BEKA BA337NE User manual

Issue: 7
9th July 2019
BA337NE
Rugged one input
Ex nA and Ex tc
Rate Totaliser
Issue 7

1. Description
2. Operation
2.1 Initialisation
2.2 Controls
2.3 Displays
2.3.1 Display over-range
3. Certification
3.1 ATEX Ex nA certification
3.2 Zones, gas groups & T rating
3.3 Special conditions for safe use
3.4 Power supply
3.5 Pulse input
3.6 Remote reset terminals
3.7 Certification label information
4. System Design for Hazardous Areas
4.1 Power supply
4.2 Pulse input
4.2.1 Input switching thresholds
4.2.2 Switch contact input
4.2.3 Open collector input
4.2.4 2-wire proximity detector input
4.2.5 Magnetic pick-off input
4.2.6 Voltage pulse input
4.3 Remote reset
5. Installation
5.1 Location
5.2 Installation procdedure
5.3 Rate Totaliser earthing
5.4 EMC
5.5 Scale card
6. Configuration and Calibration
6.1 Configuration structure
6.2 Accessing configuration functions
6.3 Summary 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 Clip-off: clp off
6.18 Local reset: loc clr
6.19 Local total reset: clr tot
6.20 Local grand total reset: clr gtot
6.21 Grand total reset from configuration menu:
clr gtot
6.22 Security code: code
6.23 Reset to factory defaults: r5et def
7. Lineariser
7.1 Flowmeter specification
7.2 Summary of lineariser configuration
functions.
7.3 Add a segment: add
7.4 Remove a segment: del
7.5 Input frequency: pul5efre
7.6 K-factors: l-factor
7.7 Lineariser error messages
8. Configuration example
8.1 Configuration procedure
9. Maintenance
9.1 Fault finding during commissioning
9.2 Fault finding after commissioning
9.3 Servicing
9.4 Routine maintenance
9.5 Guarantee
9.6 Customer comments
222222222222222222222222
The BA337NE is CE marked to show compliance with the European Explosive Atmospheres Directive
2014/34/EU and the European EMC Directive 2014/30/EU
CONTENTS

10. Accessories
10.1 Scale card
10.2 Tag information
10.3 Backlight
10.4 Alarms
10.4.1 Solid state output
10.4.2 Ex nA certification
10.4.3 Summary of configuration functions
10.4.4 Alarm enable: enbl
10.4.5 Type of alarm: type
10.4.6 Setpoint adjustment: 5p1x and 5p2x
10.4.7 Alarm function: hi.lo
10.4.8 Alarm output status: no.nc
10.4.9 Hysteresis: h5tr
10.4.10 Alarm delay: dela
10.4.11 Alarm silence time: 5il
10.4.12 Flash display: fl5h
10.4.13 Access setpoint: ac5p
10.4.14 Adjusting alarm setpoints
from totalisation mode:
10.5 Pulse Output
10.5.1 Ex nA certification
10.5.2 Pulse output configuration
10.5.3 Enable pulse output: enbl
10.5.4 Source of pulse output: 5ource
10.5.5 Divide output pulse frequency:
dividE
10.5.6 Output pulse width: duration
10.5.7 Pulse storage
10.6 4/20mA output
10.6.1 Ex nA certification
10.6.2 Configuration
10.6.3 4/20mA output: 4-20op
10.6.4 Enable 4/20mA output:EnbL
10.6.5 Select rate or total source: 4-
20type
10.6.6 Display for 4mA output: 4.000
10.6.7 Display for 20mA output: 20 .000
Appendix 1 Dust certification
Appendix 2 IECEx certification
Appendix 3 ETL and cETL certification
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CONTENTS CONTINUED

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1. DESCRIPTION
The BA337NE is an Ex nA and Ex tc certified, panel
mounting, pulse input rate totaliser primarily intended
for use with flowmeters in Zones 2 or 22. The
instrument simultaneously displays the rate of flow
and the total flow in the same or different engineering
units. It is controlled and configured via the four
front panel push buttons, a user defined four digit
code may be entered to prevent accidental access to
the instrument's configuration menu.
This instruction manual supplements the abbreviated
instruction sheet supplied with each instrument.
The BA337NE has been issued with a Type
Examination Certificate ITS16ATEX48409X by
Notified Body Intertek Testing and Certification Ltd.
This confirms compliance with the type of protection
requirements for non-sparking Ex nA apparatus, and
for dust ignition protection by enclosure Ex tc. This
certificate has been used to confirm compliance with
the European ATEX Directive 2014/34/EU.
For international applications the BA337NE also has
IECEx certification which is described in Appendix 2.
For application in the USA or Canada the BA337NE
has ETL and cETL certification, see Appendix 3.
2. OPERATION
Fig 1 shows a simplified block diagram of the
BA337NE Rate Totaliser. The instrument can accept
pulses from most flowmeter transducers. When
connected to a pulse output flowmeter the BA337NE
will provide an accurate display of the rate of flow 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 BA337NE has a single pair of input terminals 5 &
6 for connection to all types of transducer. When
counting pulses from a transducer requiring
energising, such as a switch contact, open collector
or a two wire proximity detector, an external link
between terminals 3 and 4 supplies power to the
transducer input terminals.
Factory fitted accessories include an internally
powered display backlight and one of three isolated
output options, dual alarms, a pulse or a 4/20mA
output.
Fig 1 BA337NE block diagram
2.1 Initialisation
Each time power is applied to the Rate Totaliser
initialisation is performed. After a short delay the
following display sequence occurs:
All segments of the display are activated
Instrument starts functioning using the
configuration information stored in permanent
memory. Unless total and grand total displays
have been reset to zero, new flow will be
added to the existing totals.
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2.2 Controls
The BA337NE is controlled and configured via four
front panel push buttons. In the totalisation mode
i.e. when the instrument is displaying rate and total
flow the push button functions are:
Push Button Functions
) + &Grand total - shows Lo followed by least
significant 8 digits of the 16 digit grand
total.
)+ *Grand total - shows Hi followed by the
most significant 8 digits of the 16 digit
grand total.
If Local Grand Total Reset CLr Gtot in
the instrument configuration menu has
been activated, operating the )+ *
buttons for ten seconds will result in
Clr.no being displayed with the no
flashing. Operating the &or *button
will change the display to CLr–.–YE5, the
)button will then reset the grand total
to zero which will be confirmed by a brief
display of Gt Clrd. See 6.20
&+ * If Local Total Reset CLr tot in the
instrument configuration menu has been
activated, operating the &+ *buttons
simultaneously for three seconds will
reset the total display to zero and clear
any pulses stored in the optional pulse
output.
The Grand Total is not reset.
See 6.19
(+ &Shows in succession, firmware version
number, instrument function totali5e
and any output accessories that are
fitted:
- A Dual alarm outputs
- P Pulse output
- C 4/20mA output
( + *Provides direct access to the alarm
setpoints 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 BA337NE has two digital displays and
associated annunciators, plus a flow indicator as
shown on the front cover of this manual.
Total Shows the total flow on the
display upper eight digit display. May
be reset to zero via front panel
push buttons or by a remote
reset switch.
Rate Shows the flow rate on the
Display lower six digit display.
Flow This disc in the lower left
indicator hand corner of the display
'rotates' for two seconds each
time an input pulse is received.
Appears to rotate continuously
when input frequency exceeds
0.5Hz.
Hold Activated when input
annunciator frequency is below the clip-off
threshold.
Reset Activated while instrument is
annunciator being reset via the front panel
push buttons, or the external
reset terminals.
Rate Identifies rate display
annunciator
Total Identifies total display
annunciator
RTx Retransmitted pulse
annunciator annunciator.
Depends upon the setting of
5ource in the pulse output
configuration menu.
5caled:
Annunciator activated each
time pulse output open
collector is on, i.e. Ron is
less than 60+ 3V.
direct:
Annunciator continuously
activated.
2.3.1 Display over-range
Over-range of the upper eight digit display or the
lower six digit display is indicated by all the digits
displaying 9and all the decimal points flashing.
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3. CERTIFICATION
The BA337NE has ATEX and IECEx Ex nA gas and
Ex tc dust certification. The main sections of this
instruction manual describes ATEX gas certification.
ATEX dust certification is described in Appendix 1
and IECEx gas and dust certification in Appendix 2.
3.1 ATEX Ex nA certification
Notified Body Intertek Testing and Certification Ltd
have issued the BA337NE with a Type Examination
Certificate number ITS16ATEX48409X. This has
been used to confirm compliance with the European
ATEX Directive for Group II, Category 3G equipment.
The instrument carries the Community Mark and,
subject to local codes of practice, may be installed in
any of the European Economic Area (EEA) member
countries and in the EEA EFTA states, Iceland,
Liechtenstein and Norway. ATEX certificates are also
acceptable in Switzerland and Turkey. The
European Commission's Blue Guide lists the member
states, overseas countries and territories that have
adopted harmonisation legislation.
This section of the instruction manual describes
ATEX installations in explosive gas atmospheres
conforming with EN 60079-14 Electrical installations
design, selection and erection. When designing
systems for installation outside the UK the local Code
of Practice should be consulted.
3.2 Zones, gas groups and T rating
The Rate Totaliser has been certified as Group II
Category 3G Ex ic nA IIC T5 Gc –40°C Ta +60°C
apparatus. This is non-sparking apparatus complying
with EN 60079-15 Equipment protection by type of
protection 'n' that minimises the risk of arcs or sparks
capable of creating an ignition hazard occurring
during conditions of normal operation.
The Rate Totaliser's front panel push button contacts
are non incendive and have been certified intrinsically
safe Ex ic without an external Zener barrier or
galvanic isolator, as shown on the Type Examination
Certificate. This allows the Rate Totaliser to be
adjusted and configured live when installed in a Ex n
panel enclosure located in Zones 2.
When connected to a suitable system and correctly
mounted in a panel enclosure complying with the
requirements for Type of protection 'n', the panel
enclosure containing the BA337NE Rate Totaliser
may be installed in:
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
In gases that may safely be used with equipment
having a temperature classification of:
T1 450oC
T2 300oC
T3 200oC
T4 135oC
T5 100oC
At ambient temperatures between -40 and +60oC.
This allows use with all commonly used industrial
gases except carbon disulphide CS2.
3.3 Special conditions for safe use
Special conditions for safe use are specified by the
Ex nA certificate indicated by the certificate number's
'X' suffix. These state that the BA337NE Rate
Totaliser should be:
a. Mounted such that the instrument terminals are
protected by at least an IP54 enclosure
certified to IEC 60079-0 or IEC 60079-15 as
appropriate.
b. Be supplied from limited energy circuits with
output parameters in normal operation equal
to, or less than the instruments input
parameters.
These special conditions for safe use can be satisfied
by mounting the BA337NE in an Ex n, Ex e or Ex p
panel enclosure. For ATEX Category 3 installations
in Zone 2, self or third party certified Ex n, Ex e or
Ex p panel enclosures may be used. Additional
requirement apply for non-metallic panel enclosures.
3.4 Power supply
The input safety parameters for the power supply
terminals 1 and 2 are:
Ui = 30dc
Ii = 100mA
This allows the BA337NE to be powered from any dc
supply which in normal operation has an output
voltage of less than 30V. See section 4.1 for power
supply recommendations.
3.5 Pulse input
The BA337NE Rate Totalisers has a single pair of
pulse input terminals 5 and 6 that may be configured
for use with different types of sensor.
For sensors that require energising to determine their
state, such as switch contacts or a 2-wire proximity
detector, an external link between terminals 3 & 4 of
the BA337NE connects an internal 7V, 6mA supply to
the input terminals.
7

Energising is not required when the Rate Totaliser
input is connected to a voltage pulse source.
Fitting an external link between terminals 3 & 4
changes the Rate Totaliser's pulse input safety
parameters in normal operation as shown below.
This table also shows the types of sensor requiring
energising (link fitting).
Safety parameters
Input Output
Type of input Link 3 & 4 Ui Uo Io
Switch contact Yes 15V 10.5V 9.2mA
Proximity detector Yes 15V 10.5V 9.2mA
Open collector Yes 15V 10.5V 9.2mA
Magnetic pick-off No 30V 1.1V 0.5mA
Voltage input (low) No 30V 1.1V 0.5mA
Voltage input (high) No 30V 1.1V 0.5mA
3.6 Remote reset terminals
The BA337NE total display my be reset to zero by
connecting the external reset terminals RS1 and RS2
together for more than one second. The two reset
terminals have the following safety parameters in
normal operation:
Ui = 30V
Uo = 3.8V
Io = 1mA
3.7 Certification label information
The Rate Totaliser certification information label is
fitted in a recess on the top outer surface of the
enclosure. It shows the ATEX and IECEx certification
information plus BEKA associates name, location,
year of manufacture and the instrument serial
number.
BA337NE Certification information label
4. SYSTEM DESIGN FOR HAZARDOUS AREAS
When correctly installed in Zone 2 the BA337NE
Rate Totaliser may be connected to almost any
apparatus in the safe area and to Ex n, Ex e, Ex p
and Ex d protected apparatus located in Zone 2.
Because the BA337NE is not certified intrinsically
safe it should not be connected to an intrinsically safe
system.
BEKA Application Guide AG310, Guide for
Installation of [extra low voltage d.c.] Ex nA
instrumentation, which can be downloaded from
www.beka.co.uk, contains explanations and
recommendations for the installation of Ex nA
equipment.
In addition to being able to be connected to other
equipment in the safe area and in Zone 2, the
BA337NE may also be connected to suitably
protected and certified equipment located in Zone 1.
This is illustrated in Fig 5 and explained in
Application Guide AG310.
There are four design requirements:
1. The BA337NE must be installed in a panel
enclosure complying with the requirements for
Ex n protection as shown in section 5 of this
manual.
2. The BA337NE should be powered from a
circuit that has output safety parameters in
normal operation equal to, or less than, the
input safety parameters for terminals 1 and
2 specified by the BA337NE ATEX Type
Examination Certificate.
3. Hazardous area apparatus to which the
BA337NE is connected should be protected
by a technique suitable for the Zone in
which the equipment is located such as Ex n
or Ex e if located in Zone 2. Equipment
protected by intrinsic safety should not be
connected to a BA337NE.
4. Wiring should comply with Clause 9 of
EN 60079-14.
When designing a system it is important to remember
that terminals 2, 6 and RS2 are interconnected within
the BA337NE. See Fig 1.
4.1 Power supply
The BA337NE Rate Totaliser require a minimum of
10V between terminal 1 & 2 and consumes:
10mA without optional backlight
plus 6mA when terminals 3 & 4 are linked
A 24V dc regulated supply with a current limit located
in a safe area is suitable.
8

The power supply should meet the requirements for
personnel safety so that ‘live maintenance’ can safely
be performed. The implicit requirement for galvanic
isolation from the mains supply ensures that the
possible difficulties from circulating earth currents
caused by mains faults is minimised. In European
terms if the power supply is CE marked it is almost
certainly acceptable.
To comply with the requirements of EN 60079:14
Electrical installations design, selection and erection,
each of the wires entering the hazardous area should
be individually fused and contain a means of
isolation. These two requirements may be satisfied
by using DIN rail mounted terminals incorporating a
fuse with easily removable fuses which can be
extracted to achieve isolation as shown in Fig 2.
Clear identification of, and easy access to the means
of isolation is essential for their effective use. It is
also necessary to ensure that the maintenance
procedure makes sure that unauthorised re-closure
of the switches does not occur. It is not considered
necessary to have a means of isolation or electrical
protection for the screen.
Fig 2 DIN rail mounting terminals incorporating a
fuse
For some applications Ex nA instrumentation
energised by a current limited power supply or
instrument that can be switched off, is considered
adequate and to comply with the requirements of the
standard.
4.2 Pulse input
The BA337NE can display the rate and total flow
from flowmeters with a wide variety of pulse outputs
located in a Zone 2 hazardous areas or in a safe
area. Fig 3 shows the connections when the
flowmeter is located in Zone 2 and Fig 4 the
connections required when the flowmeter is in a safe
area.
Fig 3 Connections for flowmeter sensor in Zone 2
Fig 4 Connections for flowmeter sensor in safe area
Providing the BA337NE Rate Totaliser is correctly
installed in an Ex n panel enclosure located in Zone
2, the input terminals may be connected to a certified
flowmeter sensor located in Zone 1 as shown in Fig
5. The flowmeter sensor should have Ex e or Ex d
certification permitting installation in Zone 1.
Intrinsically safe Ex i certified flowmeter sensors
should not be used.
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Fig 5 Connection to an Ex d or Ex e flowmeter in
Zone 1
4.2.1 Input switching thresholds
For reliable totalisation the Rate Totaliser pulse input
must fall below the lower threshold and rise above
the upper thresholds shown in the following table.
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
Flowmeters with a switch contact, proximity detector
or an open collector output require energising which
is achieved by linking Rate Totaliser terminals 3 & 4.
4.2.2 Switch contact input
Any flowmeter with a mechanically or magnetically
activated switch contact located in Zone 2 or in the
safe area may be directly connected to pulse input
terminals 5 and 6 which are non incendive, providing
the flowmeter and associated wiring can withstand a
500V rms insulation test to earth. Most magnetically
activated reed relays used in turbine flowmeters
comply with these requirements. The BA337NE
contains a configurable debounce circuit to prevent
contact bounce being counted. See section 6.7.
4.2.3 Open collector input
Flowmeters with an open collector output located in
Zone 2 or in the safe area may be directly connected
to input terminals 5 & 6 providing the flowmeter and
associated wiring can withstand a 500V rms
insulation test to earth.
The BA337NE contain a configurable debounce
circuit to prevent false triggering. See section 6.7.
4.2.4 2-wire proximity detector input
Most Zone 2 certified flowmeters incorporating a
NAMUR 2-wire proximity detector may be directly
connected to a BA337NE input terminals 5 & 6
providing minimum operating voltage is greater than
7.5V. The flowmeter and the associated wiring
should be able to withstand a 500V rms insulation
test to earth.
The BA337NE contain a configurable debounce
circuit to prevent false triggering. See section 6.7.
4.2.5 Magnetic pick-off input
Flowmeters incorporating a magnetic pick-off to
sense flow will usually have a low level ac voltage
output which a BA337NE Rate Totaliser can sense
when configured for a CoiL input. The Rate Totaliser
input terminals 5 and 6 may be connected to any
Zone 2 certified magnetic pick-off output flowmeter,
providing the output in normal operation is equal to or
less than 30V the Rate Totaliser's Ui. The flowmeter
and associated wiring should be able to withstand a
500V rms insulation test to earth.
The BA337NE contain a configurable debounce
circuit to prevent false triggering. See section 6.7.
4.2.6 Voltage pulse input
Two voltage pulse input ranges are selectable in the
BA337NE Rate Totaliser configuration menu, VoLt5
Land VoLt5 H. The Rate Totaliser input terminals 5
and 6 may be connected to any Zone 2 certified
voltage pulse output flowmeter, providing the output
in normal operation is equal to or less than 30V the
Rate Totaliser's Ui. The flowmeter and associated
wiring should be able to withstand a 500V rms
insulation test to earth.
The BA337NE contain a configurable debounce
circuit to prevent false triggering. See section 6.7.
4.3 Remote reset
The BA337NE Rate Totaliser's total display may be
remotely reset to zero by connecting terminals RS1
and RS2 together. Permanent interconnection
inhibits totalisation. Remote resetting may be
accomplished by any mechanically operated switch
located in Zone 2 as the Rate Totaliser's reset circuit
is non incendive. The reset switch and the
associated wiring should be able to withstand a 500V
rms insulation test to earth.
A BA337NE may also be remotely reset from the safe
area. Any switch may be used. Fig 4 illustrates how
a BA337NE may be reset from both the safe and the
hazardous area.
The BA337NE total display may also be reset when
the &and *push buttons are operated
simultaneously in the totalising mode i.e. when the
instrument is displaying flow. See 6.19
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