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10.4.1 Solid state output

Each alarm has a galvanically isolated single pole
solid state switch output as shown in Fig 13. The
outputs are polarised and current will only flow in one
direction. Terminals A1 and A3 should be connected
to the positive side of the supply.

Ron

=

less than 5



+ 0.7V

Roff

=

greater than 1M



Note:

Because of the series protection diode some

test meters may not detect a closed alarm
output.

Fig 13 Equivalent circuit of each alarm output

10.4.2 Intrinsic safety

Each alarm output is a separate galvanically isolated
intrinsically safe circuit with output safety parameters
complying with the requirements for

simple apparatus

.

This allows the alarm output terminals A1 & A2 and A3
& A4 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

≤

28V dc

Io

≤

200mA dc

Po

≤

0.84W

The maximum equivalent capacitance and inductance
between each set of alarm terminals is:

Ci

=

22nF

Li

=

4µH

To determine the maximum permissible cable
parameters Ci should be subtracted from the
maximum permitted external capacitance Co specified
by the certificate for the intrinsically safe interface
powering the alarm circuit, such as the solenoid driver
and switch transfer galvanic isolators shown in Fig 14.

Fig 14 Typical alarm application

10.4.3 Configuration and adjustment

When a BA337E or BA338E is supplied with alarms
the configuration menu is extended as shown in
Fig 15. The alarm functions appear after

clr gtot

,

and each alarm may be configured to operate on the
rate or total display.

For simplicity Fig 15 only shows the configurable
functions on the rate option of alarm AL1, the total
options is identical except that total alarms do not
have hysteresis.

Alarm AL2 is identical to alarm

AL1.

The following table summarises each of the alarm
configuration functions and includes a cross
reference to more detailed information. Again only
the functions on alarm AL1 are listed.

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Содержание BA337E

Страница 1: ...Issue 6 9th July 2019 BA337E and BA338E One input intrinsically safe pulse input rate totalisers Issue 6 ...

Страница 2: ...ummary of configuration functions 6 4 Rate totaliser function function 6 5 Input input 6 6 Input type inp type 6 7 Debounce debounce 6 8 Display update interval update 6 9 Upper display di5p 1 6 10 Lower display di5p 2 6 11 Position of decimal points dp 6 12 Flowmeter K factor factor 6 13 Total scale factor 5cale t 6 14 Rate scale factor 5cale r 6 15 Timebase t ba5e 6 16 Display filter filter 6 17...

Страница 3: ... 14 Adjusting alarm setpoints from totalisation mode 10 5 Pulse Output 10 5 1 Intrinsic safety 10 5 2 System design 10 5 3 Configuration 10 5 4 Pulse output pul5e op 10 5 5 Enable enbl 10 5 6 Pulse source 5ource 10 5 7 Output pulse frequency divide 10 5 8 Output pulse width duration 10 5 9 Pulse storage 10 6 4 20mA output 10 6 1 Intrinsic safety 10 6 2 System design 10 6 3 Configuration 10 6 4 4 2...

Страница 4: ...4 ...

Страница 5: ...ow and the total flow in the same or different engineering units The internal lineariser which can have up to sixteen straight line segments may be calibrated to compensate for flowmeter non linearity The BA337E and BA338E have a single pair of input terminals for connection to all types of transducer When counting pulses from a transducer requiring energising such as a switch contact open collect...

Страница 6: ...etpoints when the Rate Totaliser is fitted with optional alarms and the AC5P setpoints function has been enabled See 10 4 13 and 10 4 14 Access to configuration menu 2 3 Displays The BA337E and BA338E have two digital displays and associated annunciators plus a flow indicator as shown on page 1 Total Shows the total flow on the display upper eight digit display May be reset to zero via front panel...

Страница 7: ...re classification of Group A propane Group B ethylene Group C hydrogen Having a temperature classification of T1 450ºC T2 300ºC T3 200ºC T4 135ºC T5 100ºC At ambient temperatures between 40 and 70ºC Note The specified operating temperature of the BA337E and BA338E is 40 to 70 C At temperatures below 20 C the instruments will continue to function but the display digits will change more slowly and c...

Страница 8: ...n a hazardous area providing that a The flowmeter is a certified intrinsically safe device having output parameters equal to or less than Uo 28V dc Io 200mA dc Po 0 84W or complies with requirements for simple apparatus b The flowmeter and associated wiring can withstand a 500V rms insulation test to earth c The flowmeter is located in the same hazardous area as the BA337E or BA338E The BA337E and...

Страница 9: ... switch located within the same hazardous area as the BA337E or BA338E Rate Totaliser The switch and associated wiring should be able to withstand a 500V rms insulation test to earth If the reset switch is required in the safe area a Zener barrier or intrinsically safe relay is required to transfer the contact closure into the hazardous area Almost any intrinsically safe relay with certification p...

Страница 10: ...l Fig 2 BA337E or BA338E used with Zener barriers Alternatively the pulse source may be located in the safe area Fig 3 shows how an additional Zener barrier is used to transfer the signal to the rate totaliser in the hazardous area When more than one Zener barrier is used in a system all must have the same polarity i e all positive or all negative barriers When designing a system it is important t...

Страница 11: ... debounce circuit to prevent false triggering Three levels of de bounce protection are independently available See section 6 7 4 1 5 2 wire proximity detector input Most certified intrinsically safe flowmeters incorporating a NAMUR 2 wire proximity detector may be directly connected to a BA337E or BA338E input providing the input safety parameters of the flowmeter proximity detector are equal to o...

Страница 12: ...ed A BA337E or BA338E may also be remotely reset from the safe area Any switch may be used but a Zener barrier is required to transfer the contact closure into the hazardous area which may be combined with the supply barrier so that only one package is required A diode return barrier is not suitable for this application Fig 2 illustrates how a BA337E or BA338E may be reset from both the safe and t...

Страница 13: ... threshold Input transducer Switching thresholds Lower Upper Open collector 2k 10k Voltage pulse low 1 0V 3 0V Voltage pulse high 3 0V 10 0V Magnetic pick off 0mV 40mV peak Proximity detector 1 2mA 2 1mA Switch 100 1000 Switch contacts proximity detectors and open collector sensors require energising which is achieved by linking terminals 3 and 4 together as shown in Figs 4 and 5 4 2 3 Switch cont...

Страница 14: ...it to prevent false triggering of the instrument See section 6 7 4 2 7 Voltage pulse input Two voltage pulse input ranges are independently selectable in the BA337E and BA338E Rate Totalisers configuration menu VoLt5 L and VoLt5 H When configured for either of the voltage pulse ranges and terminals 3 4 are not linked the input terminals 5 6 comply with the requirements for simple apparatus This al...

Страница 15: ...al backlight is internally powered Fig 6A BA337E dimensions terminals Cut out dimensions Recommended for all installations Mandatory to achieve an IP66 seal between the instrument and the panel 136 0 0 5 0 0 x 66 2 0 5 0 0 DIN 43 700 138 0 1 0 0 0 x 68 0 0 7 0 0 Support panel wiring to prevent vibration damage Note Optional backlight is internally powered Fig 6B BA338E dimensions terminals Althoug...

Страница 16: ...ring is supported Fig 7 Fitting panel mounting clamps 5 4 Scale card The Rate 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 8 Thus the scale card can easily be changed without removing the Rate Totaliser from...

Страница 17: ...ng configured totalisation continues so that any flow occurring during this time is recorded 6 1 Configuration structure Fig 9 shows the BA337E and BA338E calibration structure The rate and total display calibrations are independent which allows the displays to have different engineering units The rate totaliser pulse input is divided by FACtor which is usually set to the K factor of the flowmeter...

Страница 18: ...figuration menu is shown diagrammatically in Fig 10 When returning to the totalisation mode following reconfiguration the Rate Totaliser will display dAtA followed by 5AVE while the new information is stored in permanent memory 6 3 Summary of configuration functions This section summarises all the configuration functions When read in conjunction with Fig 10 it provides a quick aid for configuring ...

Страница 19: ...r of litres in 1 000 imperial gallons 5CALE t may be adjusted between 0 0001 and 99999 The total flow display is independent of the rate display See section 6 13 Display Summary of function 5CALE r Rate scale factor 5CALE r is a dividing factor that converts the pulse output from FACtor into the required rate display in engineering units e g if the output from FACtor is one pulse per litre and the...

Страница 20: ...stored See section 6 20 Display Summary of function CLr Gtot Reset grand total from configuration menu This function resets the grand total to zero from within the configuration menu when CLr YE5 is selected and 5urE is entered to confirm the instruction Note Once reset the grand total can not be recovered See section 6 21 CodE Security code Defines a four digit alphanumeric code which must be ent...

Страница 21: ...dEbounCE which configure the Rate Totaliser input and input noise rejection 6 6 Input type inP tYPE inP tYPE is a sub menu in the inPut function which defines the type of flowmeter or input pulse that the Rate Totaliser will count To check or change the type of input select inPut in the main configuration menu and press which will reveal the inP tYPE prompt pressing again will show the Rate Totali...

Страница 22: ...22 ...

Страница 23: ...23 ...

Страница 24: ...tton will scroll through the three levels When the required level has been selected pressing twice will enter the selection and return the display to the inPut prompt in the configuration menu 6 8 Display update interval uPdAtE If either the rate or the total display is likely to change rapidly a longer interval between display updates may simplify reading the Rate Totaliser display This function ...

Страница 25: ...l point that may be positioned between any of the digits or may be omitted by moving it to the right of the least significant digit When set as required press to return to the FACtor prompt in the configuration menu 6 13 Total scale factor 5CALE t 5CALE t is a dividing factor adjustable between 0 0001 and 99999 that enables total flow to be displayed in the required engineering units e g if the ou...

Страница 26: ...splay stability and a fast response to a large rate signal change To check or change the filter select FiLtEr in the configuration menu and press which will reveal the existing settings with the first digit flashing Pressing the or button will change the flashing digit and will transfer control to the second digit While making adjustments the filtered rate display is shown on the lower display so ...

Страница 27: ...on to change the setting followed by the button twice to enter the change and return to the LoC clr prompt in the configuration menu 6 21 Grand total reset from configuration menu Clr Gtot The grand total is a separate sixteen digit counter which is incremented in parallel with the total display but is not zeroed when the total display is reset to zero The grand total may be viewed in the totalisa...

Страница 28: ...f from the configuration menu and press which will result in a 0000 display with the first digit flashing This is a request to confirm the reset to factory default instruction by entering 5urE Using the or button set the flashing digit to 5 and press to transfer control to the second digit which should be set to u When 5urE has been entered pressing the button will reset the BA337E or BA338E to th...

Страница 29: ...alibration certificate specifying the average K factor and the flow range over which it applies For use over extended flow ranges and for non linear devices multiple K factors will be specified often in a table similar to the one shown below Flow Rate Litres min K factor Pulses litre 5 200 10 230 15 239 20 242 From this calibration certificate information the output frequency of the flowmeter whic...

Страница 30: ...30 ...

Страница 31: ...uration menu and press which will reveal one of four sub functions If Add is not displayed repeatedly press the or button to select Add followed by which will cause the current segment and the total number of lineariser segments to be displayed as shown below Each time the push button is operated a segment will be added to the lineariser If configuring the lineariser for the first time repeatedly ...

Страница 32: ...umber of segments that have already been defined using the Add and dEL functions see below The required segment which is shown on the left hand side of the display can be selected using the or push button When selected press which will reveal the current input frequency with one digit flashing The value of the flashing digit may be changed by pressing the or button When this digit is correct press...

Страница 33: ...s example a BA337E Rate Totaliser is connected to a turbine flowmeter having a K factor of 105 pulses per litre with a magnetic pick off The BA337E is required to display rate of flow in imperial gallons per hour with a resolution of one gallon and total flow in cubic metres with a maximum total of 100000 and a resolution of 0 01 cubic metres Linearisation is not required Totalisation is to stop w...

Страница 34: ...e configuration menu and press which will show if the lower display is on or oFF The Rate Totaliser is required to display both total flow and the rate of flow so the lower display is required Using the or button select on and press to enter the selection and return to the di5P 2 prompt in the configuration menu See 6 10 Step 7 Position rate total decimal points Select dP from the configuration me...

Страница 35: ...to be displayed in the required engineering units The rate display timebase is determined by t bA5E that is adjusted in Step 11 In this example the rate of flow display is required in imperial gallons FACtor which was adjusted in Step 8 of this example produces an output in Litres that must be converted to imperial gallons There are 4 5461 Litres in an imperial gallon so 5CALE r should be adjusted...

Страница 36: ...reveal the sub menu Again using the or button select the local total reset function clr tot and press This function is required so using the or button select on followed by to return to the clr tot prompt in the sub menu Using the or button select the local grand total reset function clr gtot and press This function is not required so using the or button select oFF Finally return to the loc clr pr...

Страница 37: ...g 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 BA337E or a BA338E fails after it has been functioning correctly the following table may help to identify the cause of the failure Sympt...

Страница 38: ...actory fitted backlight that produce green illumination enhancing display contrast and enabling it to be read at night or in poor lighting conditions Both the BA337E and BA338E backlights are internally powered from the instrument power supply so that no additional wiring or intrinsically safe interface is required but the instrument supply current increases Current consumption BA337E BA338E Witho...

Страница 39: ...0 84W The maximum equivalent capacitance and inductance between each set of alarm terminals is Ci 22nF Li 4µH To determine the maximum permissible cable parameters Ci should be subtracted from the maximum permitted external capacitance Co specified by the certificate for the intrinsically safe interface powering the alarm circuit such as the solenoid driver and switch transfer galvanic isolators s...

Страница 40: ...yed followed by which will reveal if the function is on or off The setting can be changed by pressing the or push button followed by the button to return to the alarm sub menu 10 4 5 Type of alarm tYPE Alarm 1 and Alarm 2 are totally independent both may be rate or total alarms or one may be conditioned for rate and the other for total Using the or push button select tYPE from the selected alarm s...

Страница 41: ...41 ...

Страница 42: ...ess to enter the value and return to the dELA prompt in the alarm sub menu The Rate Totaliser s alarm annunciator will start flashing immediately an alarm condition occurs and will continue for the delay time after which the alarm output will be activated and the alarm annunciator will be permanently activated 10 4 11 Alarm silence time 5IL The alarm silence function is primarily intended for use ...

Страница 43: ...tained by operating the and push buttons simultaneously as shown in Fig 16 If the setpoints are not protected by a security code the alarm setpoint prompt 5P1r or 5P1t will be displayed depending upon whether a rate or total alarm has been conditioned If access to the setpoints is protected by a security code CodE will be displayed first Pressing again will allow the alarm setpoint security code t...

Страница 44: ...output circuit to be used 10 5 2 System design The Rate Totalisers pulse output is a passive circuit i e not powered but it is totally isolated from all other Rate Totaliser circuits Subject to complying with intrinsic safety interconnection requirements the terminals P1 and P2 may be connected to another instrument with an open collector input The pulse output may also be transferred to the safe ...

Страница 45: ...om 5CALEd Incrementation of least significant digit of the total display May be divided and width defined by the diVidE and durAtion functions to generate the required output pulse dirECt Output is synchronous duplicate of the Rate Totaliser input pulse Using the or push button select 5ourCE in the pulse output sub menu and press to reveal the existing pulse source The function can be changed by p...

Страница 46: ... not exceed Uo 28V dc Io 200mA dc Po 0 84W The maximum equivalent capacitance and inductance of the 4 20mA output output is Ci 2 2nF Li 4µH To determine the maximum permissible cable parameters these figures should be subtracted from the maximum cable capacitance and inductance specified by the certificate for the Zener barrier or galvanic isolator powering the 4 20mA output circuit 10 6 2 System ...

Страница 47: ...ton select 4 000 in the 4 20mA output sub menu and press which will reveal the existing rate or total display with one digit flashing The required display can be entered using the or push button to adjust the flashing digit and the button to transfer control to the next digit When set as required press to enter the value and return to the 4 000 prompt in the 4 20mA output sub menu 10 6 8 Display w...

Страница 48: ...tificate may be downloaded from www beka co uk www iecex com or requested from the BEKA sales office A1 2 Installation The IECEx intrinsic safety parameters are identical to the ATEX safety parameters described in the main section of this manual and both refer to the same standards Therefore the ATEX installation requirements specified in section 3 4 and 5 of this manual may be used for IECEx inst...

Страница 49: ...rs the systems shown in sections 3 and 4 of this manual may therefore also be used for US and Canadian installations subject to compliance with the local codes of practice ETL and cETL intrinsic safety codes CL I Div 1 Groups A B C D T5 US IS gas Div cert CL II Div 1 Groups E F G CL III US IS dust Div cert CL I Zone 0 AEx ia IIC T5 Ga US IS gas Zone cert Ex ia IIC T5 Ga Canadian IS gas Zone cert 4...

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