
41
To determine the maximum permissible cable
parameters Ci should be subtracted from the
maximum permitted external capacitance Co
specified by the certificate for the intrinsically safe
interface powering the alarm circuit, such as the
solenoid driver and switch transfer galvanic isolators
shown in Fig 16.
Fig 16 Typical alarm application
10.3.3 Configuration and adjustment
When a BA334G Rate Totaliser is fitted with alarms
the configuration menu is extended as shown in
Fig 17. The alarm functions appear after
clr gtot,
and each alarm may be configured to operate on the
rate or total display.
For simplicity Fig 17 only shows the configurable
functions on the rate option of alarm
AL1
, the total
options is identical except that total alarms do not
have hysteresis. Alarm
AL2
is identical to alarm
AL1
.
The following table summarises each of the alarm
configuration functions and includes a cross
reference to more detailed information. Again only
alarm
AL1
functions are listed.
Display
Summary of function
EnbL
Alarm enable
Enables or disables the alarm without
changing the alarm parameters.
See section 10.3.4
tYPE
Type of alarm
Defines whether the alarm operates
on the rate or total display.
See section 10.3.5
5P1r
Alarm setpoint 1
or
Adjusts the alarm setpoint. The alarm
5P1t
is activated when the rate or total
display equals the setpoint.
Note:
5P1r
is displayed for a rate
alarm and
5P1t
for a total alarm.
See section 10.3.6
HI. LO
Alarm function
Defines whether the alarm has a high
or low function.
See section 10.3.7
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 10.3.8
H5tr
Hysteresis
Adjusts the alarm hysteresis. Only
available on a rate alarm.
See section 10.3.9
dELA
Alarm delay
time
Adjusts the delay between the display
equaling the setpoint and the alarm
output being activated.
See section 10.3.10
S5IL
Alarm silence time
Defines the time that the alarm output
remains in the non-alarm condition
following acceptance of an alarm.
See section 10.3.11
FL5H
Flash display when alarm occurs
When enabled, alternates the rate or
total display between process value
and alarm reference
Al1
or
Al2
when
an alarm output is activated.
See section 10.3.12
AC5P
Access setpoint
Sub-menu that enables direct access
to the alarm setpoints from the
totalisation mode and defines a
separate security code.
See section 10.3.13
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