BEKA BA334E, Руководство пользователя, Страница: 4 / 64

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1. DESCRIPTION
These intrinsically safe, one input rate totalisers are
primarily intended for use with a pulse output
flowmeter. The BA334G and the BA334E are
functionally identical and have similar certifications,
but differ in mechanical construction and options.
The differences are summarised in the following
table.
BA334G BA334E
Separate terminal
compartment.
No Yes
Pulse output Yes Yes
Backlight Option Yes
4/20mA output. Option Yes
Dual alarms Option Yes
Certification
IECEx Gas & dust Gas
ATEX Gas & dust Gas
ETL & cETL Gas & dust Gas & dust
The main sections of this instruction manual
describe the BA334G, but also apply to the BA334E.
Details of the BA334E mounting and terminals are
contained in Appendix 4.
The BA334G and BA334E have been ATEX certified
intrinsically safe by Notified Body Intertek Testing
and Certification Ltd and comply with the European
ATEX Directive 2014/34/EU. The BA334G has gas
and dust certification, but the BA334E only has
ATEX gas certification.
The main sections of this manual describe ATEX
gas certification.
For international applications the BA334G and
BA334E also have IECEx certification which is
described in Appendix 2. The BA334E does not
have IECEx dust certification.
For applications in the USA and Canada the
BA334G and BA334E have ETL & cETL certification
which is described in Appendix 3.
The BA334G and BA334E simultaneously display
the rate of flow and the total flow in the same or
different engineering units. The instruments are
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.
2. OPERATION
Fig 1 shows a simplified block diagram of the
BA334G Rate Totaliser. The instrument can
accept pulses from most flowmeter transducers.
When connected to a pulse output flowmeter the
BA334G 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 BA334G 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 BA334G block diagram