6
e. If the instrument is about to be
commissioned, turn the BA544D ON by
moving the slide switch located above
terminals 3 and 4 to the right. See Figs 3
& 4.
Note:
If the instrument has not been
switched on recently it may take a few
minutes to start functioning. If the
instrument does not start, please refer to
the battery configuration instructions in
Appendix 2.
f. Replace the instrument terminal cover
and evenly tighten the two 'A' screws.
Fig 3 BA544D installation procedure
4.3 EMC
The BA544D complies with the requirements of
the European EMC Directive 2004/108/EC.
For specified immunity all wiring should be in
screened twisted pairs. The BA544D earth
terminal should be locally earthed or connected
to an earthed cable screen.
To prevent circulating currents, cable screens
should only be earthed at one point.
Fig 4 Dimensions and terminal connections
4.4 Installing a replacement battery
The internal battery will power the BA544D rate
totaliser for about five years; the exact time
depends upon how the instrument is
programmed and the input pulse frequency.
When the battery requires replacing the low
battery alarm annunciator on the instrument
display will be activated indicating that the rate
totaliser will continue to operate for about
another five hundred hours. When the battery
is exhausted the total and grand total will be
stored in permanent memory, totalisation will
stop and the instrument will display ‘bAtt’.
Replacement batteries are available from
BEKA associates and our agents. When not
installed in an instrument, at 20
o
C the battery
only loses about one percent of its charge each
year, so it is practical to hold spares on-site.
This long shelf life results from an oxide layer
which forms on the battery internal electrodes
and may need clearing before use – see 4.3e
and Appendix 1.
