8. ACCESSORIES
8.1 Scale card
The BA567E Counter has a window on the right
hand side of the display through which a scale card
showing the units of measurement such as metres is
visible. New Counters are fitted with a scale card
showing the units of measurement specified when
the instrument was ordered, if the units are not
specified a blank scale card will be fitted. A pack of
scale cards pre-printed with common units of
measurement is available as an accessory. These
can easily be fitted on-site to the Counter without
opening the instrument enclosure or removing it from
the panel, See section 4.4 of this instruction
manual.
Custom scale cards for applications requiring less
common units of measurement are also available.
8.2 Tag information
New Counters can be supplied with a tag number or
application information printed onto the rear panel
adjacent to the terminals. This information is not
visible from the front of the instrument after
installation.
8.3 Alarms
Only one of the following accessories may be fitted:
dual alarms, or an isolated pulse output or an isolated
4/20mA output.
The BA567E Counter can be supplied with factory
fitted isolated, dual solid state single pole alarm
outputs that may be independently configured as
high or low, rate or total alarms with normally open
or normally closed outputs.
Configurable functions for each alarm include
adjustable setpoint, alarm delay time and alarm
silence time. Hysteresis may be applied to rate
alarms.
WARNING
These alarm outputs should not be used
for critical safety applications such as a
shut down system.
When the BA567E power supply is turned off or
disconnected, alarm outputs will open irrespective of
whether normally open or normally closed outputs
have been selected. When designing a system an
open output should therefore be chosen for the
alarm condition.
Alarm annunciators on the instrument display
indicate the status of each alarm. If an alarm delay
or silence time has been selected the annunciator
will flash during the delay or silence period.
The BA567E internal counters are up-dated and
compared with the alarm setpoint twice per second,
irrespective of the display update time selected.
This may result in an alarm being delayed for up to
half a second after the rate or total has exceeded the
setpoint.
8.3.1 Solid state output
Each alarm has a galvanically isolated single pole
solid state switch output as shown in Fig 8. The
outputs are polarised and current will only flow in
one direction. Terminals A1 and A3 should be
connected to the positive side of the supply.
Ron
=
less than 5
+ 0.7V
Roff
=
greater than 1M
Note:
Because of the series protection diode some
test meters may not detect a closed alarm
output
Fig 8 Equivalent circuit of each alarm output
The solid state output of each alarm may be used to
switch any circuit with parameters equal or less than:
V
=
30V
I
=
200mA
23
Summary of Contents for BA567E
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