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A1.4

Special conditions for use in IIIC dusts

The   ATEX   certificate   has   an   ‘X’   suffix   indicating
that   special   conditions   apply   for   safe   use.     In
addition   to   the   electrostatic   special   conditions
specified in section 3.3 for installations in IIIC dust
atmospheres, the certificate states:

‘For   use   in   Group   IIIC   conductive   gas
atmospheres, the Rate Totaliser shall be
mounted   such   that   the   instrument
terminals have at least IP6X protection.’

To prevent the instrument terminals becoming
contaminated by conductive dust the BA358E must
be installed in a panel, cubicle or enclosure
providing a minimum of IP6X protection.

The gasket supplied to seal the joint between the
indicator and the mounting panel should be used
and the BA358E should be secured with four panel
mounting clamps.

Note:

These additional special installation

conditions only apply for indicators exposed to IIIC
conductive dust atmospheres.

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Summary of Contents for BA358E

Page 1: ...Issue 6 19th April 2016 BA358E Intrinsically safe 4 20mA loop powered panel mounting Rate Totaliser Issue 6 ...

Page 2: ...ariser 7 1 Calibration using external current source 7 1 1 Example Adding break points to a new Rate Totaliser 7 2 Calibration using internal reference 7 2 1 Example Adding break points to a new Rate Totaliser 7 3 Error messages 7 4 Under and over range 7 5 Default configuration 8 Calibration Examples 8 1 Using an external current source 8 2 Using the internal reference 9 Maintenance 9 1 Fault fin...

Page 3: ... 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 which takes about twelve seconds All segments of the display are activated Loading message displayed Configuration message displayed Model and firmware version displaye...

Page 4: ...S flashing operating the E button will then clear the grand total and Gt CLrd will be displayed to confirm the operation The instrument will then automatically return to the operating mode Selectable function in the configuration menu See section 6 17 Note Totalisation will continue until CLr no or CLr YE5 are displayed Resets the total display to zero when these two push buttons are operated simu...

Page 5: ...ixture 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 450o C T2 300o C T3 200o C T4 135o C T5 100o C At ambient temperatures between 40 and 70o C Note The specified operating temperature of...

Page 6: ...er or intrinsically safe relay is required to transfer the contact closure into the hazardous area Almost any intrinsically safe relay with certification permitting the contacts to be connected to equipment in the hazardous area may be used Alternatively a positive polarity Zener barrier with intrinsic safety parameters equal to or less than the input parameters of the reset terminals may be used ...

Page 7: ...paratus specified in Clause 5 7 of EN60079 11 i e be able to withstand a 500V rms insulation test for one minute The switch button should comply with the electrostatic requirements specified by Clause 7 of EN60079 0 and material composition defined in Clause 8 If it is required to reset the total display from the safe area a Zener barrier galvanic isolator or intrinsically safe relay must be used ...

Page 8: ...rth Also illustrates resetting from safe area Fig 3b Two Zener barrier channels are required if the 4 20mA current loop can t be earthed at the barrier busbar Also shows optional resetting from hazardous area Fig 3c Galvanic isolator can be used with any 4 20mA current loop 8 ...

Page 9: ... 4 shows the overall BA358E Rate Totaliser dimensions together with the recommended panel cut out dimensions To achieve an IP66 seal between the instrument enclosure and the instrument panel the smaller tolerance aperture should be used and the Rate Totaliser should be secured with four panel mounting clamps Although the Rate Totaliser front panel provides IP66 protection it should be shielded fro...

Page 10: ...te Totaliser s units of measurement are shown on a printed scale card in a window at the right hand side of the display The scale card is mounted on a flexible strip that is inserted into a slot at the rear of the instrument as shown in Fig 6 Thus the scale card can easily be changed without removing the BA358E Rate Totaliser from the panel or opening the instrument enclosure New instruments are s...

Page 11: ...to show the flow rate in the required linear engineering units Both the zero display at 4mA and the span display at 20mA are adjustable although for unidirectional flow application the display at 4mA is usually zero The position of the decimal point in the rate display is defined by the dP function To simplify calibration the BA358E uses floating point arithmetic moving the rate display decimal po...

Page 12: ...onfiguration Access code CodE 0000 Function FunC 5td Linear Rate display at 4mA Zero 0 00 Rate display at 20mA 5PAn 100 00 Resolution rE5n 1 digit P button in display mode C P Local reset of total t rE5Et off Local reset of grand total Gt rE5Et off Clip off CLIP oFF 000 00 Timebase t bA5E 1 Total scale factor 5CALE t 1 00 Upper display di5P 1 Total Update time uPdAtE 1 6 3 Summary of configuration...

Page 13: ... is operated in the display mode Select PC of 4 20mA input 4 20 Current in mA Note PC is not available with lineariser See section 6 14 Display Summary of function 5CALE t Total scale factor Defines the arithmetic relationship between the rate and total displays May be adjusted between 0 0001 and 99999 5CALE t Units of rate display Units of total display To calculate 5CALE t the required units of ...

Page 14: ...ontains two sub functions Select ConF Returns instrument to default configuration shown in section 6 2 LtAb Returns lineariser to defaults shown in section 7 5 Both instructions must be confirmed by entering 5urE digit by digit before they will be executed See section 6 19 14 ...

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Page 16: ...earity with bi directional flow Use of the lineariser is described in section 7 of this instruction manual 6 5 Display resolution rE5n This function defines the resolution of the least significant display digit of the rate display Decreasing the display resolution can improve the readability of a noisy signal Select rE5n from the menu and press P which will reveal the current display resolution To...

Page 17: ...ay and identify the lower display variable but on the larger upper display The position of the decimal point can be positioned in the same way by operating the and push buttons when set as required enter the setting and return to the conditioning menu by operating the E button 6 10 Calibration of the rate display using an external current source CAL This function enables the zero and span of the r...

Page 18: ...as been activated see section 6 17 To zero the grand total from within the configuration menu select Clr Gtot and press P which will cause the instrument to display Clr no Press the or button until CLr YES is displayed and then press P which will result in a 0000 prompt Using the and buttons and the P button to move to the next digit enter 5urE digit by digit to confirm the instruction Pressing E ...

Page 19: ... flow rates which over long periods may result in significant totalisation errors the BA358E rate display can be conditioned to stop totalisation when the flow rate falls below a specified clip off threshold Clip off is an absolute value for bi direction flow systems it inhibits totalisation for flow rates between clip off and clip off Clip off is shown in the same units as the instruments rate di...

Page 20: ... Rate Totaliser is returned to the display mode Please contact BEKA associates sales department if the security code is lost 6 19 Reset to factory defaults r5Et This function enables the Rate Totaliser and the lineariser to be quickly returned to the factory default configurations shown in sections 6 2 and 7 5 To reset the Rate Totaliser or lineariser select r5Et from the configuration menu and pr...

Page 21: ... Lineariser calibration using an external current source This method 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 The number of break point required should first be entered using the Add an...

Page 22: ...22 ...

Page 23: ...ollowing break point 7 1 1 Example Adding break points to a new Rate Totaliser When adding break points to a new Rate Totaliser or to a lineariser following resetting to the factory defaults using the LtAb function described in section 6 19 each additional break point should be added before the highest existing breakpoint The first additional break point should be added before the default break po...

Page 24: ...he E button The corresponding rate 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 rate d...

Page 25: ...her the root extractor or the lineariser are required The standard linear relationship should therefore be selected With FunC displayed press P which will reveal the existing function Using the or button select Std Press E to enter this selection and return to the FunC prompt in the configuration menu Step 4 Define function of P push button Select C P from the configuration menu and press P to rev...

Page 26: ... the totaliser scaling factor In this example the rate display is in litres per minute but the total display is required in cubic metres 5CALE 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 5CALE t 1000 From the configuration menu select 5CALE t and press P to reveal the current five digit dividing factor Using ...

Page 27: ...n and total flow in cubic metres with a resolution of 0 1 cubic metres Total is to be shown on the upper large display and rate on the lower smaller display Totalisation is to occur for flow rates between 1 and 100 of maximum flow A security code of 1209 is required In the operating mode the BA358E is required to display the input current as a percentage of span when the P push button is operated ...

Page 28: ...fy the cause of the failure Symptom Cause Check No display and no voltage between terminals 1 3 No power supply Confirm that a 4 20mA 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 Unable to access configuration menu Incorrect security code Ente...

Page 29: ...upplied with the tag or application information specified when ordered thermally printed onto the rear panel adjacent to the terminals This tag information is not visible from the front of the instrument after installation 10 3 Alarms CAUTION These alarms outputs should not be used for critical safety applications such as an emergency shut down system The BA358E Rate Totaliser can be supplied with...

Page 30: ... EN 60079 11 for simple apparatus This simplifies system documentation and allows the alarm output terminals 8 9 and 10 11 to be connected to almost any intrinsically safe circuit protected by a Zener barrier or galvanic isolator providing the output parameters of the circuit do not exceed Uo 30V dc Io 200mA Po 0 84W The maximum equivalent capacitance and inductance between each set of alarm termi...

Page 31: ...31 ...

Page 32: ...ated when the selected display rate or total equals the setpoint See section 10 3 6 Hi Lo Alarm function Defines the alarm function as High or Low See section 10 3 7 no nC Normally open or normally closed output Sets the alarm output open or closed in the non alarm condition See section 10 3 8 H5tr Hysteresis Adjusts the alarm hysteresis Only available on rate alarms See section 10 3 9 dELA Alarm ...

Page 33: ...by pressing the or button followed by the E button to return to the alarm menu 10 3 8 Alarm output status no nC Configures the solid state alarm output to be open no or to be closed nC in the non alarm condition When deciding which is required care should be taken to ensure that the alarm output is fail safe as illustrated in Fig 11 no Alarm output open in non alarm condition nC Alarm output close...

Page 34: ...rate or total display depending upon which has caused the alarm alternates between the numerical value and the alarm reference ALr1 or ALr2 when the alarm output is activated If both alarm outputs are activated by one variable the display alternates between the numerical value and Alr1 2 To enable or disable the function select FL5H from the alarm menu and press P which will reveal the current set...

Page 35: ...n to the display mode Fig 15 Setpoint adjustment from the display mode To adjust an alarm setpoint select 5Px1 or 5Px2 and press P which will reveal the current setting Each digit of the setpoint may be adjusted using the and push buttons and the P button to move control to the next digit When the required setpoint has been entered pressing E will return the display to the 5Px1 or 5Px2 prompt from...

Page 36: ...output voltage current and power of the combined Rate Totaliser and backlight terminals 12 3 will not exceed 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 backlight loop p...

Page 37: ...ve 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 use apply see section A1 4 Having a Minimum Ignition Temperature of...

Page 38: ... shall be mounted such that the instrument terminals have at least IP6X protection To prevent the instrument terminals becoming contaminated by conductive dust the BA358E must be installed in a panel cubicle or enclosure providing a minimum of IP6X protection The gasket supplied to seal the joint between the indicator and the mounting panel should be used and the BA358E should be secured with four...

Page 39: ... section and Appendix 1 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 safe use The IECEx certificate has an X suffix indicating that special conditions apply for safe use WARNING To avoid an electrostatic charge being generated instrument enclosure should only be cleaned with a damp cloth A2 3 Specia...

Page 40: ...d with the following gases Intrinsic Safety Division 1 or 2 Class I Group A B Group C Group D Zone 0 1 or 2 Class 1 Group IIC Group IIB Group IIA The FM and cFM entity 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 A3 2 Nonincendive approval The BA358E Rate Totaliser is also approved ...

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