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BA304D
Intrinsically safe
loop-powered
3½ digit field
mounting indicator

i

ssue 12

Issue: 12

25

th

September 2008

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Summary of Contents for BA304D

Page 1: ...BA304D Intrinsically safe loop powered 3 digit field mounting indicator issue 12 Issue 12 25th September 2008 ...

Page 2: ...ing commissioning 7 2 Fault finding after commissioning 7 3 Servicing 7 4 Routine maintenance 7 5 Guarantee 7 6 Customer comments 8 Accessories 8 1 Units of measurement instrument identification 8 2 Internal calibrator 8 3 Root extractor 8 3 1 Calibration example with root extractor 8 4 Display backlight 8 4 1 Separately powered backlight 8 4 2 Loop powered backlight 8 5 Pipe mounting kits Appendi...

Page 3: ...e with an armoured glass window 2 OPERATION Fig 1 shows a simplified block diagram of a BA304D 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 analogue to digital converter and liquid crystal display The voltage developed across R1 which is p...

Page 4: ... installed in Zone 0 explosive gas air mixture continuously present Zone 1 explosive gas air mixture likely to occur in normal operation Zone 2 explosive gas air mixture not likely to occur and if it does will only exist for a short time Be used with gases in groups Group A propane Group B ethylene Group C hydrogen Having a temperature classification of T1 450 C T2 300 C T3 200 C T4 135 C T5 100 C...

Page 5: ...300ohm device Again it is necessary to ensure that the voltage capability of the 4 20mA signal is sufficient to drive the indicator plus the voltage drop introduced by the intrinsically safe interface Figs 3A 3B and 3C show the alternative circuits which may be used 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 20m...

Page 6: ...h 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 BA304D enclosure is fitted 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 unscrewi...

Page 7: ...g 6 shows the position of the span links and the span potentiometer Position Instrument span of span links adjustable between 000 to 500 000 and 500 or 500 to 1000 500 and 1000 or 1000 to 1500 1000 and 1500 or 1500 to 1999 1500 and 1999 6 3 Decimal point A decimal point may be displayed between any of the four digits The position or absence of this dummy decimal point is determined by the position...

Page 8: ...er range is indicated by 1 and over range by 1 If the display range is not exceeded the BA304D will produce accurate readings outside the 4 20mA current range Although not guaranteed most BA304D indicators will operate between 3 and 25mA Fig 6 Position of plug in links and potentiometers shown with the control cover removed ...

Page 9: ...ay input has a voltage large ripple If this procedure does not reveal the cause of the fault it is recommended that the instrument is replaced Alternatively the electronic display assembly may be exchanged as described in section 7 3 7 3 Servicing We recommend that faulty instruments and instrument assemblies are returned to BEKA associates or to your local agent for repair Electronic components m...

Page 10: ...alibration should be checked annually 7 5 Guarantee Indicators which fail within the guarantee period should be returned to BEKA associates or our local agent It is helpful if a brief description of the fault symptoms is provided 7 6 Customer comments BEKA associates is always pleased to receive comments from customers about our products and services All communications are acknowledged and wheneve...

Page 11: ...nk which is located behind the instrument control cover The plug in root linear link shown in Fig 6 must always be in the root position when an internal calibrator is fitted An internal calibrator can not be fitted to an instrument with a root extractor When using an internal calibrator the following procedure should be followed at any input current between 4 and 20mA Step 1 Put the suppression el...

Page 12: ...the elevation suppression links in the suppression position and repeat step 5 Step 6 With 20 000mA input current adjust the span potentiometer until the indicator displays 140 0 Step 7 Repeat steps 5 and 6 until both calibration points are correct 8 4 Display backlight The BA304D may be supplied with two different backlights The loop powered backlight produces green background illumination enablin...

Page 13: ...ered backlight may be connected in series with the BA304D indicator Any Zener barrier or galvanic isolator certified EEx ia IIC by an EEC approved certification body may be used providing the output parameters do not exceed Uo 30V dc Io 200mA Po 0 85W For guidance ITS System Certificates Ex02E2031 and 2032 have been issued which list some of the devices that may be used and define cable parameters...

Page 14: ... indicator is installed See Figs 2 and 3 A1 2 4 20mA input in nonincendive circuit The BA304D is Factory Mutual approved as nonincendive for Class I II and III Division 2 locations which allows both indicators to be installed in Division 2 without the need for Zener barriers or galvanic isolators The maximum supply voltage must be less than 32V and the wiring must be nonincendive or Division 2 sui...

Page 15: ...ing the voltage does not exceed 32V The wiring must be nonincendive or Division 2 suitable A2 3 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 backlight thus significantly reduci...

Page 16: ...sive 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 BA304D 155 ...

Page 17: ...sic 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 BA304D All versions of the BA304D Fieldbus Display have IECEx certification This includes ATEX version for use in gas atmospheres IECEx code Ex ia IIC T5 Ta 40 C to 60 C ATEX version for use in gas and dust...

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