23
8.3 Servicing
ENSURE PLANT SAFETY BEFORE
STARTING MAINTENANCE
Live maintenance should only be
performed when there is no risk of a
flammable atmosphere being present,
and dust or water can not enter the
enclosure. De-energise the 4/20mA loop
and power to the optional backlight and
relay contacts before starting any
maintenance.
Before replacing control and terminal
covers ensure that the sealing gskets are
undamaged and are free from dirt and
foreign bodies.
To simplify servicing all BA354ND rate totaliser
use a common display assembly which may be
replaced on site. Depending upon the
accessories fitted, one spare display assembly
may be used to repair any BA354ND rate totaliser
which fails.
To replace the display assembly remove the
terminal cover by unscrewing the two 'A' screws
which will reveal two concealed 'D' screws.
Unscrew all four 'D' screws and carefully lift off the
front of the instrument as shown in Fig 4. The
instrument assembly is secured by four Pozi
headed screws which should be removed. If the
instrument is fitted with a backlight or alarms the
fly-leads connecting the accessory boards to the
terminals should be un-plugged. The replacement
display assembly may then be installed and the
enclosure reassembled.
If after replacement of the display assembly the
instrument still does not function, it is likely that the
fault is within the protection components on the
terminal assembly. Terminal assemblies may be
exchanged on-site providing the replacement
includes terminals for any accessories fitted to the
display assembly i.e. terminals for backlight and
alarms.
We recommend that faulty instruments and
instrument assemblies are returned to BEKA
associates or to our local agent for repair.
8.4 Routine maintenance
The mechanical condition of the instrument and
electrical calibration should be regularly checked.
The interval between inspections depends upon
environmental conditions. We recommend that
initially instrument calibration should be checked
annually.
8.5 Guarantee
Indicators which fail within the guarantee period
should be returned to BEKA associates or our local
agent. It is helpful if a brief description of the fault
symptoms is provided.
8.6 Customer comments
BEKA associates is always pleased to receive
comments from customers about our products and
services. All communications are acknowledged
and whenever possible, suggestions are
implemented.
