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10.4.3 Alarm configuration
Alarm configuration may be performed via the
HART
digital communication, see the BA47XBA67X
Indicating Temperature Transmitter HART
Interface
Guide which may be downloaded from
www.beka.co.uk/manuals. Alternatively configuration
may be performed using the configuration menu
which is accessed via the four push buttons located
behind the instrument switch cover, see Fig 5. When
frequent adjustments are required the transmitter can
be supplied with a keypad mounted on the outside of
this cover.
When a BA474ND indicating temperature transmitter
is supplied with optional alarms the conditioning
menu is extended as shown in Fig 12. The
additional alarm functions appear between 'bAr' and
'CodE' in the configuration menu. For simplicity
Fig 12 only shows the additional sub-functions for
alarm 1, but alarm 2 has identical sub-functions.
The following table summarises each of the alarm
configuration functions and includes a cross
reference to more detailed information. Again only
the functions for alarm 1 are listed, but alarm 2 has
identical functions.
Summary of programmable alarm functions
Display
Description of function
‘ALr1’ Alarm
1
‘ALr2’
Alarm 2
The two functions
e
ach contain seven
identical sub-functions, one set for
configuration alarm 1 and the other for
configuration alarm 2.
See section 10.4.4 and Fig 12.
'EnbL'
Alarm enable
Enables or disables the alarm function
without changing the alarm parameters.
See section 10.4.5
'SP1'
Alarm setpoint 1
Adjusts the alarm setpoint. The alarm is
activated when the indicator display
equals the setpoint.
See section 10.4.6
'Hi.Lo'
Alarm function
Defines whether the alarm has a high or
low function.
See section 10.4.7
'no.nC'
Normally open or normally closed
output
Determines whether the single pole alarm
output is open or closed in the non-alarm
condition.
See section 10.4.8
'HStr'
Hysteresis
Adjusts the alarm hysteresis.
See section 10.4.9
'dELA'
Alarm delay
time
Adjusts the delay between the display
equalling the setpoint and the alarm
output being activated.
See section 10.4.10
'SiL'
Alarm silence time
Defines the time that the alarm output
remains in the non-alarm condition
following acceptance of an alarm.
See section 10.4.11
'ACSP'
Access setpoint
Enables direct access to the alarm
setpoints from the transmitter operational
mode i.e. when it is displaying
temperature. Access may be protected
by a separate security code.
See section 10.4.12