BEKA BA344D, Manual

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2.2 Displays
The BA344D has two digital displays and
associated annunciators, plus a flow indicator
as shown on page 1.
Rate Shows the flow rate on the
Display smaller six digit display.
Total Shows the total flow on the
display larger eight digit display. Set
to zero when local or remote
reset switch is operated.
Flow This disc in the lower left
indicator hand corner of the display
'rotates' while input pulses are
being received. It will stop
rotating within two seconds of
the end of a display update
period in which no pulses were
received.
Hold Activated when input
annunciator frequency is below the clip-off
threshold.
Low battery Battery symbol containing
Annunciator word ‘LO’ is a ctivated when
internal battery requires
replacement.
3. INTRINSIC SAFETY CERTIFICATION
3.1 ATEX certificate
The BA344D has been issued with an EC-Type
Examination Certificate by Notified Body ITS
Testing & Certification Ltd (ITS) confirming
compliance with the European ATEX Directive
94/9/EC for Group II, Category 1, gas and dust
atmospheres, EEx ia IIC T5. The instrument
bears the Community Mark and, subject to
local codes of practice, may be installed in any
of the European Economic Area (EEA)
member countries. ATEX certificates are also
acceptable for installations in Switzerland.
This manual describes installations in
explosive gas atmospheres which conform with
BS EN60079:Part14:2003 Electrical Installation
in Hazardous Areas. When designing systems
for installation outside the UK, the local Code
of Practice should be consulted.
For the use in the presence of combustible
gas, please refer to Appendix 1 which
describes installations complying with BS EN
50281-1-2:1999.
3.2 Internal battery
The BA344D is powered by a replaceable
lithium battery that is mounted within the
instrument. This will operate the BA344D for
about five years, the exact time depends upon
how the instrument is programmed and used,
whether alarms are fitted and the input pulse
frequency. A low battery alarm annuciator on
the instrument display will be activated when
the battery requires replacing. Normally the
rate totaliser will continue to operate for about
five hundred hours after the annunciator is
activated, but the exact time will depend upon
how the instrument is programmed, whether
alarms are fitted and the input frequency.
During this period the total and grand total will
continue to be transferred to permanent
memory once per hour. When the battery is
exhausted the instrument will display ‘bAtt’ and
stop functioning.
WARNING
To maintain the BA344D ATEX
certification, only a BEKA type
BA491 battery should be installed
in the instrument. No attempt
should be made to recharge an
exhausted battery or to open the
battery assembly.
A replacement battery may be installed while
the BA344D is mounted within the hazardous
area. See section 5.4 for detailed instructions.