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If a BA474ND fails after it has been functioning
correctly the following procedure should be followed:
Symptom
Cause
Check
No display or
output current
Wiring or power
supply fault.
Wiring
That voltage
between terminals
5 & 6 is between 9
& 30V. Terminal 5
positive.
or
15 .5 & 30V if
optional backlight
is fitted.
Digital display &
bargraph flashing
and 4/20mA fixed
at 3.6, 3.8 or
21.0mA
Sensor fault
detection has
been activated.
Sensor and input
wiring.
If this procedure does not reveal the cause of the
fault we recommend that the transmitter is replaced.
9.3
Servicing
We recommend that faulty BA474ND indicating
temperature transmitters are returned to BEKA
associates or to our local agent for repair.
9.4 Routine maintenance
The mechanical and electrical condition of the
transmitter should be regularly checked. Initially an
annual inspection is recommended, but the
inspection frequency should be adjusted to suit the
environmental conditions.
9.5 Guarantee
Transmitters 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.
9.6 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.
ACCESSORIES
10.1 Scale and tag marking
BA474ND indicating temperature transmitters are
fitted with a blank escutcheon around the liquid
crystal display. If specified when the transmitter is
ordered, this can be supplied printed with the units of
measurement and tag information, plus a scale for
the horizontal bargraph. Alternatively, information
may be added on-site via an embossed strip, dry
transfer or a permanent marker.
To gain access to the display escutcheon 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. The location of these screws
is shown in Fig 4.
After adding the required legends, or fitting a new
pre-printed self-adhesive escutcheon, ensure that the
gasket is correctly positioned and undamaged before
reassembling the instrument enclosure.
10.2 Tag plate
The BA474ND can be supplied with a blank or
custom laser marked stainless steel plate secured by
two screws to the front of the instrument enclosure.
This plate can accommodate:
1 row of 9 alphanumeric characters 10mm high
or 1 row of 11 alphanumeric characters 7mm high
or 2 rows of 18 alphanumeric characters 5mm
high
10.3 Pipe mounting kits
Two pipe mounting kits are available for securing the
BA474ND to a horizontal or vertical pipe.
BA392D Stainless steel bracket secured by two
worm drive hose clips for 60 to 80mm
outside diameter pipes.
BA393
Heavy-duty stainless steel bracket
secured by a single 'V' bolt. Will clamp to
any pipe with an outside diameter
between 40 and 80mm.