BEKA BA574C, Manual

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ACCESSORIES
9. IDENTIFICATION AND MOUNTING
9.1 Engraved scale and tag plates
All BA574C 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
9.2 Pipe mounting kits
Two pipe mounting kits are available for securing
the BA574C to a horizontal or vertical pipe.
BA392 Stainless steel bracket secured by two
stainless steel worm drive hose clips.
For 60 to 80mm outside diameter pipe.
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.
9.3 Panel mounting kit
The BA394 stainless steel panel mounting kit will
secure a BA574C indicator into a panel aperture,
but it does not seal the joint between the indicator
enclosure and the instrument panel.
10.0 ALARMS
The BA574C 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 8 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 8 Alarm outputs
Programmable functions for each alarm include
setpoint, adjustable hysteresis, alarm delay and
alarm accept.
10.1.1 Solid state output
Each alarm has a galvanically isolated single pole
solid state switch output as shown in Fig 9. The
output is polarised and current will only flow in one
direction.
Fig 9 Equivalent circuit of each alarm output
10.1.2 Programming & adjustment
When an alarm card is added to a BA574C
transmitter the Programme Menu is extended as
shown in Fig 11. The additional functions 'ALr1',
'ALr2' and 'AcSP' appear between 'Cond' and
'COde' in the Programme Menu. For simplicity Fig
11 only shows the functions available on alarm 1,
but alarm 2 has identical facilities.
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