BEKA BA374C, Manual

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ACCESSORIES
10. IDENTIFICATION AND MOUNTING
10.1 Engraved scale and tag plates
All BA374C indicators are fitted with blank
stainless steel scale and tag plates above and
below the display. These can easily be removed
for engraving, or if requested they can be supplied
engraved with any units of measurement and tag
information. Each plate can accommodate:
1 row of 9 alphanumeric characters 10mm high
or 1 row of 13 alphanumeric characters 7mm high
or 2 rows of 18 alphanumeric characters 5mm high
10.2 Pipe mounting kits
Two pipe mounting kits are available for securing
the BA374C to a horizontal or vertical pipe.
BA392 Stainless steel bracket secured by two
worm drive hose clips. Will clamp to
any vertical or horizontal pipe with
outside diameter between 60 to 80mm.
BA393 Heavy duty stainless steel bracket
secured by a single 'V' bolt. Will clamp
to any vertical or horizontal pipe with an
outside diameter between 40 and
80mm.
10.3 Panel mounting kit
The BA394 panel mounting kit will secure the
BA374C indicator into a panel aperture. All parts
are stainless steel and the kit contains a trim-plate
to conceal the edge of the panel aperture.
11.0 ALARMS
The BA374C can be supplied with two solid state
single pole alarm outputs. Each output may be
programmed as a high or low alarm with a
normally open or a normally closed output. Fig 10
illustrates the conditions available and shows
which are fail safe, i.e. output is in the alarm
condition (open) when the transmitter is not
powered. When an alarm is activated the
indicator display alternates between the measured
value and an alarm identification.
WARNING!
These alarm outputs should not be
used for critical safety applications
such as a shut-down system.
Fig 10 Alarm outputs
Programmable functions for each alarm include
adjustable hysteresis, alarm delay and alarm
accept.
11.1.1 Solid state output
Each alarm has a galvanically isolated single pole
solid state switch output as shown in Fig 11. The
output is polarised and current will only flow in one
direction.
Fig 11 Equivalent circuit of each alarm output
11.1.2 Intrinsic safety
Each alarm output is a separate galvanically
isolated solid state switch with certified output
parameters less than those specified for
simple
apparatus in Clause 5.4 of EN50020. This allows
the alarm terminals 8 & 9 and 10 & 11 to be
connected to any intrinsically safe circuit protected
by a EEx ia IIC certified Zener barrier or galvanic
isolator providing the output parameters of the
circuit do not exceed:
Uo = 30V dc
Io = 280mA
Po = 0.85W
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