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1. DESCRIPTION
The BA384NG is an Ex nA and Ex tc certified, field
mounting rate totaliser with two pulse inputs,
primarily intended for use with two flowmeters in
Zones 2 or 22.
The BA384NG simultaneously displays the rate of
flow and the total flow in the same or different
engineering units. Either input, or their sum or
difference may be shown. The BA384NG 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.
The BA384NG 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.
The main sections of this manual describe ATEX
Ex nA gas certification. Ex tc dust certification is
described in Appendix 1.
For international applications the BA384NG also has
IECEx certification which is described in Appendix 2.
For applications in the USA and Canada the
BA384NG has ETL & cETL certification which is
described in Appendix 3.
This instruction manual supplements the
abbreviated instruction sheet supplied with each
instrument.
2. OPERATION
Fig 1 shows a simplified block diagram of the
BA384NG Rate Totaliser. The instrument has two
separate inputs 'A' and 'b' which can accept pulses
from two flowmeters and display the individual rates
and totals, or the sum or difference of the two rates
and totals.
Each input may be individually configured to accept
pulses from a wide variety of flowmeter sensors and
to display the rate of flow and the total flow in the
same or different engineering units.
When the flowmeter sensors requires energising to
determine their state, such as a switch contact, open
collector or a two wire proximity detector, an external
link connected between BA384NG terminals
supplies power to the appropriate input.
Each Rate Totaliser channel has a separate
lineariser with up to sixteen straight-line segments
that may be configured to compensate for flowmeter
non-linearity.
The BA384NG Rate Totaliser has an isolated pulse
output which may be configured to synchronously
retransmit either of the two pulse inputs, or a
scaleable pulse when the least significant digit of
total display is incremented.
The following factory fitted accessories are
available:
Internally powered display backlight
Dual isolated alarm outputs
Isolated 4/20mA current sink output
Fig 1 BA384NG Rate Totaliser block diagram
