BEKA BA334NG User manual

Issue: 5
9th July 2019
BA334NG
Ex nA and Ex tc
Externally powered
Rate Totaliser
Issue 5

2
1. Description
2. Operation
2.1 Initialisation
2.2 Controls
2.3 Displays
2.4 Display over-range
3. Certification
3.1 ATEX Ex nA certification
3.2 Zones, gas groups & T rating
3.3 Safety parameters
3.4 Special conditions for safe use
3.5 Power supply
3.6 Pulse input
3.7 Remote reset terminals
3.8 Certification label information
4. System design for gas 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 procedure
5.3 EMC
5.4 Units of measurement and tag marking
on 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
6.24 Pulse output
6.24.1 Ex nA certification
6.24.2 System design
6.24.3 Configuration
6.24.4 Pulse output
6.24.5 Enable pulse output
6.24.6 Source of output pulse
6.24.7 Divide output pulse frequency
6.24.8 Output pulse width
6.24.9 Pulse storage
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 Flowmeter K-factors: l-factor
7.7 Lineariser error messages
8. Configuration example
8.1 Configuration procedure
CONTENTS
The BA334NG is CE marked to show compliance with the European Explosive Atmospheres Directive
2014/34/EU and the European EMC Directive 2014/30/EU

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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
10. Accessories
10.1 Units of measurement and
instrument identification.
10.2 Backlight
10.3 Alarms
10.3.1 Solid state output
10.3.2 Ex nA certification
10.3.3 Configuration and adjustment
10.3.4 Alarm enable: enbl
10.3.5 Type of alarm: type
10.3.6 Setpoint adjustment: 5p1x and 5p2x
10.3.7 Alarm function: hi.lo
10.3.8 Alarm output status: no.nc
10.3.9 Hysteresis: h5tr
10.3.10 Alarm delay: dela
10.3.11 Alarm silence time: 5il
10.3.12 Flash display: fl5h
10.3.13 Access setpoint: ac5p
10.3.14 Adjusting alarm setpoints
from totalisation mode:
10.4 4/20mA output
10.4.1 Ex nA certification
10.4.2 Configuration
10.4.3 4/20mA output: 4-20op
10.4.4 Enable 4/20mA output: enbl
10.4.5 Select rate or total source
: 4-20type
10.4.6 Display for 4mA output: 4.000
10.4.7 Display for 20mA output: 20 .000
Appendix 1 ATEX dust certification
Appendix 2 IECEx gas and dust certification
Appendix 3 ETL & cETL certification for
installation in USA and Canada.

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1. DESCRIPTION
The BA334NG is an Ex nA and Ex tc certified, field
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 BA334NG 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 BA334NG also has
IECEx certification which is described in Appendix 2.
For applications in the USA and Canada the
BA334NG has ETL and cETL approval, see
Appendix 3.
2. OPERATION
Fig 1 shows a simplified block diagram of the
BA334NG Rate Totaliser. The instrument can
accept pulses from most flowmeter transducers.
When connected to a pulse output flowmeter the
BA334NG 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 BA334NG has a single pair of input terminals
for connection to all types of sensor. When
counting pulses from a sensor 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.
Factory fitted accessories include an internally
powered display backlight, dual alarms and an
isolated 4/20mA output which may be configured to
retransmit the rate or total display.
Fig 1 BA334NG block diagram

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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.
2.2 Controls
The BA334NG 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 )
and *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 &and
*buttons 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 (always fitted)
- 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 10.3.13
(+ )Access to configuration menu