New instruments are configured with the default security code 0000 which allows unrestricted access to all configuration functions To enter...

Page 16: ...irect calibration of the lineariser with an external current source and is the preferred method when traceability is required If the exact system non linearity is unknown this method also allows direct calibration from the variable to be displayed e g the output from a level sensor in an irregular tank may be displayed in linear volumetric units by filling the tank with known incremental volumes a...

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Page 18: ...lowing break point 7 1 1 Example Adding break points to a new indicator When adding break points to a new indicator or to a lineariser following resetting to the factory defaults using the LtAb function described in section 6 11 each additional break point should be added before the highest existing breakpoint The first additional break point should be added before the default break point 1 1 whic...

Page 19: ...he corresponding indicator display at each of the break points can now be defined using the diSP sub function Using the and buttons select the diSP sub function and press P which will reveal the starting point for the first break point 0 n where n is the total number of break points entered Press P and use the and buttons and the P button to move between digits to enter the required indicator disp...

Page 20: ...el enclosure additional precautions may be required If an indicator fails after it has been functioning correctly follow the procedure shown in section 8 1 If this does not reveal the cause of the fault it is recommended that the instrument is replaced This can be done without disconnecting power but while the indicator is disconnected the 4 20mA loop will be open circuit 8 3 Servicing All BA307E ...

Page 21: ...rent powering the indicator is removed both alarm outputs will open irrespective of configuration The open circuit condition should therefore be chosen as the alarm condition when designing an alarm system Fig 13 illustrates the conditions available and shows which are fail safe When an alarm occurs an alarm annunciator on the indicator front panel is activated and if required the numerical displa...

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Page 23: ...l facilities Summary of alarm configuration functions Display Description of function EnbL Alarm enable Enables or disables the alarm without changing the alarm parameters See section 9 3 4 SP1 Alarm setpoint 1 Adjusts the alarm setpoint The alarm is activated when the indicator display equals the setpoint See section 9 3 5 Hi Lo Alarm function Defines the alarm function as High or Low See section...

Page 24: ... fail safe operation both alarm outputs should be conditioned to be open in the alarm condition nC To check or change the alarm output status select no nC from the alarm configuration menu and press P to reveal the setting The function may be changed by pressing the or button followed by the E button to return to the alarm configuration menu 9 3 8 Hysteresis HStr Hysteresis is shown in the units t...

Page 25: ...ng access to the indicator configuration menu Protection against accidental adjustment of the setpoints when the indicator is in the display mode is provided by a separate security code This direct setpoint access menu is enabled and the separate security code entered from the ACSP function in the alarm configuration menu as shown in Fig 15 To change the menu parameters select ACSP from the config...

Page 26: ...layed value to be represented or a low and a high setpoint plus the displayed value to be represented by the bargraph as shown in Fig 18 Fig 18 Displayed value and setpoints on bargraph The bargraph area below the low alarm setpoint SP1 and the bargraph area above the high alarm setpoint SP2 are activated The displayed variable is represented by an activated single bar which moves between the low ...

Page 27: ...xceed those specified by clause 5 7 of EN 60079 11 for simple apparatus which simplifies system design and documentation Providing the increased voltage drop can be tolerated the intrinsic safety and system design described in sections 3 and 4 of this manual remain valid with the loop powered backlight 9 4 2 Separately powering the backlight The optional backlight may also be powered from a separa...

Page 28: ... 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 dust in subdivisions IIIA combustible flyings IIIB non conductive dust IIIC conductive dust For use with IIIC conductive dusts special conditions for safe...

Page 29: ...he inside of an Ex t enclosure is effectively a safe area and the certified intrinsically safe interface may therefore be mounted in the same Ex t panel enclosure as the indicator The indicator terminals the wiring to the indicator and the intrinsically safe interface if mounted within the enclosure should be segregated from all other non intrinsically safe wiring and equipment within the panel en...

Page 30: ...of this manual may therefore be used for IECEx installations but the local code of practice should also be consulted A2 3 Special conditions for use in IIIC dusts The IECEx intrinsic safety certificate has an X suffix indicating that for some applications special conditions apply for safe use which are identical to ATEX special conditions for safe use a When installed in an Ex px Ex py or Ex pz pa...

Page 31: ... parameters are similar to the ATEX and IECEx parameters and the systems shown in section 4 of this manual may therefore also be used for FM and cFM installations The FM and cFM Control Drawing CI300 72 for intrinsically safe applications which is contained in this appendix specifies that when correctly installed a BA307E SS or a BA327E SS will not invalidate the certification of an AEx e AEx p or...

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