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Issue: 2

30th September 2020

BA304SG & BA324SG

Increased safety Ex eb and

dust ignition protection by

enclosure Ex tb

loop-powered

field mounting indicators

Issue 2

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Summary of Contents for BA304SG

Page 1: ...Issue 2 30th September 2020 BA304SG BA324SG Increased safety Ex eb and dust ignition protection by enclosure Ex tb loop powered field mounting indicators Issue 2 ...

Page 2: ... format and calibration bAr 6 8 Function of the push button C P 6 9 Tare function tArE 6 10 Security code CodE 6 11 Reset to factory defaults r5Et 6 12 Under and over range 7 Lineariser 7 1 Lineariser calibration using an external current source 7 1 1 Example Adding break points to a new indicator 7 2 Lineariser calibration using internal reference 7 2 1 Example Adding break points to a new indica...

Page 3: ...y backlight is available as an option Model Display BA304SG 4 digits 34mm high BA324SG 5 digits 29mm high and 31 segment bargraph This instruction manual supplements the instruction sheet supplied with each instrument The main application of both models is to display a measured variable or control signal in a gas or dust hazardous process area The zero and span of the display are independently adj...

Page 4: ...cation Increased safety Ex eb is a type of electrical equipment protection which provides increased security against the possibility of excessive temperatures and against the occurrence of arcs and sparks The requirements are defined by international standard IEC 60079 7 which is published in the UK as BS EN 60079 7 To allow the BA304SG and BA324SG to be installed in Zone 1 both indicators incorpo...

Page 5: ...rom a SELV separated or safety extra low voltage or PELV protected extra low voltage supply or from an adequately approved supply providing double or reinforced insulation as specified in IEC 60079 14 This requirement also applies to flameproof equipment and does not usually cause any difficulties because the power supply is required to be safe for personnel contact In European terms compliance wi...

Page 6: ...y with the requirements of IEC 60079 14 Electrical installations design selection and erection Figs 2 illustrates a typical application in which an indicator is connected in series with a 2 wire flameproof Ex d transmitter Alternatively an increased safety Ex e pressurised Ex p or in Zone 2 a Type n Ex nA transmitter could be used Fig 2 Typical application showing indicator displaying transmitter ...

Page 7: ... intrinsic safety should be mechanically robust having a toughened outer sheath or armour Wiring should have adequate voltage and current rating and should comply with the requirements of IEC60079 14 Section 9 Cables and Wiring Systems Cables should be suitable for the anticipated operating temperature protected from voltage overloads and have a clearly defined means of isolation No additional cab...

Page 8: ...8 Fig 6 Installation procedure Fig 7 Dimensions of BA304SG and BA324SG Fig 8 Terminal connections ...

Page 9: ...lied when the indicator 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 an indicator carefully pull the transparent tab at the rear of the indicator assembly away from the indicator as shown in Fig 9a Fig 9a Removing s...

Page 10: ...efault Configuration BA304SG BA324SG Access code CodE 0000 0000 Function FunC Linear Linear Display at 4mA 2ero 0 0 0 00 Display at 20mA 5PAn 100 0 100 00 Resolution rE5n 1 digit 1 digit Bargraph start BarLo 0 00 Bargraph finish BarHi 100 00 button in display mode C P Tare tArE Off Off 6 1 Summary of configuration functions This section summarises each of the main configuration functions and inclu...

Page 11: ...11 ...

Page 12: ...ion Lin 16 segment adjustable lineariser To reveal the indicator s existing function select FunC from the configuration menu and press If the function is set as required press to return to the menu or press the or button to change the setting followed by the button to return to the configuration menu 5td Linear Provides a linear relationship between the 4 20mA indicator input current and the indic...

Page 13: ...ing the difference between the two currents is greater than 4mA 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 5Et Using the 5Et function the indicat...

Page 14: ...etting between on and oFF When set as required press 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 that 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 a...

Page 15: ...allows direct 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 v...

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Page 17: ...ing 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 r5et 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 which w...

Page 18: ...ction by pressing the button The corresponding indicator display at each of the break points can now be defined using the di5P sub function Using the and buttons select the di5P sub function and press which will reveal the starting point for the first break point 0 n where n is the total number of break points entered Press and use the and buttons and the button to move between digits to enter the...

Page 19: ... eb and Ex tb certified indicators The instrument enclosure should only be opened when the indicator is de energised or a gas dust clearance certificate has been issued 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 8 3 Servicing BA304SG and BA32...

Page 20: ...394G panel mounting kit which consists of two 316 stainless steel brackets will secure an indicator into a panel aperture The kit does not seal the joint between the panel and the instrument and is intended for mounting an indicator onto an open panel APPENDIX 1 Dust Certification A1 0 Ex tb dust certification In addition to IECEx and ATEX certification permitting installation in explosive gas atm...

Page 21: ...m foreign bodies It is good practice to prevent dust accumulating on the indicator enclosure If this can not be avoided care should be taken to ensure that the layer thickness does not exceed 5mm for dusts having a minimum ignition temperature of 155 C A1 3 Cable glands and conduit fittings Both back box cable entries have M20 x 1 5 threads The right hand entry is fitted with an Ex e and Ex t cert...

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