Aalborg XFM Digital - Manual (Page 18)

Mode Enable
/Disable
- Allows the user to Enable/Disable Flow Alarm.
Low Alarm - The value of the monitored Flow in % F.S. below
which is considered an alarm condition.
Note: The value of the Low alarm must be less than the
value of the High Alarm.
High Alarm- The value of the monitored Flow in % F.S. above
which is considered an alarm condition.
Note: The value of the High alarm must be more than the
value of the Low Alarm.
Action Delay- The time in seconds that the Flow rate value must remain
above the high limit or below the low limit before an alarm
condition is indicated. Valid settings are in the range of 0
to 3600 seconds.
15
Local maintenance push button is available for manual Totalizer reset on the field.
The maintenance push button is located on the right side of the flow meter inside
the maintenance window above the 15 pin D-connector (see Figure c-1 “XFM
configuration jumpers”).
5.3.4 Flow Alarm Settings.
XFM provides the user with a flexible alarm/warning system that monitors the Gas
Flow for conditions that fall outside configurable limits as well as visual feedback
for the user via the status LED and LCD (only for devices with LCD option) or via
a Relay contact closure.
The flow alarm has several attributes which may be configured by the user via a
digital interface. These attributes control the conditions which cause the alarm to
occur and to specify actions to be taken when the flow rate is outside the speci-
fied conditions.
Note: In order to locally Reset Totalizer, the reset push button must be
pressed during power up sequence. The following sequence is
recommended:
1. Disconnect XFM from the power.
2. Press maintenance push button (do not release).
3. Apply power to the XFM while holding down the maintenance
push button.
4. Release maintenance push button after 6 seconds. For XFM
with optional LCD, when XFM Main Screen appears
(see Figure b-4).